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Wang P, Xia W, Liu N, Pei W, Zhou S, Tu Y, Zhao J. p-block germanenes as a promising electrocatalysts for the oxygen reduction reaction. J Chem Phys 2024; 160:234705. [PMID: 38884409 DOI: 10.1063/5.0211907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Accepted: 05/24/2024] [Indexed: 06/18/2024] Open
Abstract
The oxygen reduction reaction (ORR), a pivotal process in hydrogen fuel cells crucial for enhancing fuel cell performance through suitable catalysts, remains a challenging aspect of development. This study explores the catalytic potential of germanene on Al (111), taking advantage of the successful preparation of stable reconstructed germanene layers on Al (111) and the excellent catalytic performance exhibited by germanium-based nanomaterials. Through first-principles calculations, we demonstrate that the O2 molecule can be effectively activated on both freestanding and supported germanene nanosheets, featuring kinetic barriers of 0.40 and 0.04 eV, respectively. The presence of the Al substrate not only significantly enhances the stability of the reconstructed germanene but also preserves its exceptional ORR catalytic performance. These theoretical findings offer crucial insights into the substrate-mediated modulation of germanene stability and catalytic efficiency, paving the way for the design of stable and efficient ORR catalysts for future applications.
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Affiliation(s)
| | - Weizhi Xia
- College of Physics Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Nanshu Liu
- Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
| | - Wei Pei
- College of Physics Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Si Zhou
- School of Physics, South China Normal University, Guangzhou 510631, China
- Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou, 510006 China
- Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006, China
- Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Frontier Research Institute for Physics, South China Normal University, Guangzhou 510006, China
| | - Yusong Tu
- College of Physics Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Jijun Zhao
- School of Physics, South China Normal University, Guangzhou 510631, China
- Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou, 510006 China
- Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006, China
- Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Frontier Research Institute for Physics, South China Normal University, Guangzhou 510006, China
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2
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Kala J, Anjum U, Mani BK, Haider MA. Controlling surface cation segregation in a double perovskite for oxygen anion transport in high temperature energy conversion devices. Phys Chem Chem Phys 2023; 25:22022-22031. [PMID: 37555332 DOI: 10.1039/d3cp00827d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
Double perovskite materials have shown promising applications as an electrode in solid oxide fuel cells and Li-air batteries for oxygen reduction, evolution, and transport. However, degradation of the material due to cation migration to the surface, forming secondary phases, poses an existential bottleneck in materials development. Herein, a theoretical approach combining density functional theory and molecular dynamics simulations is presented to study the Ba-cation segregation in a double perovskite NdBaCo2O5+δ. Solutions to circumvent segregation at the molecular level are presented in two different forms by applying strain and introducing dopants in the structure. On applying compressive strain or Ca as a dopant in the NBCO structure, segregation is estimated to reduce significantly. A more direct way of estimating cation segregation is proposed in MD simulations, wherein the counting of the cations migrating from the sub-surface layers to the surface provided a reliable theoretical assessment of the level of cation segregation.
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Affiliation(s)
- Jyotsana Kala
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, Delhi, India.
| | - Uzma Anjum
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, Delhi, India.
| | - B K Mani
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, Delhi, India.
| | - M Ali Haider
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, Delhi, India.
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3
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Wu T, Li X, Weng CH, Ding F, Tan F, Duan R. Highly efficient LaMO 3 (M = Co, Fe) perovskites catalyzed Fenton's reaction for degradation of direct blue 86. ENVIRONMENTAL RESEARCH 2023; 227:115756. [PMID: 36966992 DOI: 10.1016/j.envres.2023.115756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 03/12/2023] [Accepted: 03/22/2023] [Indexed: 05/08/2023]
Abstract
Perovskite-structured catalysts LaMO3 (M = Co, Fe) were successfully synthesized and attempted to catalyze hydrogen peroxide (H2O2) for the degradation of Direct Blue 86 (DB86), a carcinogenic phthalocyanine dye. The heterogeneous Fenton-like reaction revealed that the oxidative power of the LaCoO3-catalyzed H2O2 (LaCoO3/H2O2) process was higher than that of LaFeO3/H2O2. When LaCoO3 was calcined at 750 °C for 5 h, 100 mg/L of DB86 could be completely degraded within 5 min via LaCoO3/H2O2 system under H2O2 0.0979 mol/L, initial pH 3.0, LaCoO3 0.4 g/L, and 25 °C. The oxidative LaCoO3/H2O2 system has a low activation energy (14.68 kJ/mol) for DB86 degradation, indicating that it is a fast reaction process with highly favorable at high reaction temperatures. For the first time, a cyclic reaction mechanism of catalytic LaCoO3/H2O2 system was proposed based on the evidence of coexisting CoII and CoIII on the LaCoO3 surface and the presence of HO• radicals (major), O2•- radicals (minor), and 1O2 (minor). LaCoO3 perovskite catalyst was reusable and still maintained reactive with a satisfactory degradation efficiency within 5 min even after five consecutive uses. This study shows that the as-prepared LaCoO3 is a highly efficient catalyst for phthalocyanine dye degradation.
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Affiliation(s)
- Tengyan Wu
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan, 417000, China
| | - Xiang Li
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan, 417000, China
| | - Chih-Huang Weng
- Department of Civil Engineering, I-Shou University, Kaohsiung City, 84008, Taiwan.
| | - Feng Ding
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan, 417000, China.
| | - Fengliang Tan
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan, 417000, China
| | - Renyan Duan
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan, 417000, China
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Ichibha T, Saritas K, Krogel JT, Luo Y, Kent PRC, Reboredo FA. Existence of La-site antisite defects in [Formula: see text] ([Formula: see text], Fe, and Co) predicted with many-body diffusion quantum Monte Carlo. Sci Rep 2023; 13:6703. [PMID: 37185382 PMCID: PMC10130183 DOI: 10.1038/s41598-023-33578-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 04/14/2023] [Indexed: 05/17/2023] Open
Abstract
The properties of [Formula: see text] (M: 3d transition metal) perovskite crystals are significantly dependent on point defects, whether introduced accidentally or intentionally. The most studied defects in La-based perovskites are the oxygen vacancies and doping impurities on the La and M sites. Here, we identify that intrinsic antisite defects, the replacement of La by the transition metal, M, can be formed under M-rich and O-poor growth conditions, based on results of an accurate many-body ab initio approach. Our fixed-node diffusion Monte Carlo (FNDMC) calculations of [Formula: see text] ([Formula: see text], Fe, and Co) find that such antisite defects can have low formation energies and are magnetized. Complementary density functional theory (DFT)-based calculations show that Mn antisite defects in [Formula: see text] may cause the p-type electronic conductivity. These features could affect spintronics, redox catalysis, and other broad applications. Our bulk validation studies establish that FNDMC reproduces the antiferromagnetic state of [Formula: see text], whereas DFT with PBE (Perdew-Burke-Ernzerhof), SCAN (strongly constrained and appropriately normed), and the LDA+U (local density approximation with Coulomb U) functionals all favor ferromagnetic states, at variance with experiment.
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Affiliation(s)
- Tom Ichibha
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
- School of Information Science, Japan Advanced Institute of Science and Technology, Asahidai 1-1, Nomi, Ishikawa 923-1292 Japan
| | - Kayahan Saritas
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
| | - Jaron T. Krogel
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
| | - Ye Luo
- Computational Sciences Division, Argonne National Laboratory, Argonne, IL 60439 USA
| | - Paul R. C. Kent
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
| | - Fernando A. Reboredo
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
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5
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Tsyshevsky RV, Rashkeev SN, Kuklja MM. Control of Explosive Chemical Reactions by Optical Excitations: Defect-Induced Decomposition of Trinitrotoluene at Metal Oxide Surfaces. Molecules 2023; 28:molecules28030953. [PMID: 36770620 PMCID: PMC9920724 DOI: 10.3390/molecules28030953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/09/2023] [Accepted: 01/11/2023] [Indexed: 01/19/2023] Open
Abstract
Interfaces formed by high energy density materials and metal oxides present intriguing new opportunities for a large set of novel applications that depend on the control of the energy release and initiation of explosive chemical reactions. We studied the role of structural defects at a MgO surface in the modification of electronic and optical properties of the energetic material TNT (2-methyl-1,3,5-trinitrobenzene, also known as trinitrotoluene, C7H5N3O6) deposited at the surface. Using density functional theory (DFT)-based solid-state periodic calculations with hybrid density functionals, we show how the control of chemical explosive reactions can be achieved by tuning the electronic structure of energetic compound at an interface with oxides. The presence of defects at the oxide surface, such as steps, kinks, corners, and oxygen vacancies, significantly affects interfacial properties and modifies electronic spectra and charge transfer dynamics between the oxide surface and adsorbed energetic material. As a result, the electronic and optical properties of trinitrotoluene, mixed with an inorganic material (thus forming a composite), can be manipulated with high precision by interactions between TNT and the inorganic material at composite interfaces, namely, by charge transfer and band alignment. Also, the electron charge transfer between TNT and MgO surface reduces the decomposition barriers of the energetic material. In particular, it is shown that surface structural defects are critically important in the photodecomposition processes. These results open new possibilities for the rather precise control over the decomposition initiation mechanisms in energetic materials by optical excitations.
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6
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Solid-State Electrochemistry and Solid Oxide Fuel Cells: Status and Future Prospects. ELECTROCHEM ENERGY R 2022. [DOI: 10.1007/s41918-022-00160-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
AbstractSolid-state electrochemistry (SSE) is an interdisciplinary field bridging electrochemistry and solid-state ionics and deals primarily with the properties of solids that conduct ions in the case of ionic conducting solid electrolytes and electrons and/or electron holes in the case of mixed ionic and electronic conducting materials. However, in solid-state devices such as solid oxide fuel cells (SOFCs), there are unique electrochemical features due to the high operating temperature (600–1 000 °C) and solid electrolytes and electrodes. The solid-to-solid contact at the electrode/electrolyte interface is one of the most distinguished features of SOFCs and is one of the fundamental reasons for the occurance of most importance phenomena such as shift of the equipotential lines, the constriction effect, polarization-induced interface formation, etc. in SOFCs. The restriction in placing the reference electrode in solid electrolyte cells further complicates the SSE in SOFCs. In addition, the migration species at the solid electrode/electrolyte interface is oxygen ions, while in the case of the liquid electrolyte system, the migration species is electrons. The increased knowledge and understanding of SSE phenomena have guided the development of SOFC technologies in the last 30–40 years, but thus far, no up-to-date reviews on this important topic have appeared. The purpose of the current article is to review and update the progress and achievements in the SSE in SOFCs, largely based on the author’s past few decades of research and understanding in the field, and to serve as an introduction to the basics of the SSE in solid electrolyte devices such as SOFCs.
Graphical abstract
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7
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Guo R, Chen Y, Yang Y, Shang J, Cheng X. Efficient degradation of sulfacetamide by CoFe PBAs and PBA@PVDF composite membrane activating peroxymonosulfate. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.107837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Majewski AJ, Khodimchuk A, Zakharov D, Porotnikova N, Ananyev M, Johnson ID, Darr JA, Slater PR, Steinberger-Wilckens R. Oxygen surface exchange properties and electrochemical activity of lanthanum nickelates. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Jia M, Fan Y, Sun Z, Hu X. ZrO 2 supported perovskite activation of peroxymonosulfate for sulfamethoxazole removal from aqueous solution. CHEMOSPHERE 2022; 298:134339. [PMID: 35304221 DOI: 10.1016/j.chemosphere.2022.134339] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 03/03/2022] [Accepted: 03/14/2022] [Indexed: 06/14/2023]
Abstract
In this study, A- and B-site doped perovskite La0.5Sr0.5Co0.8Ni0.2O3 (LSCN) was prepared by sol-gel method. On this basis, ZrO2 supported LSCN used to maintain high catalytic activity while inhibit the leaching of toxic Co ions. Compared with the non-doped LaCoO3, the ZrO2@La0.5Sr0.5Co0.8Ni0.2O3 (Z@LSCN82)/PMS system could almost completely degrade SMX in 30 min. In addition, the leaching amount of Co ions was only 0.303 mg L-1. Free radical quenching experiments and electron paramagnetic resonance experiments proved that active species SO4•-, •OH and 1O2 existed in the Z@LSCN82/PMS system, and SO4•- played a major role. Besides, the catalyst had high efficiency for SMX degradation in a wide pH range. In addition, co-existing anions in water such as HPO4- and Cl- also showed slight inhibition of the system. It was indicated that the Z@LSCN82/PMS system had huge potential applications for practical wastewater treatment.
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Affiliation(s)
- Muhan Jia
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Yan Fan
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Zhirong Sun
- College of Environmental & Energy Engineering, Beijing University of Technology, Beijing, 100124, PR China
| | - Xiang Hu
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China.
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10
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Tapia-P J, Cao Y, Gallego J, Osorio-Guillén JM, Morgan D, Espinal JF. CO Oxidation Catalytic Effects of Intrinsic Surface Defects in Rhombohedral LaMnO 3. Chemphyschem 2022; 23:e202200152. [PMID: 35481907 DOI: 10.1002/cphc.202200152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 04/01/2022] [Indexed: 11/08/2022]
Abstract
There is an ongoing effort to replace rare and expensive noble-element catalysts with more abundant and less expensive transition metal oxides. With this goal in mind, the intrinsic defects of a rhombohedral perovskite-like structure of LaMnO3 and their implications on CO catalytic properties were studied. Surface thermodynamic stability as a function of pressure (P) and temperature (T) were calculated to find the most stable surface under reaction conditions (P=0.2 atm, T=323 K to 673 K). Crystallographic planes (100), (111), (110), and (211) were evaluated and it was found that (110) with MnO2 termination was the most stable under reaction conditions. Adsorption energies of O2 and CO on (110) as well as the effect of intrinsic defects such as Mn and O vacancies were also calculated. It was found that O vacancies favor the interaction of CO on the surface, whereas Mn vacancies can favor the formation of carbonate species.
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Affiliation(s)
- Juan Tapia-P
- Química de Recursos Energéticos y Medio Ambiente, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, 050010, Medellín, Colombia
| | - Yipeng Cao
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Jaime Gallego
- Química de Recursos Energéticos y Medio Ambiente, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, 050010, Medellín, Colombia
| | - Jorge M Osorio-Guillén
- Grupo de Estado Sólido, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, 050010, Medellín, Colombia
| | - Dane Morgan
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Juan F Espinal
- Química de Recursos Energéticos y Medio Ambiente, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, 050010, Medellín, Colombia
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11
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Qi H, Zhang T, Cheng M, Liu D, Tu B. Rational design of the self-assembled BaCo1-xZrxO3-δ (x = 0.8–0.2) nanocomposites as the promising low/intermediate-temperature solid oxide fuel cell cathodes. Ann Ital Chir 2022. [DOI: 10.1016/j.jeurceramsoc.2021.11.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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12
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Han N, Shen Z, Zhao X, Chen R, Thakur VK. Perovskite oxides for oxygen transport: Chemistry and material horizons. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:151213. [PMID: 34715221 DOI: 10.1016/j.scitotenv.2021.151213] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 10/17/2021] [Accepted: 10/21/2021] [Indexed: 06/13/2023]
Abstract
Oxygen permeable membrane, which has the advantages of high separation selectivity, low energy consumption and simple process in oxygen separation, can be used in the fields of environment and energy, such as pure oxygen preparation, fuel cell, oxygen-enriched combustion and chemical reactor for methane catalytic conversion (e.g. partial oxidation of methane, carbon dioxide reforming with methane). New materials and technological development are needed to achieve this target for GHG reformation. In this direction, mixed ionic-electronic conducting (MIEC) oxides based on perovskite oxides are one of the prominent materials for oxygen transport at high temperatures. These compounds were created into solid ceramic membranes with considerable electronic and oxygen ionic conductivity. As a result of the differential partial pressure of oxygen across the membrane, this process enables the ionic transfer of oxygen from the air, providing the driving force for oxygen ion transport. Notably, over the last 40 years, the defect theory has been applied to a wide range of MIEC materials, providing insight into electronic and ionic transport, widely applied to designing catalysts for wastewater treatment and gas purification. However, a critical review by in-depth analysis from the material side on perovskite oxides for oxygen transport is needed. This work evaluates the research community's significant and relevant contributions in the perovskite oxides for gas separation domain over the previous four decades in conjunction with theoretical concepts, which would give rise to the fundamental understanding of the impact of various transitional metal elements on oxygen transport performance and stability in a different atmosphere.
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Affiliation(s)
- Ning Han
- Department of Materials Engineering, KU Leuven, Leuven 3001, Belgium
| | - Zhangfeng Shen
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China.
| | - Xiaolin Zhao
- Shenzhen Automotive Research Institute, Beijing Institute of Technology, Shenzhen 518118, Guangdong, China
| | - Ruofei Chen
- School of Energy Science and Engineering, Central South University, Changsha 410083, Hunan, China
| | - Vijay Kumar Thakur
- Biorefining and Advanced Materials Research Center, SRUC, Edinburgh EH9 3JG, United Kingdom; Department of Mechanical Engineering, School of Engineering, Shiv Nadar University, Uttar Pradesh 201314, India; School of Engineering, University of Petroleum & Energy Studies (UPES), Dehradun 248007, Uttarakhand, India.
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13
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Baiutti F, Chiabrera F, Diercks D, Cavallaro A, Yedra L, López-Conesa L, Estradé S, Peiró F, Morata A, Aguadero A, Tarancón A. Direct Measurement of Oxygen Mass Transport at the Nanoscale. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2105622. [PMID: 34611954 DOI: 10.1002/adma.202105622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/24/2021] [Indexed: 06/13/2023]
Abstract
Tuning oxygen mass transport properties at the nanoscale offers a promising approach for developing high performing energy materials. A number of strategies for engineering interfaces with enhanced oxygen diffusivity and surface exchange have been proposed. However, the origin and the magnitude of such local effects remain largely undisclosed to date due to the lack of direct measurement tools with sufficient resolution. In this work, atom probe tomography with sub-nanometer resolution is used to study oxygen mass transport on oxygen-isotope exchanged thin films of lanthanum chromite. A direct 3D visualization of nanoscaled highly conducting oxygen incorporation pathways along grain boundaries, with reliable quantification of the oxygen kinetic parameters and correlative link to local chemistries, is presented. Combined with finite element simulations of the exact nanostructure, isotope exchange-atom probe tomography allowed quantifying an enhancement in the grain boundary oxygen diffusivity and in the surface exchange coefficient of lanthanum chromite of about 4 and 3 orders of magnitude, respectively, compared to the bulk. This remarkable increase of the oxygen kinetics in an interface-dominated material is unambiguously attributed to grain boundary conduction highways thanks to the use of a powerful technique that can be straightforwardly extended to the study of currently inaccessible multiple nanoscale mass transport phenomena.
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Affiliation(s)
- Federico Baiutti
- Department of Advanced Materials for Energy, Catalonia Institute for Energy Research (IREC), Jardin de les Dones de Negre 1, Sant Adrià de Besòs (Barcelona), 08930, Spain
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, Ljubljana, SI-1000, Slovenia
| | - Francesco Chiabrera
- Department of Advanced Materials for Energy, Catalonia Institute for Energy Research (IREC), Jardin de les Dones de Negre 1, Sant Adrià de Besòs (Barcelona), 08930, Spain
- Department of Energy Conversion and Storage, Functional Oxides group, Technical University of Denmark, Fysikvej, 310, Kongens Lyngby, 233 2800, Denmark
| | - David Diercks
- Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO, 80401, USA
| | - Andrea Cavallaro
- Department of Materials, Imperial College London, Prince Consort Road, London, SW7 2BP, UK
| | - Lluís Yedra
- Laboratory of Electron Nanoscopies (LENS), Micro-Nanotechnology and Nanoscopies for electrophotonic Devices (MIND), Department of Electronics and Biomedical Engineering and Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, C/Martí i Franquès 1, Barcelona, 08028, Spain
| | - Lluís López-Conesa
- Laboratory of Electron Nanoscopies (LENS), Micro-Nanotechnology and Nanoscopies for electrophotonic Devices (MIND), Department of Electronics and Biomedical Engineering and Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, C/Martí i Franquès 1, Barcelona, 08028, Spain
- TEM-MAT Unit, Scientific and Technological Centers of the University of Barcelona (CCiTUB), C/Lluís Solé i Sabaris 1, Barcelona, 08028, Spain
| | - Sonia Estradé
- Laboratory of Electron Nanoscopies (LENS), Micro-Nanotechnology and Nanoscopies for electrophotonic Devices (MIND), Department of Electronics and Biomedical Engineering and Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, C/Martí i Franquès 1, Barcelona, 08028, Spain
| | - Francesca Peiró
- Laboratory of Electron Nanoscopies (LENS), Micro-Nanotechnology and Nanoscopies for electrophotonic Devices (MIND), Department of Electronics and Biomedical Engineering and Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, C/Martí i Franquès 1, Barcelona, 08028, Spain
| | - Alex Morata
- Department of Advanced Materials for Energy, Catalonia Institute for Energy Research (IREC), Jardin de les Dones de Negre 1, Sant Adrià de Besòs (Barcelona), 08930, Spain
| | - Ainara Aguadero
- Department of Materials, Imperial College London, Prince Consort Road, London, SW7 2BP, UK
| | - Albert Tarancón
- Department of Advanced Materials for Energy, Catalonia Institute for Energy Research (IREC), Jardin de les Dones de Negre 1, Sant Adrià de Besòs (Barcelona), 08930, Spain
- ICREA, Passeig Lluís Companys 23, Barcelona, 08010, Spain
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14
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Zhou C, Zhu L, Deng L, Zhang H, Zeng H, Shi Z. Efficient activation of peroxymonosulfate on CuS@MIL-101(Fe) spheres featured with abundant sulfur vacancies for coumarin degradation: Performance and mechanisms. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119404] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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15
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Zhu J, Zhu Y, Zhou W. Cu-doped Ni-LDH with abundant oxygen vacancies for enhanced methyl 4-hydroxybenzoate degradation via peroxymonosulfate activation: key role of superoxide radicals. J Colloid Interface Sci 2021; 610:504-517. [PMID: 34838311 DOI: 10.1016/j.jcis.2021.11.097] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 11/08/2021] [Accepted: 11/17/2021] [Indexed: 01/19/2023]
Abstract
Oxygen vacancies (OVs) were introduced into Ni-based layered double hydroxides (LDHs) through Cu doping, and the catalytic performance of the resulting NixCu-LDHs were investigated for peroxymonosulfate (PMS) activation and methyl 4-hydroxybenzoate (MeP) degradation. Compared with that of Ni-LDH, the catalytic performance of NixCu-LDHs were significantly enhanced and increased with increasing OV content in the catalysts, indicating that Cu doping introduced OVs into NixCu-LDHs and greatly improved their catalytic activity with PMS. Quenching experiments and EPR analyses confirmed that oxidation processes dominated by superoxide radicals (O2•-) and singlet oxygen (1O2), rather than sulfate radicals (SO4•-) or hydroxyl radicals (•OH) used by traditional LDH catalysts, were responsible for MeP degradation by Ni15Cu-LDHs. In addition, quenching experiments with different systems showed the fate of reduced SO4•-and •OH, and demonstrated that O2•- and 1O2 concentrations grew with increasing OV content, confirming that the presence of OVs affected the process of PMS activation. Notably, O2•- mainly originated from adsorbed oxygen or dissolved oxygen (DO) by acquiring electrons from OVs in Ni15Cu-LDHs, since OVs possess abundant localized electrons. Consequently, an OV-mediated oxidative mechanism was proposed for Ni15Cu-LDHs/PMS. This study provides new clues for enhancing the catalytic performance of LDH catalysts by introducing OVs via metal doping in PMS-based AOPs systems.
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Affiliation(s)
- Jingyi Zhu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Yixin Zhu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Wenjun Zhou
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Zhejiang Ecological Civilization Academy, Anji, Zhejiang 313300, China; The Key Laboratory of Organic Pollution Process and Control, Zhejiang Province, Hangzhou, Zhejiang 310058, China.
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16
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Chen H, Lim C, Zhou M, He Z, Sun X, Li X, Ye Y, Tan T, Zhang H, Yang C, Han JW, Chen Y. Activating Lattice Oxygen in Perovskite Oxide by B-Site Cation Doping for Modulated Stability and Activity at Elevated Temperatures. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2102713. [PMID: 34658158 PMCID: PMC8596113 DOI: 10.1002/advs.202102713] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/02/2021] [Indexed: 05/07/2023]
Abstract
Doping perovskite oxide with different cations is used to improve its electro-catalytic performance for various energy and environment devices. In this work, an activated lattice oxygen activity in Pr0.4 Sr0.6 Cox Fe0.9- x Nb0.1 O3- δ (PSCxFN, x = 0, 0.2, 0.7) thin film model system by B-site cation doping is reported. As Co doping level increases, PSCxFN thin films exhibit higher concentration of oxygen vacancies ( V o • • ) as revealed by X-ray diffraction and synchrotron-based X-ray photoelectron spectroscopy. Density functional theory calculation results suggest that Co doping leads to more distortion in FeO octahedra and weaker metaloxygen bonds caused by the increase of antibonding state, thereby lowering V o • • formation energy. As a consequence, PSCxFN thin film with higher Co-doping level presents larger amount of exsolved particles on the surface. Both the facilitated V o • • formation and B-site cation exsolution lead to the enhanced hydrogen oxidation reaction (HOR) activity. Excessive Co doping until 70%, nevertheless, results in partial decomposition of thin film and degrades the stability. Pr0.4 Sr0.6 (Co0.2 Fe0.7 Nb0.1 )O3 with moderate Co doping level displays both good HOR activity and stability. This work clarifies the critical role of B-site cation doping in determining the V o • • formation process, the surface activity, and structure stability of perovskite oxides.
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Affiliation(s)
- Huijun Chen
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Chaesung Lim
- Department of Chemical EngineeringPohang University of Science and TechnologyPohangGyeongbuk37673Republic of Korea
| | - Mengzhen Zhou
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Zuyun He
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Xiang Sun
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Xiaobao Li
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
| | - Yongjian Ye
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Ting Tan
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Hui Zhang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
| | - Chenghao Yang
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
| | - Jeong Woo Han
- Department of Chemical EngineeringPohang University of Science and TechnologyPohangGyeongbuk37673Republic of Korea
| | - Yan Chen
- School of Environment and EnergyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510006China
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17
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Zhou M, Liu J, Ye Y, Sun X, Chen H, Zhou D, Yin Y, Zhang N, Ling Y, Ciucci F, Chen Y. Enhancing the Intrinsic Activity and Stability of Perovskite Cobaltite at Elevated Temperature Through Surface Stress. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2104144. [PMID: 34605170 DOI: 10.1002/smll.202104144] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/27/2021] [Indexed: 06/13/2023]
Abstract
Perovskite-based oxides attract great attention as catalysts for energy and environmental devices. Nanostructure engineering is demonstrated as an effective approach for improving the catalytic activity of the materials. The mechanism for the enhancement, nevertheless, is still not fully understood. In this study, it is demonstrated that compressive strain can be introduced into freestanding perovskite cobaltite La0.8 Sr0.2 CoO3- δ (LSC) nanofibers with sufficient small size. Crystal structure analysis suggests that the LSC fiber is characterized by compressive strain along the ab plane and less distorted CoO6 octahedron compared to the bulk powder sample. Accompanied by such structural changes, the nanofiber shows significantly higher oxygen reduction reaction (ORR) activity and better stability at elevated temperature, which is attributed to the higher oxygen vacancy concentration and suppressed Sr segregation in the LSC nanofibers. First-principle calculations further suggest that the compressive strain in LSC nanofibers effectively shortens the distance between the Co 3d and O 2p band center and lowers the oxygen vacancy formation energy. The results clarify the critical role of surface stress in determining the intrinsic activity of perovskite oxide nanomaterials. The results of this work can help guide the design of highly active and durable perovskite catalysts via nanostructure engineering.
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Affiliation(s)
- Mengzhen Zhou
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
| | - Jiapeng Liu
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, 999077, China
| | - Yongjian Ye
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
| | - Xiang Sun
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
| | - Huijun Chen
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
| | - Deng Zhou
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Yimei Yin
- Institute of Electrochemical & Energy Technology, Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Nian Zhang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Yihan Ling
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, PR China
| | - Francesco Ciucci
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, 999077, China
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong, 999077, China
| | - Yan Chen
- State Key Laboratory of Pulp and Paper Engineering, School of Environment and Energy, South China University of Technology, Guangzhou, 510000, China
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18
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Porotnikova N, Farlenkov A, Naumov S, Vlasov M, Khodimchuk A, Fetisov A, Ananyev M. Effect of grain boundaries in La 0.84Sr 0.16CoO 3-δ on oxygen diffusivity and surface exchange kinetics. Phys Chem Chem Phys 2021; 23:11272-11286. [PMID: 33972961 DOI: 10.1039/d1cp01099a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The single crystal and polycrystalline specimens of La0.84Sr0.16CoO3-δ oxide were synthesized and characterized by X-ray powder diffraction analysis, energy dispersive X-ray microanalysis, the electron backscatter diffraction technique, and X-ray photoelectron spectroscopy. A thin slab was prepared from the grown single crystal with its surface corresponding to the (110) plane. The kinetics of the oxygen exchange between the gas phase and a single crystal and a polycrystalline specimen was studied by means of 16O/18O oxygen isotope exchange at T = 750-850 °C and PO2 = 5.3 × 10-3-2.2 × 10-2 atm. Temperature dependencies of the oxygen heterogeneous exchange rate, the oxygen dissociative adsorption and incorporation rates, and oxygen diffusion coefficients were obtained. The relationship between the crystallographic orientation of oxides and the kinetic parameters of oxides has been established. Correlations between the surface state and the rates of individual stages of oxygen exchange as well as oxygen diffusion pathways in the single crystal compared with those in the polycrystalline specimen are considered.
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Affiliation(s)
- Natalia Porotnikova
- Institute of High Temperature Electrochemistry, UB RAS, Ekaterinburg, Russia.
| | - Andrei Farlenkov
- Ural Federal University named after the First President of Russia B.N. Yeltsin, Ekaterinburg, Russia
| | - Sergey Naumov
- Institute of Metal Physics, UB RAS, Ekaterinburg, Russia
| | - Maxim Vlasov
- Institute of High Temperature Electrochemistry, UB RAS, Ekaterinburg, Russia.
| | - Anna Khodimchuk
- Institute of High Temperature Electrochemistry, UB RAS, Ekaterinburg, Russia.
| | | | - Maxim Ananyev
- Ural Federal University named after the First President of Russia B.N. Yeltsin, Ekaterinburg, Russia
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19
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Yan H, Shen Q, Sun Y, Zhao S, Lu R, Gong M, Liu Y, Zhou X, Jin X, Feng X, Chen X, Chen D, Yang C. Tailoring Facets of α-Mn 2O 3 Microcrystalline Catalysts for Enhanced Selective Oxidation of Glycerol to Glycolic Acid. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01566] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Hao Yan
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Qi Shen
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Yinghao Sun
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Siming Zhao
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Ruilong Lu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Mengcong Gong
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Yibin Liu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Xin Zhou
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Xin Jin
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Xiang Feng
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Xiaobo Chen
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - De Chen
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Chaohe Yang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
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20
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A high-entropy manganite in an ordered nanocomposite for long-term application in solid oxide cells. Nat Commun 2021; 12:2660. [PMID: 33976209 PMCID: PMC8113253 DOI: 10.1038/s41467-021-22916-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 03/29/2021] [Indexed: 02/03/2023] Open
Abstract
The implementation of nano-engineered composite oxides opens up the way towards the development of a novel class of functional materials with enhanced electrochemical properties. Here we report on the realization of vertically aligned nanocomposites of lanthanum strontium manganite and doped ceria with straight applicability as functional layers in high-temperature energy conversion devices. By a detailed analysis using complementary state-of-the-art techniques, which include atom-probe tomography combined with oxygen isotopic exchange, we assess the local structural and electrochemical functionalities and we allow direct observation of local fast oxygen diffusion pathways. The resulting ordered mesostructure, which is characterized by a coherent, dense array of vertical interfaces, shows high electrochemically activity and suppressed dopant segregation. The latter is ascribed to spontaneous cationic intermixing enabling lattice stabilization, according to density functional theory calculations. This work highlights the relevance of local disorder and long-range arrangements for functional oxides nano-engineering and introduces an advanced method for the local analysis of mass transport phenomena.
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21
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Ananyev MV, Porotnikova NM, Eremin VA, Kurumchin EK. Interaction of O 2 with LSM–YSZ Composite Materials and Oxygen Spillover Effect. ACS Catal 2021. [DOI: 10.1021/acscatal.0c04558] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Maxim V. Ananyev
- Ural Federal University Named After the First President of Russia B. N. Yeltsin, 620002 Ekaterinburg, Russia
| | - Natalia M. Porotnikova
- Institute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, 620990 Ekaterinburg, Russia
| | - Vadim A. Eremin
- Institute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, 620990 Ekaterinburg, Russia
| | - Edhem Kh. Kurumchin
- Institute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, 620990 Ekaterinburg, Russia
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22
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Bliem R, Kim D, Wang J, Crumlin EJ, Yildiz B. Hf Deposition Stabilizes the Surface Chemistry of Perovskite Manganite Oxide. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:3346-3354. [PMID: 33815648 PMCID: PMC8016110 DOI: 10.1021/acs.jpcc.0c09707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 01/27/2021] [Indexed: 06/12/2023]
Abstract
Stable composition and catalytic activity of surfaces are among the key requirements for materials employed in energy storage and conversion devices, such as solid oxide fuel cells (SOFCs). Perovskite oxides that serve as cathode in SOFCs suffer from segregation of the aliovalent substitutional cations and the formation of an inert, non-conductive phase at the surface. Here, we demonstrate that the surface of the state-of-the-art SOFC cathode material La0.8Sr0.2MnO3 (LSM) is stabilized against the segregation of Sr at high temperature by submonolayer coverages of Hf. The Hf is vapor-deposited onto the LSM thin film surface by e-beam evaporation. Using in situ near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), we analyze the surface composition of LSM thin films. Half the LSM surface was kept as-prepared, and half was Hf-modified, for a direct comparison of untreated and Hf-treated regions on the same sample. The formation of a binary SrOx surface species is quantified as descriptor for surface degradation. The onset of Sr segregation is observed at 450 °C on the bare LSM, followed by a substantial advance at 550 °C. Hf-treated regions of the same LSM surface exhibit significantly less Sr surface segregation at 450-550 °C. We interpret this stabilization imparted by Hf to arise from the suppression of the electrostatic attraction of Sr2+ cations to surface oxygen vacancies. Doping the surface layer with Hf, that has a higher affinity to oxygen, reduces this attraction by decreasing the surface oxygen vacancy concentration. In doing so, the use of physical vapor deposition highlights the direct role of the metal species in this system and excludes artifacts that could be introduced via chemical routes. The present work demonstrates this stabilizing effect of Hf on the surface of LSM, broadening the relevance of our prior findings on surface metal doping of other perovskite oxides.
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Affiliation(s)
- Roland Bliem
- Department
of Nuclear Science and Engineering, Massachusetts
Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Dongha Kim
- Department
of Materials Science and Engineering, Massachusetts
Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Jiayue Wang
- Department
of Nuclear Science and Engineering, Massachusetts
Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Ethan J. Crumlin
- Advanced
Light Source, Lawrence Berkeley National
Laboratory, One Cyclotron
Road, Berkeley, California 94720, United States
| | - Bilge Yildiz
- Department
of Nuclear Science and Engineering, Massachusetts
Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Department
of Materials Science and Engineering, Massachusetts
Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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23
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Applicability of gas-phase isotope exchange method for investigation of porous materials. J Solid State Electrochem 2021. [DOI: 10.1007/s10008-020-04896-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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24
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Botello ZLM, Montenegro-Hernández A, Mogni L, Gauthier GH. Study of the oxygen reduction reaction on pure and Zr-doped YMnO3+δ SOFC electrode. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2020.137332] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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An insight into the electrocatalytic properties of porous La0.3Sr0.7Fe0.7Cr0.3O3−δ electrodes towards oxygen reduction reaction. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04875-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Determination of Formation Energies and Phase Diagrams of Transition Metal Oxides with DFT+ U. MATERIALS 2020; 13:ma13194303. [PMID: 32993131 PMCID: PMC7579362 DOI: 10.3390/ma13194303] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 09/15/2020] [Accepted: 09/23/2020] [Indexed: 01/18/2023]
Abstract
Knowledge about the formation energies of compounds is essential to derive phase diagrams of multicomponent phases with respect to elemental reservoirs. The determination of formation energies using common (semi-)local exchange-correlation approximations of the density functional theory (DFT) exhibits well-known systematic errors if applied to oxide compounds containing transition metal elements. In this work, we generalize, reevaluate, and discuss a set of approaches proposed and widely applied in the literature to correct for errors arising from the over-binding of the O2 molecule and from correlation effects of electrons in localized transition-metal orbitals. The DFT+U method is exemplarily applied to iron oxide compounds, and a procedure is presented to obtain the U values, which lead to formation energies and electronic band gaps comparable to the experimental values. Using such corrected formation energies, we derive the phase diagrams for LaFeO3, Li5FeO4, and NaFeO2, which are promising materials for energy conversion and storage devices. A scheme is presented to transform the variables of the phase diagrams from the chemical potentials of elemental phases to those of precursor compounds of a solid-state reaction, which represents the experimental synthesis process more appropriately. The discussed workflow of the methods can directly be applied to other transition metal oxides.
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27
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Eremin VA, Ananyev MV, Bouwmeester HJM, Kurumchin EK, Yoo CY. Oxygen surface exchange kinetics of Ba 0.5Sr 0.5Co 0.8Fe 0.2O 3-δ. Phys Chem Chem Phys 2020; 22:10158-10169. [PMID: 32347221 DOI: 10.1039/c9cp06650k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism of oxygen exchange between the gas phase and Ba0.5Sr0.5Co0.8Fe0.2O3-δ oxide was evaluated by considering the inhomogeneity of the oxide surface. The applicability of existing models for the analysis of the oxygen exchange mechanism was considered. A new model with a dissociation step was suggested. The rate-determining steps of the oxygen exchange process were revealed under different experimental conditions. The change in the rate-determining step occurred at 600-650 °C. The probable cause was considered taking into account the parameter of nonequivalency of adsorption centers. A relationship between the oxygen isotope redistribution rates and the rates of the elementary steps in a "gas phase-solid oxide" system was revealed.
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Affiliation(s)
- V A Eremin
- Institute of High Temperature Electrochemistry, UB RAS, Yekaterinburg, Russia.
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28
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Das T, Nicholas JD, Qi Y. Composition, crystallography, and oxygen vacancy ordering impacts on the oxygen ion conductivity of lanthanum strontium ferrite. Phys Chem Chem Phys 2020; 22:9723-9733. [PMID: 32329758 DOI: 10.1039/d0cp00206b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work presents a comprehensive computational study showing how aliovalent doping, crystal structure, and oxygen vacancy interactions impact the oxygen vacancy conductivity of lanthanum strontium ferrite (LSF) as a function of temperature in air. First, density functional theory (DFT) calculations were performed to obtain the oxygen vacancy migration barriers and understand the oxidation state changes on neighboring Fe atoms during oxygen vacancy migration. The oxygen migration barrier energy and the corresponding diffusion coefficient were then combined with previously determined mobile oxygen vacancy concentrations to predict the overall oxygen vacancy conductivity and compare it with experimentally measured values. More importantly, the impact of phase changes, the La/Sr ratio, and the oxygen non-stoichiometry on the mobile oxygen vacancy concentration, diffusivity, and conductivity were analyzed. It was found that stabilizing rhombohedral LSF or cubic SFO (through doping or other means), such that oxygen-vacancy-ordering-induced phase transitions are prevented, leads to high oxygen conductivity under solid oxide fuel cell operating conditions.
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Affiliation(s)
- Tridip Das
- Chemical Engineering & Materials Science Department, Michigan State University, 428 South Shaw Lane, 2527 Engineering Building, East Lansing, MI 48824, USA.
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29
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Structural stability of Lanthanum-based oxygen-deficient perovskites in redox catalysis: A density functional theory study. Catal Today 2020. [DOI: 10.1016/j.cattod.2018.04.070] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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30
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Kim D, Bliem R, Hess F, Gallet JJ, Yildiz B. Electrochemical Polarization Dependence of the Elastic and Electrostatic Driving Forces to Aliovalent Dopant Segregation on LaMnO 3. J Am Chem Soc 2020; 142:3548-3563. [PMID: 31935081 DOI: 10.1021/jacs.9b13040] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Segregation of aliovalent dopant cations is a common degradation pathway on perovskite oxide surfaces in energy conversion and catalysis applications. Here we focus on resolving quantitatively how dopant segregation is affected by oxygen chemical potential, which varies over a wide range in electrochemical and thermochemical energy conversion reactions. We employ electrochemical polarization to tune the oxygen chemical potential over many orders of magnitude. Altering the effective oxygen chemical potential causes the oxygen nonstoichiometry to change in the electrode. This then influences the mechanisms underlying the segregation of aliovalent dopants. These mechanisms are (i) the formation of oxygen vacancies that couples to the electrostatic energy of the dopant in the perovskite lattice and (ii) the elastic energy of the dopant due to cation size mismatch, which also promotes the reaction of the dopant with O2 from the gas phase. The present study resolves these two contributions over a wide range of effective oxygen pressures. Ca-, Sr-, and Ba-doped LaMnO3 are selected as model systems, where the dopants have the same charge but different ionic sizes. We found that there is a transition between the electrostatically and elastically dominated segregation regimes, and the transition shifted to a lower oxygen pressure with increasing cation size. This behavior is consistent with the results of our ab initio thermodynamics calculations. The present study provides quantitative insights into how the elastic energy and the electrostatic energy determine the extent of segregation for a given overpotential and atmosphere relevant to the operating conditions of perovskite oxides in energy conversion applications.
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Affiliation(s)
- Dongha Kim
- Department of Materials Science and Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Roland Bliem
- Department of Nuclear Science and Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Franziska Hess
- Department of Nuclear Science and Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Jean-Jacques Gallet
- Sorbonne Université , CNRS, Laboratoire de Chimie Physique Matière et Rayonnement , UMR 7614, 4 place Jussieu , 75005 Paris , France.,Synchrotron SOLEIL , L'Orme des Merisiers, Saint-Aubin , 91192 Gif sur Yvette, France
| | - Bilge Yildiz
- Department of Materials Science and Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States.,Department of Nuclear Science and Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
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31
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Chen D, Guan Z, Zhang D, Trotochaud L, Crumlin E, Nemsak S, Bluhm H, Tuller HL, Chueh WC. Constructing a pathway for mixed ion and electron transfer reactions for O2 incorporation in Pr0.1Ce0.9O2−x. Nat Catal 2020. [DOI: 10.1038/s41929-019-0401-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Olsson E, Cottom J, Aparicio-Anglès X, de Leeuw NH. Combined density functional theory and molecular dynamics study of Sm0.75A0.25Co1−xMnxO2.88 (A = Ca, Sr; x = 0.125, 0.25) cathode material for next generation solid oxide fuel cell. Phys Chem Chem Phys 2020; 22:692-699. [DOI: 10.1039/c9cp04892h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Computational study of novel next-generation SOFC cathode Sm0.75(Ca,Sr)0.25MnxCo1−xO2.88 showing fast electronic and ionic conduction in bulk.
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Affiliation(s)
- Emilia Olsson
- Department of Chemistry
- University College London
- London
- UK
| | - Jonathon Cottom
- Department of Physics and Astronomy
- University College London
- London
- UK
| | | | - Nora H. de Leeuw
- Department of Chemistry
- University College London
- London
- UK
- School of Chemistry
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33
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Anjum U, Agarwal M, Khan TS, Gupta RK, Haider MA. Controlling surface cation segregation in a nanostructured double perovskite GdBaCo 2O 5+δ electrode for solid oxide fuel cells. NANOSCALE 2019; 11:21404-21418. [PMID: 31674610 DOI: 10.1039/c9nr04734d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Mechanistic studies, utilizing molecular dynamics (MD) and density functional theory (DFT) calculations, were undertaken to provide a molecular level explanation of Ba cation segregation in double perovskite GdBaCo2O5+δ (GBCO) electrodes. The energy (γ) of the terminal surface having only Ba cations, indicated the surface to be the most stable (γ = 6.7 kJ mol-1Å-2) as compared to the other surfaces. MD simulations elaborated on the cation disorder in the near surface region where Ba cations in the subsurface region were observed to migrate towards the surface. This led to a disruption in cation ordering with a propensity to form multiphases in the near surface region. In the near surface zone, oxygen anion diffusivity was observed to be reduced by an order of magnitude (D = 1.6 × 10-11 cm2 s-1 at 873 K) as compared to the bulk oxygen anion diffusivity value (D = 1.96 × 10-10 cm2 s-1 at 873 K). A novel idea was then proposed to control the degree of surface segregation of Ba cations by applying nanostructuring of the GBCO material in the form of nanoparticles. MD simulations elucidated that the near surface region having a high degree of cation disorder in the nanostructured GBCO may regain back the oxygen anion diffusivity value (D = 3.98 × 10-10 cm2 s-1, at 873 K) comparable to the bulk core region (D = 2.51 × 10-10 cm2 s-1, at 873 K). A proof of concept experiment was setup to test this hypothesis. The electrochemical performance of the electrode, fabricated using GBCO nanoparticles, was measured to improve by 15% as compared to the electrode synthesized with a bulk size GBCO material. This was attributed to the control in Ba-cation segregation, obtained on nanostructuring which resulted in higher oxygen anion transport in the near-surface region of the electrode material. XPS characterization of the surface of the nanostructured GBCO materials supported this assertion.
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Affiliation(s)
- Uzma Anjum
- Renewable Energy and Chemicals Laboratory, Chemical Engineering Department, Indian Institute of Technology Delhi, New Delhi, India.
| | - Manish Agarwal
- Computer Services Center, Indian Institute of Technology Delhi, New Delhi, India
| | - Tuhin Suvra Khan
- Renewable Energy and Chemicals Laboratory, Chemical Engineering Department, Indian Institute of Technology Delhi, New Delhi, India.
| | - Raju Kumar Gupta
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India
| | - M Ali Haider
- Renewable Energy and Chemicals Laboratory, Chemical Engineering Department, Indian Institute of Technology Delhi, New Delhi, India.
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Temperature dependency of activity of nano-catalysts on La0.6Sr0.4Co0.2Fe0.8O3−δ cathode of solid oxide fuel cells. J APPL ELECTROCHEM 2019. [DOI: 10.1007/s10800-019-01355-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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35
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Zablotsky D, Rusevich LL, Zvejnieks G, Kuzovkov V, Kotomin E. Manifestation of dipole-induced disorder in self-assembly of ferroelectric and ferromagnetic nanocubes. NANOSCALE 2019; 11:7293-7303. [PMID: 30938394 DOI: 10.1039/c9nr00708c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The colloidal processing of nearly monodisperse and highly crystalline single-domain ferroelectric or ferromagnetic nanocubes is a promising route to produce superlattice structures for integration into next-generation devices, whereas controlling the local behaviour of nanocrystals is imperative for fabricating highly-ordered assemblies. The current picture of nanoscale polarization in individual nanocrystals suggests a potential presence of a significant dipolar interaction, but its role in the condensation of nanocubes is unknown. We simulate the self-assembly of colloidal dipolar nanocubes under osmotic compression and perform the microstructural characterization of their densified ensembles. Our results indicate that the long-range positional and orientational correlations of perovskite nanocubes are highly sensitive to the presence of dipoles.
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Affiliation(s)
- Dmitry Zablotsky
- Institute of Solid State Physics, Kengaraga str. 8, LV-1063 Riga, Latvia
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36
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Abstract
Reducing the working temperature of solid oxide fuel cells is critical to their increased commercialization but is inhibited by the slow oxygen exchange kinetics at the cathode, which limits the overall rate of the oxygen reduction reaction. We use ab initio methods to develop a quantitative elementary reaction model of oxygen exchange in a representative cathode material, La0.5Sr0.5CoO3-δ, and predict that under operating conditions the rate-limiting step for oxygen incorporation from O2 gas on the stable, (001)-SrO surface is lateral (surface) diffusion of O-adatoms and oxygen surface vacancies. We predict that a high vacancy concentration on the metastable CoO2 termination enables a vacancy-assisted O2 dissociation that is 102-103 times faster than the rate limiting step on the Sr-rich (La,Sr)O termination. This result implies that dramatically enhanced oxygen exchange performance could potentially be obtained by suppressing the (La,Sr)O termination and stabilizing highly active CoO2 termination.
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Fe-Doping in Double Perovskite PrBaCo2(1-x)Fe2xO6-δ: Insights into Structural and Electronic Effects to Enhance Oxygen Evolution Catalyst Stability. Catalysts 2019. [DOI: 10.3390/catal9030263] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Perovskite oxides have been gaining attention for its capability to be designed as an ideal electrocatalyst for oxygen evolution reaction (OER). Among promising candidates, the layered double perovskite—PrBaCo2O6-δ (PBC)—has been identified as the most active perovskite electrocatalyst for OER in alkaline media. For a single transition metal oxide catalyst, the addition of Fe enhances its electrocatalytic performance towards OER. To understand the role of Fe, herein, Fe is incorporated in PBC in different ratios, which yielded PrBaCo2(1-x)Fe2xCo6-δ (x = 0, 0.2 and 0.5). Fe-doped PBCF’s demonstrate enhanced OER activities and stabilities. Operando X-ray absorption spectroscopy (XAS) revealed that Co is more stable in a lower oxidation state upon Fe incorporation by establishing charge stability. Hence, the degradation of Co is inhibited such that the perovskite structure is prolonged under the OER conditions, which allows it to serve as a platform for the oxy(hydroxide) layer formation. Overall, our findings underline synergetic effects of incorporating Fe into Co-based layered double perovskite in achieving a higher activity and stability during oxygen evolution reaction.
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38
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Heifets E, Kotomin EA, Bagaturyants AA, Maier J. Thermodynamic stability of non-stoichiometric SrFeO 3-δ: a hybrid DFT study. Phys Chem Chem Phys 2019; 21:3918-3931. [PMID: 30702110 DOI: 10.1039/c8cp07117a] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
SrFeO3-δ is a mixed ionic-electronic conductor with a complex magnetic structure that reveals a colossal magnetoresistance effect. This material and its solid solutions are attractive for various spintronic, catalytic and electrochemical applications, including cathodes for solid oxide fuel cells and permeation membranes. Its properties strongly depend on oxygen non-stoichiometry. Ab initio hybrid functional approach was applied herein to study the thermodynamic stability of a series of SrFeO3-δ compositions with several non-stoichiometries δ, ranging from 0 to 0.5 (SrFeO3-SrFeO2.875-SrFeO2.75-SrFeO2.5) as a function of temperature and oxygen pressure. The results obtained by two approaches, in which either (i) all electrons at Fe atoms explicitly described or (ii) inner core electrons at Fe atoms are replaced by effective core potential, are compared. Based on our calculations, phase diagrams were constructed, allowing the determination of environmental conditions for the existence of stable phases. It is shown that (within an employed model) only the SrFeO2.5 phase appears to be stable. The stability region for this phase was re-drawn on the contour map of oxygen chemical potential, presented as a function of temperature and oxygen partial pressure. A similar analysis was also performed using experimental Gibbs energies of perovskite formation from the elements. The present modelling strongly suggest a significant attraction between neutral oxygen vacancies. These vacancies are created during a series of the abovementioned SrFeO3-δ mutual transformations accompanied by oxygen release.
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Affiliation(s)
- Eugene Heifets
- Photochemistry Center, Federal Research Center "Crystallography and Photonics", Russian Academy of Sciences, Novatorov 7a, Moscow, 119421, Russia.
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Jia T, Zeng Z, Zhang X, Ohodnicki P, Chorpening B, Hackett G, Lekse J, Duan Y. The influence of oxygen vacancy on the electronic and optical properties of ABO3−δ (A = La, Sr, B = Fe, Co) perovskites. Phys Chem Chem Phys 2019; 21:20454-20462. [DOI: 10.1039/c9cp03883c] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ABO3−δ (A = La, Sr, B = Fe, Co) perovskites are useful in a wide range of applications, including their recent exploration for application in high-temperature optical oxygen sensing for energy conversion devices such as solid oxide fuel cells.
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Affiliation(s)
- Ting Jia
- National Energy Technology Laboratory
- United States Department of Energy
- Pittsburgh
- USA
| | - Zhi Zeng
- Key Laboratory of Materials Physics, Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031
- P. R. China
| | - Xiaoli Zhang
- Key Laboratory of Materials Physics, Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031
- P. R. China
| | - Paul Ohodnicki
- National Energy Technology Laboratory
- United States Department of Energy
- Pittsburgh
- USA
| | - Benjamin Chorpening
- National Energy Technology Laboratory
- United States Department of Energy
- Pittsburgh
- USA
| | - Gregory Hackett
- National Energy Technology Laboratory
- United States Department of Energy
- Pittsburgh
- USA
| | - Jonathan Lekse
- National Energy Technology Laboratory
- United States Department of Energy
- Pittsburgh
- USA
| | - Yuhua Duan
- National Energy Technology Laboratory
- United States Department of Energy
- Pittsburgh
- USA
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40
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Yang T, Jin X, Huang K. Transport properties of SrCo0.9Nb0.1O3-δ and SrCo0.9Ta0.1O3-δ mixed conductors determined by combined oxygen permeation measurement and phenomenological modeling. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.09.053] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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41
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Chen H, Guo Z, Zhang LA, Li Y, Li F, Zhang Y, Chen Y, Wang X, Yu B, Shi JM, Liu J, Yang C, Cheng S, Chen Y, Liu M. Improving the Electrocatalytic Activity and Durability of the La 0.6Sr 0.4Co 0.2Fe 0.8O 3-δ Cathode by Surface Modification. ACS APPLIED MATERIALS & INTERFACES 2018; 10:39785-39793. [PMID: 30372019 DOI: 10.1021/acsami.8b14693] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Electrode materials with high activity and good stability are essential for commercialization of energy conversion systems such as solid oxide fuel cells or electrolysis cells at the intermediate temperature. Modifying the existing perovskite-based electrode surface to form a heterostructure has been widely applied for the rational design of novel electrodes with high performance. Despite many successful developments in enhancing electrode performance by surface modification, some controversial results are also reported in the literature and the mechanisms are still not well understood. In this work, the mechanism of how surface modification impacts the oxygen reduction reaction (ORR) activity and stability of perovskite-based oxides was investigated. We took La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) as the thin-film model system and modified its surface with additive Pr xCe1- xO2 layers of different thicknesses. We found a strong correlation between surface oxygen defects and the ORR activity of the heterostructure. By inducing higher oxygen vacancy concentration compared to bare LSCF, PrO2 coating is proved to greatly facilitate the rate of oxygen dissociation, thus significantly enhancing the ORR activity. Because of low oxygen vacancy density introduced by Pr0.2Ce0.8O2 and CeO2 coating, on the one hand, it does not boost the rate of ORR but successfully suppresses surface Sr segregation, leading to an enhanced durability. Our findings demonstrate the vital role of surface oxygen defects and provide important insights for the rational design of high-performance electrode materials through surface defect engineering.
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Affiliation(s)
- Huijun Chen
- Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Institute, School of Environment and Energy , South China University of Technology , Guangzhou 510006 , China
| | - Zheng Guo
- School of Advanced Materials , Shenzhen Graduate School, Peking University , Shenzhen 518055 , China
| | - Lei A Zhang
- Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332-0245 , United States
| | - Yifeng Li
- Institute of Nuclear and New Energy Technology (INET) , Tsinghua University , Beijing 100084 , China
| | - Fei Li
- Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Institute, School of Environment and Energy , South China University of Technology , Guangzhou 510006 , China
| | - Yapeng Zhang
- Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Institute, School of Environment and Energy , South China University of Technology , Guangzhou 510006 , China
| | - Yu Chen
- Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332-0245 , United States
| | - Xinwei Wang
- School of Advanced Materials , Shenzhen Graduate School, Peking University , Shenzhen 518055 , China
| | - Bo Yu
- Institute of Nuclear and New Energy Technology (INET) , Tsinghua University , Beijing 100084 , China
| | - Jian-Min Shi
- Institute of Nuclear Physics and Chemistry , China Academy of Engineering Physics , Mianyang 621000 , China
| | - Jiang Liu
- Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Institute, School of Environment and Energy , South China University of Technology , Guangzhou 510006 , China
| | - Chenghao Yang
- Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Institute, School of Environment and Energy , South China University of Technology , Guangzhou 510006 , China
| | - Shuang Cheng
- Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Institute, School of Environment and Energy , South China University of Technology , Guangzhou 510006 , China
| | - Yan Chen
- Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Institute, School of Environment and Energy , South China University of Technology , Guangzhou 510006 , China
- Guangdong Engineering and Technology Research Center for Surface Chemistry of Energy Materials, School of Environment and Energy , South China University of Technology , Guangzhou 510006 , PR China
| | - Meilin Liu
- Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332-0245 , United States
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42
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Yang T, Matthews AH, Xu N, Chen Y, An K, Ma D, Huang K. Understanding Structure-Activity Relationships in Sr 1- xY xCoO 3-δ through in Situ Neutron Diffraction and Electrochemical Measurements. ACS APPLIED MATERIALS & INTERFACES 2018; 10:35984-35993. [PMID: 30251821 DOI: 10.1021/acsami.8b12943] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this work, we report a systematic study on temperature-dependent local structural evolution, oxygen stoichiometry, and electrochemical properties of an oxygen-deficient perovskite Sr0.7Y0.3CoO3-δ (SYC30) for oxygen electrocatalysis. The obtained results are then closely compared with its analogue Sr0.9Y0.1CoO3-δ (SYC10) of different crystal structures to establish structure-activity relationships. The comparison shows that both SYC30 and SYC10 consist of alternate layers of oxygen-deficient Co1-polyhedra and oxygen-saturated Co2-octahedra with Co1-polyhedra being responsible for Vo•• migration. It is also found that the distribution and concentration of oxygen vacancies within the Co1-layer are, respectively, less symmetrical and lower in SYC30 than those in SYC10, making the former unfavorable for oxygen transport. A molecular orbital energy analysis reveals that the energy gap between Fermi level and O 2p level in the active Co1-polyhedra is larger in SYC30 than that in SYC10, further suggesting that SYC10 is a better oxide-ion conductor and thus a better electrocatalyst for oxygen reduction reaction, which is unambiguously confirmed by the subsequent electrochemical measurements.
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Affiliation(s)
- Tianrang Yang
- Department of Mechanical Engineering , University of South Carolina , Columbia , South Carolina 29208 , United States
| | - Allison H Matthews
- Department of Mechanical Engineering , University of South Carolina , Columbia , South Carolina 29208 , United States
| | - Nansheng Xu
- Department of Mechanical Engineering , University of South Carolina , Columbia , South Carolina 29208 , United States
| | - Yan Chen
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Ke An
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Dong Ma
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Kevin Huang
- Department of Mechanical Engineering , University of South Carolina , Columbia , South Carolina 29208 , United States
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Riva M, Kubicek M, Hao X, Franceschi G, Gerhold S, Schmid M, Hutter H, Fleig J, Franchini C, Yildiz B, Diebold U. Influence of surface atomic structure demonstrated on oxygen incorporation mechanism at a model perovskite oxide. Nat Commun 2018; 9:3710. [PMID: 30213926 PMCID: PMC6137039 DOI: 10.1038/s41467-018-05685-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 07/22/2018] [Indexed: 11/08/2022] Open
Abstract
Perovskite oxide surfaces catalyze oxygen exchange reactions that are crucial for fuel cells, electrolyzers, and thermochemical fuel synthesis. Here, by bridging the gap between surface analysis with atomic resolution and oxygen exchange kinetics measurements, we demonstrate how the exact surface atomic structure can determine the reactivity for oxygen exchange reactions on a model perovskite oxide. Two precisely controlled surface reconstructions with (4 × 1) and (2 × 5) symmetry on 0.5 wt.% Nb-doped SrTiO3(110) were subjected to isotopically labeled oxygen exchange at 450 °C. The oxygen incorporation rate is three times higher on the (4 × 1) surface phase compared to the (2 × 5). Common models of surface reactivity based on the availability of oxygen vacancies or on the ease of electron transfer cannot account for this difference. We propose a structure-driven oxygen exchange mechanism, relying on the flexibility of the surface coordination polyhedra that transform upon dissociation of oxygen molecules.
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Affiliation(s)
- Michele Riva
- Institute of Applied Physics, TU Wien, Wiedner Hauptstraβe 8-10/E134, 1040, Wien, Austria
| | - Markus Kubicek
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidemarkt 9/164EC, 1060, Wien, Austria
| | - Xianfeng Hao
- Key Laboratory of Applied Chemistry, Department of Chemical Engineering, Yanshan University, 066004, Qinhuangdao, China
- Faculty of Physics and Center for Computational Materials Science, University of Vienna, Sensengasse 8/8, 1090, Vienna, Austria
| | - Giada Franceschi
- Institute of Applied Physics, TU Wien, Wiedner Hauptstraβe 8-10/E134, 1040, Wien, Austria
| | - Stefan Gerhold
- Institute of Applied Physics, TU Wien, Wiedner Hauptstraβe 8-10/E134, 1040, Wien, Austria
| | - Michael Schmid
- Institute of Applied Physics, TU Wien, Wiedner Hauptstraβe 8-10/E134, 1040, Wien, Austria
| | - Herbert Hutter
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidemarkt 9/164EC, 1060, Wien, Austria
| | - Juergen Fleig
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidemarkt 9/164EC, 1060, Wien, Austria
| | - Cesare Franchini
- Faculty of Physics and Center for Computational Materials Science, University of Vienna, Sensengasse 8/8, 1090, Vienna, Austria
| | - Bilge Yildiz
- Institute of Applied Physics, TU Wien, Wiedner Hauptstraβe 8-10/E134, 1040, Wien, Austria.
- Laboratory for Electrochemical Interfaces, Departments of Nuclear Science and Engineering, and Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
| | - Ulrike Diebold
- Institute of Applied Physics, TU Wien, Wiedner Hauptstraβe 8-10/E134, 1040, Wien, Austria.
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Hoang K, Johannes MD. Defect physics in complex energy materials. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:293001. [PMID: 29956674 DOI: 10.1088/1361-648x/aacb05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Understanding the physics of structurally and chemically complex transition-metal oxide and polyanionic materials such as those used for battery electrodes is challenging, even at the level of pristine compounds. Yet these materials are also prone to and their properties and performance are strongly affected or even determined by crystallographic point defects. In this review, we highlight recent advances in the study of defects and doping in such materials using first-principles calculations. The emphasis is on describing a theoretical and computational approach that has the ability to predict defect landscapes under various synthesis conditions, provide guidelines for defect characterization and defect-controlled synthesis, uncover the mechanisms for electronic and ionic conduction and electrochemical extraction and (re-)insertion, and provide an understanding of the effects of doping. Though applied to battery materials here, the approach is general and applicable to any materials in which the defect physics plays a role or drives the properties of interest. Thus, this work is intended as an in-depth review of defect physics in particular classes of materials, but also as a methodological template for the understanding and design of complex functional materials.
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Affiliation(s)
- Khang Hoang
- Department of Physics, North Dakota State University, Fargo, ND 58108, United States of America
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45
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Schmid A, Rupp GM, Fleig J. How To Get Mechanistic Information from Partial Pressure-Dependent Current-Voltage Measurements of Oxygen Exchange on Mixed Conducting Electrodes. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2018; 30:4242-4252. [PMID: 30100672 PMCID: PMC6083415 DOI: 10.1021/acs.chemmater.8b00597] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 06/04/2018] [Indexed: 06/08/2023]
Abstract
The oxygen incorporation and evolution reaction on mixed conducting electrodes of solid oxide fuel or electrolysis cells involves gas molecules as well as ionic and electronic point defects in the electrode. The defect concentrations depend on the gas phase and can be modified by the overpotential. These interrelationships make a mechanistic analysis of partial pressure-dependent current-voltage experiments challenging. In this contribution it is described how to exploit this complex situation to unravel the kinetic roles of surface adsorbates and electrode point defects. Essential is a counterbalancing of oxygen partial pressure and dc electrode polarization such that the point defect concentrations in the electrode remain constant despite varying the oxygen partial pressure. It is exemplarily shown for La0.6Sr0.4FeO3-δ (LSF) thin film electrodes on yttria-stabilized zirconia how mechanistically relevant reaction orders can be obtained from current-voltage curves, measured in a three-electrode setup. This analysis strongly suggests electron holes as the limiting defect species for the oxygen evolution on LSF and reveals the dependence of the oxygen incorporation rate on the oxygen vacancy concentration. A virtual independence of the reaction rate from the oxygen partial pressure was empirically found for moderate oxygen pressures. This effect, however, arises from a counterbalancing of defect and adsorbate concentration changes.
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46
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Lu S, Wang G, Chen S, Yu H, Ye F, Quan X. Heterogeneous activation of peroxymonosulfate by LaCo 1-xCu xO 3 perovskites for degradation of organic pollutants. JOURNAL OF HAZARDOUS MATERIALS 2018; 353:401-409. [PMID: 29702455 DOI: 10.1016/j.jhazmat.2018.04.021] [Citation(s) in RCA: 104] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 03/27/2018] [Accepted: 04/10/2018] [Indexed: 06/08/2023]
Abstract
Recently cobalt-based heterogeneous catalysts have been widely investigated for peroxymonosulfate (PMS) activation in sulfate radical-based advanced oxidation processes. However, the improvement of the catalytic performance for PMS activation remains to be a challenge. As the limiting step, the rapid transformation of CoII/CoIII redox pairs is crucial for PMS activation. Perovskites attract increasing attention due to their controllable oxidation state of B-site metal and formation of oxygen vacancies, which accelerates the cycle of redox pairs. LaCo1-xMxO3 (M = Cu, Fe and Mn) perovskites as heterogeneous catalysts of PMS were synthesized for the degradation of phenol. The results showed that LaCo0.4Cu0.6O3 exhibited the highest catalytic activity. The pseudo first-order kinetic constant of phenol degradation on LaCo0.4Cu0.6O3 is 0.302 min-1, being about 5 times as high as Co2+ with same molar concentration of cobalt in LaCo0.4Cu0.6O3. XPS analysis confirmed that substitution of copper could promote the cycle of CoII/CoIII, thus enhance the catalytic efficiency for PMS activation. The facilitated cycle of CoII/CoIII played a crucial role in the generation of sulfate radicals, hydroxyl radicals and singlet oxygen. And sulfate radical was the primary radical responsible for pollutants degradation. The results provide insights into constructing novel perovskite catalysts for the removal of organic pollutants in water.
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Affiliation(s)
- Sen Lu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Guanlong Wang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Shuo Chen
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
| | - Hongtao Yu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Fei Ye
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Xie Quan
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
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47
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Effect of AO Segregation on Catalytical Activity of La0.7A0.3MnO3±δ (A = Ca, Sr, Ba) Regarding Oxygen Reduction Reaction. Catal Letters 2018. [DOI: 10.1007/s10562-018-2456-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Perry NH, Kim JJ, Tuller HL. Oxygen surface exchange kinetics measurement by simultaneous optical transmission relaxation and impedance spectroscopy: Sr(Ti,Fe)O 3-x thin film case study. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2018; 19:130-141. [PMID: 29511391 PMCID: PMC5827802 DOI: 10.1080/14686996.2018.1430448] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 01/17/2018] [Accepted: 01/17/2018] [Indexed: 06/08/2023]
Abstract
We compare approaches to measure oxygen surface exchange kinetics, by simultaneous optical transmission relaxation (OTR) and AC-impedance spectroscopy (AC-IS), on the same mixed conducting SrTi0.65Fe0.35O3-x film. Surface exchange coefficients were evaluated as a function of oxygen activity in the film, controlled by gas partial pressure and/or DC bias applied across the ionically conducting yttria-stabilized zirconia substrate. Changes in measured light transmission through the film over time (relaxations) resulted from optical absorption changes in the film corresponding to changes in its oxygen and oxidized Fe (~Fe4+) concentrations; such relaxation profiles were successfully described by the equation for surface exchange-limited kinetics appropriate for the film geometry. The kchem values obtained by OTR were significantly lower than the AC-IS derived kchem values and kq values multiplied by the thermodynamic factor (bulk or thin film), suggesting a possible enhancement in k by the metal current collectors (Pt, Au). Long-term degradation in kchem and kq values obtained by AC-IS was also attributed to deterioration of the porous Pt current collector, while no significant degradation was observed in the optically derived kchem values. The results suggest that, while the current collector might influence measurements by AC-IS, the OTR method offers a continuous, in situ, and contact-free method to measure oxygen exchange kinetics at the native surfaces of thin films.
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Affiliation(s)
- Nicola H. Perry
- International Institute for Carbon-Neutral Energy Research (WPI-ICNER), Kyushu University, Fukuoka, Japan
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jae Jin Kim
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Harry L. Tuller
- International Institute for Carbon-Neutral Energy Research (WPI-ICNER), Kyushu University, Fukuoka, Japan
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
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Comprehensive Analysis of Trends and Emerging Technologies in All Types of Fuel Cells Based on a Computational Method. SUSTAINABILITY 2018. [DOI: 10.3390/su10020458] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Du Z, Zhang Z, Niemczyk A, Olszewska A, Chen N, Świerczek K, Zhao H. Unveiling the effects of A-site substitutions on the oxygen ion migration in A2−xA′xNiO4+δ by first principles calculations. Phys Chem Chem Phys 2018; 20:21685-21692. [DOI: 10.1039/c8cp04392b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
First principles calculations unveil the effects of A-site substitutions on the interstitial oxygen formation and migration energy in A2−xA′xNiO4+δ.
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Affiliation(s)
- Zhihong Du
- University of Science and Technology Beijing
- School of Materials Science and Engineering
- Beijing 100083
- China
- AGH University of Science and Technology
| | - Zijia Zhang
- University of Science and Technology Beijing
- School of Materials Science and Engineering
- Beijing 100083
- China
- AGH University of Science and Technology
| | - Anna Niemczyk
- AGH University of Science and Technology
- Faculty of Energy and Fuels
- 30-059 Krakow
- Poland
| | - Anna Olszewska
- AGH University of Science and Technology
- Faculty of Energy and Fuels
- 30-059 Krakow
- Poland
| | - Ning Chen
- University of Science and Technology Beijing
- School of Materials Science and Engineering
- Beijing 100083
- China
- Beijing Municiple Key Lab for Advanced Energy Materials and Technologies
| | - Konrad Świerczek
- AGH University of Science and Technology
- Faculty of Energy and Fuels
- 30-059 Krakow
- Poland
- AGH Centre of Energy
| | - Hailei Zhao
- University of Science and Technology Beijing
- School of Materials Science and Engineering
- Beijing 100083
- China
- Beijing Municiple Key Lab for Advanced Energy Materials and Technologies
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