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Zhu W, Shao Y, Zhou B, Yin S, Zhang J, Yin Y, Dong A, Liu Y, Liu X, Li Z. Heteroatom-Doped Defects Anchoring Nano-Pt for High-Stability and Low-Humidity Proton Exchange Membrane Fuel Cell. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2403098. [PMID: 39162110 DOI: 10.1002/smll.202403098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 08/05/2024] [Indexed: 08/21/2024]
Abstract
To meet the ever-increasing demand of proton exchange membrane fuel cell (PEMFC), it is necessary to carry out structure optimization for low-cost and high-stability oxygen reduction reaction (ORR) catalysts. Herein, a zeolitic imidazolate framework (ZIF)-derived carbon material with a mass of heteroatoms and defects is developed and serves as advanced support for nano-Pt-based ORR catalysts. This unique structure enhances the interaction between nano-Pt and support, leading to higher ORR intrinsic activity. During fuel cell applications, it demonstrates impressive water-retaining capacity and electrochemical stability. Under H2-O2 supply without cathode humidification, this catalyst achieves high mass activity of 0.475 A mgPt -1, with only 7.4% attenuation in maximum power density after 20 000 cycles of accelerated durability test, highlighting its remarkable potential for fuel cell applications. Physicochemical characterization and theoretical simulation reveal the crucial anchoring effect of heteroatom-doped defects to nano-Pt, providing valuable insights for further ORR catalyst design and PEMFC applications.
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Affiliation(s)
- Weikang Zhu
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd, Tianjin, 300300, China
- Low-carbon Environmental Protection Department, CATARC Automobile Inspection Center (Tianjin) Co., Ltd, Tianjin, 300300, China
| | - Yuankai Shao
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd, Tianjin, 300300, China
- Low-carbon Environmental Protection Department, CATARC Automobile Inspection Center (Tianjin) Co., Ltd, Tianjin, 300300, China
| | - Bingjie Zhou
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd, Tianjin, 300300, China
- Low-carbon Environmental Protection Department, CATARC Automobile Inspection Center (Tianjin) Co., Ltd, Tianjin, 300300, China
| | - Shuoyao Yin
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd, Tianjin, 300300, China
- Low-carbon Environmental Protection Department, CATARC Automobile Inspection Center (Tianjin) Co., Ltd, Tianjin, 300300, China
| | - Junfeng Zhang
- State Key Laboratory of Engines, School of Mechanical Engineering, Tianjin University, Tianjin, 300072, China
| | - Yan Yin
- State Key Laboratory of Engines, School of Mechanical Engineering, Tianjin University, Tianjin, 300072, China
| | - Anqi Dong
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd, Tianjin, 300300, China
- Low-carbon Environmental Protection Department, CATARC Automobile Inspection Center (Tianjin) Co., Ltd, Tianjin, 300300, China
| | - Yatao Liu
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd, Tianjin, 300300, China
- Low-carbon Environmental Protection Department, CATARC Automobile Inspection Center (Tianjin) Co., Ltd, Tianjin, 300300, China
| | - Xi Liu
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd, Tianjin, 300300, China
- Low-carbon Environmental Protection Department, CATARC Automobile Inspection Center (Tianjin) Co., Ltd, Tianjin, 300300, China
| | - Zhenguo Li
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd, Tianjin, 300300, China
- Low-carbon Environmental Protection Department, CATARC Automobile Inspection Center (Tianjin) Co., Ltd, Tianjin, 300300, China
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Controlled Synthesis of Carbon-Supported Pt-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells. ELECTROCHEM ENERGY R 2022; 5:13. [PMID: 36212026 PMCID: PMC9536324 DOI: 10.1007/s41918-022-00173-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 05/18/2021] [Accepted: 10/15/2021] [Indexed: 10/26/2022]
Abstract
AbstractProton exchange membrane fuel cells are playing an increasing role in postpandemic economic recovery and climate action plans. However, their performance, cost, and durability are significantly related to Pt-based electrocatalysts, hampering their large-scale commercial application. Hence, considerable efforts have been devoted to improving the activity and durability of Pt-based electrocatalysts by controlled synthesis in recent years as an effective method for decreasing Pt use, and consequently, the cost. Therefore, this review article focuses on the synthesis processes of carbon-supported Pt-based electrocatalysts, which significantly affect the nanoparticle size, shape, and dispersion on supports and thus the activity and durability of the prepared electrocatalysts. The reviewed processes include (i) the functionalization of a commercial carbon support for enhanced catalyst–support interaction and additional catalytic effects, (ii) the methods for loading Pt-based electrocatalysts onto a carbon support that impact the manufacturing costs of electrocatalysts, (iii) the preparation of spherical and nonspherical Pt-based electrocatalysts (polyhedrons, nanocages, nanoframes, one- and two-dimensional nanostructures), and (iv) the postsynthesis treatments of supported electrocatalysts. The influences of the supports, key experimental parameters, and postsynthesis treatments on Pt-based electrocatalysts are scrutinized in detail. Future research directions are outlined, including (i) the full exploitation of the potential functionalization of commercial carbon supports, (ii) scaled-up one-pot synthesis of carbon-supported Pt-based electrocatalysts, and (iii) simplification of postsynthesis treatments. One-pot synthesis in aqueous instead of organic reaction systems and the minimal use of organic ligands are preferred to simplify the synthesis and postsynthesis treatment processes and to promote the mass production of commercial carbon-supported Pt-based electrocatalysts.
Graphical Abstract
This review focuses on the synthesis process of Pt-based electrocatalysts/C to develop aqueous one-pot synthesis at large-scale production for PEMFC stack application.
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Microbial Electrosynthesis Inoculated with Anaerobic Granular Sludge and Carbon Cloth Electrodes Functionalized with Copper Nanoparticles for Conversion of CO2 to CH4. NANOMATERIALS 2022; 12:nano12142472. [PMID: 35889697 PMCID: PMC9317797 DOI: 10.3390/nano12142472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 06/21/2022] [Accepted: 07/11/2022] [Indexed: 01/27/2023]
Abstract
Microbial electrosynthesis (MES) can sustainably convert CO2 to products and significant research is currently being conducted towards this end, mainly in laboratory-scale studies. The high-cost ion exchange membrane, however, is one of the main reasons hindering the industrialization of MES. This study investigates the conversion of CO2 (as a sole external carbon source) to CH4 using membraneless MES inoculated with anaerobic granular sludge. Three types of electrodes were tested: carbon cloth (CC) and CC functionalized with Cu NPs, where Cu NPs were deposited for 15 and 45 min, respectively. During the MES experiment, which lasted for 144 days (six cycles), methane was consistently higher in the serum bottles with CC electrodes and applied voltage. The highest CH4 (around 46%) was found in the second cycle after 16 days. The system’s performance declined during the following cycles; nevertheless, the CH4 composition was twice as high compared to the serum bottles without voltage. The MES with Cu NPs functionalized CC electrodes had a higher performance than the MES with plain CC electrodes. Microbial profile analysis showed that the Methanobacterium was the most dominant genus in all samples and it was found in higher abundance on the cathodes, followed by the anodes, and then in the suspended biomass. The genus Geobacter was identified only on the anodes regarding relative bacterial abundance at around 6–10%. Desulfovibrio was the most dominant genus in the cathodes; however, its relative abundance was significantly higher for the cathodes with Cu NPs.
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Zhao X, Wang Y, Zhang Y, Luo S, Zhang H, Leung DYC. Ni-Fe Layered Double Hydroxide Nanosheets Supported on Exfoliated Graphite for Efficient Urea Oxidation in Direct Urea Fuel Cells. CHEMSUSCHEM 2022; 15:e202102614. [PMID: 35179829 DOI: 10.1002/cssc.202102614] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 02/14/2022] [Indexed: 06/14/2023]
Abstract
Urea-rich wastewater can cause serious eutrophication problem to the water environment. On the other hand, urea is a potential fuel with high energy density, which can be effectively utilized by direct urea fuel cell. In this work, exfoliated graphite (EG) with high surface area and electrical conductivity was obtained by microwave irradiation, which was used to support the Ni-Fe layered double hydroxide (LDH), leading to a highly efficient and low-cost urea oxidation catalyst. Compared with commercial RuO2 , the as-prepared Ni-Fe LDH/EG exhibited a lower onset potential of 1.25 V vs. reversible hydrogen electrode as well as a lower Tafel slope of 44 mV dec-1 . The catalyst durability was also proved to be excellent. The optimized Ni/Fe molar ratio was confirmed to be 3 : 1, while the most suitable catalyst/EG ratio was 3 : 50. When applied in a dual-electrolyte direct urea fuel cell, the peak power density reached 12 mW cm-2 , and the long-term discharge was also stable with negligible voltage loss at 10 mA cm-2 for 3 h. Such a low-cost and efficient urea oxidation catalyst can be widely utilized in future direct urea fuel cells, which achieve wastewater treatment and renewable electricity generation at the same time.
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Affiliation(s)
- Xiaolong Zhao
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, P. R. China
| | - Yifei Wang
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, P. R. China
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, P. R. China
| | - Yingguang Zhang
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, P. R. China
| | - Shijing Luo
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, P. R. China
| | - Huimin Zhang
- School of Civil Engineering and Architecture, East China Jiao Tong University, Nanchang, P. R. China
| | - Dennis Y C Leung
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, P. R. China
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The Facile Deposition of Pt Nanoparticles on Reduced Graphite Oxide in Tunable Aryl Alkyl Ionic Liquids for ORR Catalysts. Molecules 2022; 27:molecules27031018. [PMID: 35164281 PMCID: PMC8837963 DOI: 10.3390/molecules27031018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/25/2022] [Accepted: 01/27/2022] [Indexed: 01/01/2023] Open
Abstract
In this study, we present the facile formation of platinum nanoparticles (Pt-NPs) on reduced graphite oxide (rGO) (Pt-NP@rGO) by microwave-induced heating of the organometallic precursor ((MeCp)PtMe3 in different tunable aryl alkyl ionic liquids (TAAIL). In the absence of rGO, transmission electron microscopy (TEM) reveals the formation of dense aggregates of Pt-NPs, with primary particle sizes of 2 to 6 nm. In contrast, in the Pt-NP@rGO samples, Pt-NPs are homogeneously distributed on the rGO, without any aggregation. Pt-NP@rGO samples are used as electrode materials for oxygen reduction reaction (ORR), which was assessed by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The electrochemical surface area (ECSA) and mass-specific activity (MA) increase up to twofold, compared with standard Pt/C 60%, making Pt-NP@rGO a competitive material for ORR.
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Zhang S, Jiang J, Wang H, Li F, Hua T, Wang W. A review of microbial electrosynthesis applied to carbon dioxide capture and conversion: The basic principles, electrode materials, and bioproducts. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101640] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Hussain S, Kongi N, Treshchalov A, Kahro T, Rähn M, Merisalu M, Tamm A, Sammelselg V, Tammeveski K. Enhanced oxygen reduction reaction activity and durability of Pt nanoparticles deposited on graphene-coated alumina nanofibres. NANOSCALE ADVANCES 2021; 3:2261-2268. [PMID: 36133775 PMCID: PMC9417899 DOI: 10.1039/d1na00007a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 01/19/2021] [Indexed: 05/05/2023]
Abstract
The oxygen reduction reaction (ORR) activity and stability of Pt catalysts deposited on graphene-coated alumina nanofibres (GCNFs) were investigated. The GCNFs were fabricated by catalyst-free chemical vapour deposition. Pt nanoparticles (NPs) were deposited on the nanofibres by sonoelectrochemical and plasma-assisted synthesis methods. Scanning and transmission electron microscopy analyses revealed different surface morphologies of the prepared Pt catalysts, depending on the synthesis procedure. Sonoelectrochemical deposition resulted in a uniform distribution of smaller Pt NPs on the support surface, while plasma-assisted synthesis, along with well-dispersed smaller Pt NPs, led to particle agglomeration at certain nucleation sites. Further details about the surface features were obtained from cyclic voltammetry and CO stripping experiments in 0.1 M HClO4 solution. Rotating disk electrode investigations revealed that the Pt/GCNF catalyst is more active towards the ORR in acid media than the commercial Pt/C (20 wt%). The prepared catalyst also showed significantly higher durability than commercial Pt/C, with no change in the half-wave potential after 10 000 potential cycles.
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Affiliation(s)
- Sajid Hussain
- Institute of Chemistry, University of Tartu Ravila 14a 50411 Tartu Estonia +372 7375168
| | - Nadezda Kongi
- Institute of Chemistry, University of Tartu Ravila 14a 50411 Tartu Estonia +372 7375168
| | - Alexey Treshchalov
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Tauno Kahro
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Mihkel Rähn
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Maido Merisalu
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Aile Tamm
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Väino Sammelselg
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Kaido Tammeveski
- Institute of Chemistry, University of Tartu Ravila 14a 50411 Tartu Estonia +372 7375168
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Alekseeva OK, Pushkareva IV, Pushkarev AS, Fateev VN. Graphene and Graphene-Like Materials for Hydrogen Energy. NANOTECHNOLOGIES IN RUSSIA 2020; 15:273-300. [PMID: 33391617 PMCID: PMC7768998 DOI: 10.1134/s1995078020030027] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 06/10/2020] [Accepted: 06/22/2020] [Indexed: 12/17/2022]
Abstract
The review is devoted to current and promising areas of application of graphene and materials based on it for generating environmentally friendly hydrogen energy. Analysis of the results of theoretical and experimental studies of hydrogen accumulation in graphene materials confirms the possibility of creating on their basis systems for reversible hydrogen storage, which combine high capacity, stability, and the possibility of rapid hydrogen evolution under conditions acceptable for practical use. Recent advances in the development of chemically and heat-resistant graphene-based membrane materials make it possible to create new gas separation membranes that provide high permeability and selectivity and are promising for hydrogen purification in processes of its production from natural gas. The characteristics of polymer membranes that are currently used in industry for the most part can be significantly improved with small additions of graphene materials. The use of graphene-like materials as a support of nanoparticles or as functional additives in the composition of the electrocatalytic layer in polymer electrolyte membrane fuel cells makes it possible to improve their characteristics and to increase the activity and stability of the electrocatalyst in the reaction of oxygen evolution.
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Affiliation(s)
- O. K. Alekseeva
- National Research Center Kurchatov Institute, Moscow, Russia
| | | | - A. S. Pushkarev
- National Research Center Kurchatov Institute, Moscow, Russia
| | - V. N. Fateev
- National Research Center Kurchatov Institute, Moscow, Russia
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Atilano-Camino MM, Luévano-Montaño CD, García-González A, Olivo-Alanis DS, Álvarez-Valencia LH, García-Reyes RB. Evaluation of dissolved and immobilized redox mediators on dark fermentation: Driving to hydrogen or solventogenic pathway. BIORESOURCE TECHNOLOGY 2020; 317:123981. [PMID: 32799081 DOI: 10.1016/j.biortech.2020.123981] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 08/04/2020] [Accepted: 08/06/2020] [Indexed: 06/11/2023]
Abstract
In this work, lawsone (LQ) and anthraquinone 2-sulphonate (AQS) (dissolved and covalently immobilized on activated carbon) were evaluated as redox mediators during the dark fermentation of glucose by a pretreated anaerobic sludge. Findings revealed that the use of dissolved LQ increased H2 production (10%), and dissolved AQS improved H2 production rate (11.4%). Furthermore, the total production of liquid byproducts (acetate, butyrate, ethanol, and butanol) was enhanced using dissolved (17%) and immobilized (36%) redox mediators. The established redox standard potentials of LQ and AQS suggested a possible interaction through electron transfer in cytochromes complexes for hydrogen production and the Bcd/EtfAB complex for volatile fatty acid formation.
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Affiliation(s)
- Marina M Atilano-Camino
- Universidad Autónoma de Nuevo León (UANL), Facultad de Ciencias Químicas, Av. Universidad S/N, Cd. Universitaria, C.P. 66455 San Nicolás de los Garza, Nuevo León, Mexico
| | - Cindy D Luévano-Montaño
- Universidad Autónoma de Nuevo León (UANL), Facultad de Ciencias Químicas, Av. Universidad S/N, Cd. Universitaria, C.P. 66455 San Nicolás de los Garza, Nuevo León, Mexico
| | - Alcione García-González
- Universidad Autónoma de Nuevo León (UANL), Facultad de Ciencias Químicas, Av. Universidad S/N, Cd. Universitaria, C.P. 66455 San Nicolás de los Garza, Nuevo León, Mexico
| | - Daniel S Olivo-Alanis
- Universidad Autónoma de Nuevo León (UANL), Facultad de Ciencias Químicas, Av. Universidad S/N, Cd. Universitaria, C.P. 66455 San Nicolás de los Garza, Nuevo León, Mexico
| | - Luis H Álvarez-Valencia
- Instituto Tecnológico de Sonora (ITSON), Departamento de Ciencias Agronómicas y Veterinarias, 5 de Febrero 818 Sur, C.P. 85000 Ciudad Obregón, Sonora, Mexico
| | - Refugio B García-Reyes
- Universidad Autónoma de Nuevo León (UANL), Facultad de Ciencias Químicas, Av. Universidad S/N, Cd. Universitaria, C.P. 66455 San Nicolás de los Garza, Nuevo León, Mexico.
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Getachew T, Addis F, Mehretie S, Yip HL, Xia R, Admassie S. Electrocatalytic reduction of oxygen at platinum nanoparticles dispersed on electrochemically reduced graphene oxide/PEDOT:PSS composites. RSC Adv 2020; 10:30519-30528. [PMID: 35516021 PMCID: PMC9056375 DOI: 10.1039/d0ra05232a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Accepted: 08/13/2020] [Indexed: 11/21/2022] Open
Abstract
Composites of commercially available graphene oxide (GO) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with solvent additive ethylene glycol (EG) were investigated as an alternative support for Pt nanoparticles towards the electrocatalytic reduction of oxygen. The surface characteristics of the materials were examined using atomic force microscopy (AFM), X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDS). Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) at rotating disk electrodes (RDEs) and rotating ring-disk electrodes (RRDEs) were used to characterise the electrocatalytic activities of the composites materials. The structural and electrochemical studies reveal that the addition of EG favours the homogeneous distribution of Pt particles with reduced particle size and improves the electrocatalytic properties. A 30% and 16% increase in electrochemically active surface area (ECSA), a 1.2 and 1.1 fold increase in specific area activity (SA), and a 1.5 and 1.2 fold increase in mass activity (MA) were observed for 30% and 40% Pt loading on PEDOT:PSS after the addition of EG. A composite of rGO and PEDOT:PSS(EG) was investigated for different (w/w) ratios of PEDOT:PSS and rGO. The 1 : 2 w/w ratio showed an enhanced catalytic activity with high limiting current, more positive onset potential, higher SA and MA with lower H2O2 yield compared to PEDOT:PSS(EG) and rGO and previously reported values for PEDOT:PSS.
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Affiliation(s)
- Teklewold Getachew
- Department of Chemistry, Addis Ababa University PBox 1176 Addis Ababa Ethiopia
| | - Fitsum Addis
- Department of Chemistry, Addis Ababa University PBox 1176 Addis Ababa Ethiopia
| | - Solomon Mehretie
- Department of Chemistry, Addis Ababa University PBox 1176 Addis Ababa Ethiopia
| | - Hin-Lap Yip
- State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology 381 Wushan Road Guangzhou 510640 PR China
| | - Ruidong Xia
- State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology 381 Wushan Road Guangzhou 510640 PR China
| | - Shimelis Admassie
- Department of Chemistry, Addis Ababa University PBox 1176 Addis Ababa Ethiopia .,State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology 381 Wushan Road Guangzhou 510640 PR China
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Structural and Electrochemical Properties of Nesting and Core/Shell Pt/TiO2 Spherical Particles Synthesized by Ultrasonic Spray Pyrolysis. METALS 2019. [DOI: 10.3390/met10010011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Pt/TiO2 composites were synthesized by single-step ultrasonic spray pyrolysis (USP) at different temperatures. In an in-situ method, Pt and TiO2 particles were generated from tetra-n-butyl orthotitanate and chloroplatinic acid, and hydrothermally-prepared TiO2 colloidal dispersion served as Pt support in an ex-situ USP approach. USP-synthesized Pt/TiO2 composites were generated in the form of a solid mixture, morphologically organized in nesting huge hollow and small solid spheres, or TiO2 core/Pt shell regular spheroids by in-situ or ex-situ method, respectively. This paper exclusively reports on characteristic mechanisms of the formation of novel two-component solid composites, which are intrinsic from the USP approach and controlled precursor composition. The generation of the two morphological components within the in-situ approach, the hollow spheres and all-solid spheres, was indicated to be caused by characteristic sol-gel/solid phase transition of TiO2. Both the walls of the hollow spheres and the cores of all-solid ones consist of TiO2 matrix populated by 10 nm-sized Pt. On the other hand, spherical, uniformly-sized, Pt particles of a few nanometers in size created a shell uniformly deposited onto TiO2 spheres of ca. 150 nm size. Activities of the prepared samples in an oxygen reduction reaction and combined oxygen reduction and hydrogen evolution reactions were electrochemically tested. The ex-situ synthesized Pt/TiO2 was more active for oxygen reduction and combined oxygen reduction and hydrogen reactions in comparison to the in-situ Pt/TiO2 samples, due to better availability of Pt within a core/shell structure for the reactions.
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Hollow dual core-shell nanocomposite of nitrogen-doped Carbon@Bi12SiO20@Nitrogen-doped graphene as high efficiency catalyst for fuel cell. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134824] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Hernández MR, de León Santillán A, de Casas Ortiz E, Tavizón SF, Moggio I, Arias E, Gallardo-Vega CA, Mercado Silva JA, Barriga-Castro ED. Hollow ZnO microspheres functionalized with electrochemical graphene oxide for the photodegradation of salicylic acid. RSC Adv 2019; 9:6965-6972. [PMID: 35518470 PMCID: PMC9061088 DOI: 10.1039/c8ra10113b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Accepted: 02/18/2019] [Indexed: 01/29/2023] Open
Abstract
Hollow ZnO microspheres were successfully synthesized by a hydrothermal method and then functionalized with graphene oxide (GO) flakes, previously obtained through electrochemical oxidation. Their photocatalytic activity toward the photodegradation of salicylic acid under UV light irradiation was evaluated by UV-Vis spectroscopy. Unfunctionalized microspheres and ZnO functionalized with chemically oxidized graphene were also studied as comparative terms. The hybrid materials of ZnO with both electrochemical and chemical GO gave a similar photodegradation yield of ∼28% against 18% of the non-functionalized microspheres. The similar degradation yields and rate constants obtained with the two GO synthetic methods indicate that electrochemical oxidation of GO represents an eco-friendly option over traditional methods for photocatalytic degradation systems. Hollow ZnO microspheres were successfully synthesized by a hydrothermal method and then functionalized with graphene oxide (GO) flakes, previously obtained through electrochemical oxidation.![]()
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Affiliation(s)
| | - Arxel de León Santillán
- CONACYT-Centro de Investigación en Química Aplicada Boulevard Enrique Reyna 140 25294 Saltillo Coahuila Mexico .,Research Group of Optical Properties of Materials (GPOM), Centro de Investigaciones en Óptica A.P. 1-948 37150 León Gto. Mexico
| | - Edgar de Casas Ortiz
- Centro de Investigación en Química Aplicada Boulevard Enrique Reyna 140 25294 Saltillo Coahuila Mexico
| | | | - Ivana Moggio
- Centro de Investigación en Química Aplicada Boulevard Enrique Reyna 140 25294 Saltillo Coahuila Mexico
| | - Eduardo Arias
- Centro de Investigación en Química Aplicada Boulevard Enrique Reyna 140 25294 Saltillo Coahuila Mexico
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Reyes-Rodríguez JL, Velázquez-Osorio A, Bahena-Uribe D, Soto-Guzmán AB, Leyva MA, Rodríguez-Castellanos A, Citalán-Cigarroa S, Solorza-Feria O. Tailoring the morphology of Ni–Pt nanocatalysts through the variation of oleylamine and oleic acid: a study on oxygen reduction from synthesis to fuel cell application. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00419j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Systematic study on the variation of morphology, size and composition of Ni–Pt nanoparticles with higher catalytic activity towards oxygen reduction.
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Affiliation(s)
- J. L. Reyes-Rodríguez
- Departamento de Química
- Centro de Investigación y de Estudios Avanzados del I.P.N. (CINVESTAV)
- Ciudad de México
- Mexico
| | - A. Velázquez-Osorio
- Departamento de Química
- Centro de Investigación y de Estudios Avanzados del I.P.N. (CINVESTAV)
- Ciudad de México
- Mexico
| | - D. Bahena-Uribe
- Laboratorio Avanzado de Nanoscopía Electrónica (LANE)
- CINVESTAV
- Mexico
| | | | - M. A. Leyva
- Departamento de Química
- Centro de Investigación y de Estudios Avanzados del I.P.N. (CINVESTAV)
- Ciudad de México
- Mexico
| | - A. Rodríguez-Castellanos
- Departamento de Química
- Centro de Investigación y de Estudios Avanzados del I.P.N. (CINVESTAV)
- Ciudad de México
- Mexico
| | - S. Citalán-Cigarroa
- Departamento de Química
- Centro de Investigación y de Estudios Avanzados del I.P.N. (CINVESTAV)
- Ciudad de México
- Mexico
| | - O. Solorza-Feria
- Departamento de Química
- Centro de Investigación y de Estudios Avanzados del I.P.N. (CINVESTAV)
- Ciudad de México
- Mexico
| |
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