1
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Jeong H, Suni II, Chen R, Miletic M, Su X, Seebauer EG. Reactions of fluid and lattice oxygen mediated by interstitial atoms at the TiO 2(110)-water interface. Phys Chem Chem Phys 2025; 27:9522-9536. [PMID: 40241523 DOI: 10.1039/d5cp00319a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2025]
Abstract
O2 interacts with TiO2 surfaces in numerous aqueous reactions for clean hydrogen production, wastewater cleanup, reduction of CO2 and N2, and O2 sensing. In many cases, these reactions involve reversible exchange of O with the solid, whose participation is usually thought to require oxygen vacancies (VO). Based on measurements of oxygen isotopic self-diffusion in rutile TiO2 under water, this work proposes a different perspective centered on O interstitial atoms (Oi). Experiments with varying concentrations of O2 and mole fractions of 18O show that the (110) surface facilitates O exchange with both the H2O liquid and its dissolved O2. First-principles calculations indicate that on-top and "surface Oi" configurations of adsorbed O participate sequentially in the exchange process. Adsorbed OH appears to provide a single pathway for H2O and O2 to contribute oxygen, although fitting the diffusion data to simple models indicates that H2O contributes more. Because rutile TiO2 is a prototypical metal oxide, this picture based on Oi probably generalizes in many cases to other oxides - explaining important aspects of their thermal, electrochemical, and photochemical reactions with dissolved O2.
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Affiliation(s)
- Heonjae Jeong
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
- Department of Electronic Engineering, Gachon University, Seongnam, Gyeonggi 13120, South Korea
| | - Ian I Suni
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
| | - Raylin Chen
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
| | - Marina Miletic
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
| | - Xiao Su
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
| | - Edmund G Seebauer
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
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2
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Bjorklund JL, Augustine LJ, Abbaspour Tamijani A, Trainor TP, Chaka AM, Mason SE. Modeling Pb(II) Adsorption on Mineral Surfaces: Bridging Density Functional Theory and Experiment with Thermodynamic Insights. J Phys Chem A 2025; 129:2754-2767. [PMID: 40048634 DOI: 10.1021/acs.jpca.5c00390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2025]
Abstract
Despite decades of work on aqueous lead (Pb) adsorption on α-Fe2O3 (hematite) and α-Al2O3 (alumina), gaps between measurements and modeling obscure molecular-level understanding. Achieving well-matched geometries between theory and experiment for mineral-water interfaces is a hurdle, as surface functional group type and distribution must be accounted for in determining mechanisms. Additionally, computational methods that can describe the substrate are often not appropriate to capture aqueous effects. Progress requires focusing on well-studied and relevant systems, such as key facets (001), (012), and (110) of hematite and alumina, and ubiquitous contaminants such as aqueous Pb. In the past, bulk-parameterized bond-valence principles were used to rationalize Pb(II) adsorption trends. These approaches can break down at surfaces, where flexible bonding environments and adsorption-induced surface relaxations play a critical role. Here, we adapt and apply a density functional theory (DFT) and thermodynamics framework, integrating DFT-calculated energies with experimental data and electrochemical principles, to predict Pb(II) adsorption. Our model results capture trends across the full set of surfaces and predict that inner-sphere Pb(II) sorption on (001) alumina varies from unfavorable to weakly favorable across a range of pH conditions. This aligns with experimental insights that Pb(II) interacts at that surface through outer-sphere interactions. Extending to Fe(II) adsorption, we demonstrate a coverage-dependent site preference, potentially explaining disorder in overlayers grown by the oxidative adsorption of Fe(II) on hematite (001).
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Affiliation(s)
- Jennifer L Bjorklund
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Logan J Augustine
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | | | - Thomas P Trainor
- Department of Chemistry and Biochemistry, University of Alaska Fairbanks, Fairbanks, Alaska 99775, United States
| | - Anne M Chaka
- Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Sara E Mason
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
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3
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Gracia-Pinilla MÁ, Ramos-Delgado NA, Rosero-Arias C, Sanders R, Bartling S, Winczewski J, Gardeniers H, Susarrey-Arce A. Additive manufacturing of hollow connected networks for solar photo-Fenton-like catalysis. RSC SUSTAINABILITY 2024; 2:3897-3908. [PMID: 39445226 PMCID: PMC11492987 DOI: 10.1039/d4su00312h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2024] [Accepted: 10/15/2024] [Indexed: 10/25/2024]
Abstract
A 3D-printing approach is used to fabricate green bodies/precursor microarchitectures that, upon annealing, allow the fabrication of hierarchical 3D hollow microarchitectures (3DHMs). The 3DHMs are composed mainly of TiO2 and inorganic stabilizers that enable the production of inorganic cellular units upon thermal annealing at 650 °C. Morphological inspection reveals that the 3D architecture beams comprise TiO2 nanoparticles (NPs). The inner and outer diameters of the hollow beams are ∼80 μm and ∼150 μm, retained throughout the 3D hollow network. A proof-of-concept photo-Fenton reaction is assessed. The 3DHMs are impregnated with α-Fe2O3 NPs to evaluate solar photo-Fenton degradation of organic compounds, such as MB used as control and acetaminophen, an organic pollutant. The optical, structural, and chemical environment characteristics, alongside scavenger analysis, generate insights into the proposed solar photo-Fenton degradation reaction over TiO2 3DHMs loaded with α-Fe2O3. Our work demonstrates newly hollow printed microarchitecture with interconnected networks, which can help direct catalytic reactions.
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Affiliation(s)
- Miguel Ángel Gracia-Pinilla
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente PO Box 217 Enschede 7500 AE The Netherlands
- Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Nuevo León San Nicolás de los Garza Nuevo León 66455 Mexico
| | - Norma Alicia Ramos-Delgado
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente PO Box 217 Enschede 7500 AE The Netherlands
- Centro de Investigación e Innovación Tecnológica, IxM CONAHCyT-Tecnológico Nacional de México/I.T. Nuevo León Apodaca Nuevo León Mexico
| | - Cristian Rosero-Arias
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente PO Box 217 Enschede 7500 AE The Netherlands
- School of Engineering and Sciences, Tecnologico de Monterrey Eugenio Garza Sada 2501 Monterrey 64849 NL Mexico
| | - Remco Sanders
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente PO Box 217 Enschede 7500 AE The Netherlands
| | - Stephan Bartling
- Leibniz-Institut für Katalyse e.V. Albert-Einstein-Strasse 29a D-18059 Rostock Germany
| | - Jędrzej Winczewski
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente PO Box 217 Enschede 7500 AE The Netherlands
| | - Han Gardeniers
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente PO Box 217 Enschede 7500 AE The Netherlands
| | - Arturo Susarrey-Arce
- Department of Chemical Engineering, MESA+ Institute, University of Twente P. O. Box 217 Enschede 7500AE The Netherlands
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente PO Box 217 Enschede 7500 AE The Netherlands
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4
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Ryan PT, Sombut P, Rafsanjani-Abbasi A, Wang C, Eratam F, Goto F, Franchini C, Diebold U, Meier M, Duncan DA, Parkinson GS. Quantitative Measurement of Cooperative Binding in Partially Dissociated Water Dimers at the Hematite "R-Cut" Surface. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2024; 128:16977-16985. [PMID: 39416807 PMCID: PMC11481491 DOI: 10.1021/acs.jpcc.4c04537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2024] [Revised: 09/10/2024] [Accepted: 09/11/2024] [Indexed: 10/19/2024]
Abstract
Water-solid interfaces pervade the natural environment and modern technology. On some surfaces, water-water interactions induce the formation of partially dissociated interfacial layers; understanding why is important to model processes in catalysis or mineralogy. The complexity of the partially dissociated structures often makes it difficult to probe them quantitatively. Here, we utilize normal incidence X-ray standing waves (NIXSW) to study the structure of partially dissociated water dimers (H2O-OH) at the α-Fe2O3(012) surface (also called the (11̅02) or "R-cut" surface): a system simple enough to be tractable yet complex enough to capture the essential physics. We find the H2O and terminal OH groups to be the same height above the surface within experimental error (1.45 ± 0.04 and 1.47 ± 0.02 Å, respectively), in line with DFT-based calculations that predict comparable Fe-O bond lengths for both water and OH species. This result is understood in the context of cooperative binding, where the formation of the H-bond between adsorbed H2O and OH induces the H2O to bind more strongly and the OH to bind more weakly compared to when these species are isolated on the surface. The surface OH formed by the liberated proton is found to be in plane with a bulk truncated (012) surface (-0.01 ± 0.02 Å). DFT calculations based on various functionals correctly model the cooperative effect but overestimate the water-surface interaction.
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Affiliation(s)
- Paul T.
P. Ryan
- Institute
of Applied Physics, Technische Universität
Wien, 1040 Vienna, Austria
| | - Panukorn Sombut
- Institute
of Applied Physics, Technische Universität
Wien, 1040 Vienna, Austria
| | | | - Chunlei Wang
- Institute
of Applied Physics, Technische Universität
Wien, 1040 Vienna, Austria
| | - Fulden Eratam
- Diamond
Light Source, Harwell Science and Innovation Campus, OX11 0QX Didcot, U.K.
| | - Francesco Goto
- Diamond
Light Source, Harwell Science and Innovation Campus, OX11 0QX Didcot, U.K.
- Politecnico
di Milano, Piazza Leonardo da Vinci, 20133 Milano MI, Italy
| | - Cesare Franchini
- Faculty
of Physics and Center for Computational Materials Science, University of Vienna, 1040 Vienna, Austria
| | - Ulrike Diebold
- Institute
of Applied Physics, Technische Universität
Wien, 1040 Vienna, Austria
| | - Matthias Meier
- Institute
of Applied Physics, Technische Universität
Wien, 1040 Vienna, Austria
- Faculty
of Physics and Center for Computational Materials Science, University of Vienna, 1040 Vienna, Austria
| | - David A. Duncan
- Diamond
Light Source, Harwell Science and Innovation Campus, OX11 0QX Didcot, U.K.
| | - Gareth S. Parkinson
- Institute
of Applied Physics, Technische Universität
Wien, 1040 Vienna, Austria
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5
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Rafsanjani-Abbasi A, Buchner F, Lewis FJ, Puntscher L, Kraushofer F, Sombut P, Eder M, Pavelec J, Rheinfrank E, Franceschi G, Birschitzky V, Riva M, Franchini C, Schmid M, Diebold U, Meier M, Madsen GKH, Parkinson GS. Digging Its Own Site: Linear Coordination Stabilizes a Pt 1/Fe 2O 3 Single-Atom Catalyst. ACS NANO 2024; 18:26920-26927. [PMID: 39293063 PMCID: PMC11447906 DOI: 10.1021/acsnano.4c08781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/20/2024]
Abstract
Determining the local coordination of the active site is a prerequisite for the reliable modeling of single-atom catalysts (SACs). Obtaining such information is difficult on powder-based systems and much emphasis is placed on density functional theory computations based on idealized low-index surfaces of the support. In this work, we investigate how Pt atoms bind to the (11̅02) facet of α-Fe2O3; a common support material in SACs. Using a combination of scanning tunneling microscopy, X-ray photoelectron spectroscopy, and an extensive computational evolutionary search, we find that Pt atoms significantly reconfigure the support lattice to facilitate a pseudolinear coordination to surface oxygen atoms. Despite breaking three surface Fe-O bonds, this geometry is favored by 0.84 eV over the best configuration involving an unperturbed support. We suggest that the linear O-Pt-O configuration is common in reactive Pt-based SAC systems because it balances thermal stability with the ability to adsorb reactants from the gas phase. Moreover, we conclude that extensive structural searches are necessary to determine realistic active site geometries in single-atom catalysis.
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Affiliation(s)
| | - Florian Buchner
- Institute of Materials Chemistry, TU Wien, Vienna AT 1060, Austria
| | - Faith J Lewis
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
| | - Lena Puntscher
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
| | | | - Panukorn Sombut
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
| | - Moritz Eder
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
| | - Jiří Pavelec
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
| | - Erik Rheinfrank
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
| | | | - Viktor Birschitzky
- Faculty of Physics and Center for Computational Materials Science, University of Vienna, Vienna AT 1090, Austria
| | - Michele Riva
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
| | - Cesare Franchini
- Faculty of Physics and Center for Computational Materials Science, University of Vienna, Vienna AT 1090, Austria
- Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna IT 40126, Italy
| | - Michael Schmid
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
| | - Ulrike Diebold
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
| | - Matthias Meier
- Institute of Applied Physics, TU Wien, Vienna AT 1040, Austria
- Faculty of Physics and Center for Computational Materials Science, University of Vienna, Vienna AT 1090, Austria
| | - Georg K H Madsen
- Institute of Materials Chemistry, TU Wien, Vienna AT 1060, Austria
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6
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Suchodol M, Vejayan H, Zhou X, Jiang B, Guo H, Beck RD. Probing Water Dissociation and Oxygen Replacement on Partially Oxygen-Covered Cu(111) by Reflection Absorption Infrared Spectroscopy. J Phys Chem Lett 2023; 14:7848-7853. [PMID: 37625113 PMCID: PMC10494224 DOI: 10.1021/acs.jpclett.3c02004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 08/21/2023] [Indexed: 08/27/2023]
Abstract
The presence of chemisorbed oxygen on the Cu(111) surface is known to strongly reduce the activation barrier for water dissociation as compared to bare Cu(111). Here, we present direct experimental evidence for the hydrogen abstraction mechanism responsible for the facile H2O dissociation on an O/Cu(111) surface using reflection absorption infrared spectroscopy (RAIRS) in combination with isotopically labeled reactants. We also observe that chemisorbed hydroxyl species produced by water dissociation on the O/Cu(111) surface undergo an efficient hydrogen atom transfer from trapped water molecules, leading to the rapid replacement of the initial oxygen isotope coverage and the detection of only a single hydroxyl isotopologue on the surface, in apparent contradiction with the hydrogen abstraction mechanism. In the presence of Cu2O oxide islands on the O/Cu(111) surface, water dissociation occurs selectively at the edges of those islands, leading to the self-assembly of isotopically ordered structures.
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Affiliation(s)
- Mateusz Suchodol
- Institute
for Chemical Sciences and Engineering (ISIC), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Harmina Vejayan
- Institute
for Chemical Sciences and Engineering (ISIC), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Xueyao Zhou
- Key
Laboratory of Precision and Intelligent Chemistry, Department of Chemical
Physics, Key Laboratory of Surface and Interface Chemistry and Energy
Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Bin Jiang
- Key
Laboratory of Precision and Intelligent Chemistry, Department of Chemical
Physics, Key Laboratory of Surface and Interface Chemistry and Energy
Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Hua Guo
- Department
of Chemistry and Chemical Biology, University
of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Rainer D. Beck
- Institute
for Chemical Sciences and Engineering (ISIC), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
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7
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Jin X, Wu D, Liu C, Huang S, Zhou Z, Wu H, Chen X, Huang M, Zhou S, Gu C. Facet effect of hematite on the hydrolysis of phthalate esters under ambient humidity conditions. Nat Commun 2022; 13:6125. [PMID: 36253413 PMCID: PMC9576771 DOI: 10.1038/s41467-022-33950-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 10/07/2022] [Indexed: 12/24/2022] Open
Abstract
Phthalate esters (PAEs) have been extensively used as additives in plastics and wallcovering, causing severe environmental contamination and increasing public health concerns. Here, we find that hematite nanoparticles with specific facet-control can efficiently catalyze PAEs hydrolysis under ambient humidity conditions, with the hydrolysis rates 2 orders of magnitude higher than that in water saturated condition. The catalytic performance of hematite shows a significant facet-dependence with the reactivity in the order {012} > {104} ≫ {001}, related to the atomic array of surface undercoordinated Fe. The {012} and {104} facets with the proper neighboring Fe-Fe distance of 0.34-0.39 nm can bidentately coordinate with PAEs, and thus induce much stronger Lewis-acid catalysis. Our study may inspire the development of nanomaterials with appropriate surface atomic arrays, improves our understanding for the natural transformation of PAEs under low humidity environment, and provides a promising approach to remediate/purify the ambient air contaminated by PAEs.
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Affiliation(s)
- Xin Jin
- grid.41156.370000 0001 2314 964XState Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, 210023 Nanjing, China
| | - Dingding Wu
- grid.41156.370000 0001 2314 964XState Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, 210023 Nanjing, China
| | - Cun Liu
- grid.9227.e0000000119573309Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, China
| | - Shuhan Huang
- grid.41156.370000 0001 2314 964XState Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, 210023 Nanjing, China
| | - Ziyan Zhou
- grid.41156.370000 0001 2314 964XState Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, 210023 Nanjing, China
| | - Hao Wu
- grid.41156.370000 0001 2314 964XState Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, 210023 Nanjing, China
| | - Xiru Chen
- grid.41156.370000 0001 2314 964XState Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, 210023 Nanjing, China
| | - Meiying Huang
- grid.9227.e0000000119573309Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, China
| | - Shaoda Zhou
- Nanjing Kaver Scientific Instrument Co. Ltd., 210042 Nanjing, China
| | - Cheng Gu
- grid.41156.370000 0001 2314 964XState Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, 210023 Nanjing, China
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8
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Jeong H, Ertekin E, Seebauer EG. Surface-Based Post-synthesis Manipulation of Point Defects in Metal Oxides Using Liquid Water. ACS APPLIED MATERIALS & INTERFACES 2022; 14:34059-34068. [PMID: 35849641 DOI: 10.1021/acsami.2c07672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Initial synthesis of semiconducting oxides leaves behind poorly controlled concentrations of unwanted atomic-scale defects that influence numerous electrical, optical, and reactivity properties. We have discovered through self-diffusion measurements and first-principles computations that poison-free oxide surfaces inject interstitial oxygen atoms into the crystalline solid when simply contacted with liquid water near room temperature. These interstitials diffuse quickly to depths of 20 nm-2 μm and are likely to eliminate prominent classes of unwanted defects or neutralize their action. The mild conditions of operation access a regime for oxide fabrication that relaxes important thermodynamic constraints that hamper defect regulation by conventional methods at higher temperatures. The surface-based approach appears well-suited for use with nanoparticles, porous oxides, and thin films for applications in advanced electronics, renewable energy storage, photocatalysis, and photoelectrochemistry.
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Affiliation(s)
- Heonjae Jeong
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Elif Ertekin
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Edmund G Seebauer
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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9
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Schienbein P, Blumberger J. Nanosecond solvation dynamics of the hematite/liquid water interface at hybrid DFT accuracy using committee neural network potentials. Phys Chem Chem Phys 2022; 24:15365-15375. [PMID: 35703465 DOI: 10.1039/d2cp01708c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal oxide/water interfaces play an important role in biology, catalysis, energy storage and photocatalytic water splitting. The atomistic structure at these interfaces is often difficult to characterize by experimental techniques, whilst results from ab initio molecular dynamics simulations tend to be uncertain due to the limited length and time scales accessible. In this work, we train a committee neural network potential to simulate the hematite/water interface at the hybrid DFT level of theory to reach the nanosecond timescale and systems containing more than 3000 atoms. The NNP enables us to converge dynamical properties, not possible with brute-force ab initio molecular dynamics. Our simulations uncover a rich solvation dynamics at the hematite/water interface spanning three different time scales: picosecond H-bond dynamics between surface hydroxyls and the first water layer, in-plane/out-of-plane tilt motion of surface hydroxyls on the 10 ps time scale, and diffusion of water molecules from the oxide surface characterized by a mean residence lifetime of about 60 ps. Calculation of vibrational spectra confirm that H-bonds between surface hydroxyls and first layer water molecules are stronger than H-bonds in bulk water. Our study showcases how state of the art machine learning approaches can routinely be utilized to explore the structural dynamics at transition metal oxide interfaces with complex electronic structure. It foreshadows that c-NNPs are a promising tool to tackle the sampling problem in ab initio electrochemistry with explicit solvent molecules.
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Affiliation(s)
- Philipp Schienbein
- Department of Physics and Astronomy and Thomas Young Centre, University College London, London, WC1E 6BT, UK.
| | - Jochen Blumberger
- Department of Physics and Astronomy and Thomas Young Centre, University College London, London, WC1E 6BT, UK.
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10
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Wang J, Li C, Zhu Y, Boscoboinik JA, Zhou G. In Situ Monitoring of H 2-Induced Nonstoichiometry in Cu 2O. J Phys Chem Lett 2022; 13:5597-5604. [PMID: 35700476 DOI: 10.1021/acs.jpclett.2c00988] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Using ambient-pressure X-ray photoelectron spectroscopy and Auger electron spectroscopy to monitor the reduction of Cu2O in H2, we identify the formation of an intermediate, oxygen-deficient Cu2O phase and its progressive inward growth into the deeper region of the oxide. Complemented by atomistic modeling, we show that the oxygen-deficient Cu2O formation occurs via molecular H2 adsorption at the Cu2O surface, which results in the loss of lattice oxygen from the formation of H2O molecules that desorb spontaneously from the oxide surface. The resulting oxygen-deficient Cu2O is a stable intermediate that persists before the Cu2O is fully reduced to metallic Cu. The oxygen vacancy-induced charge of the coordinating Cu atoms results in a satellite feature in Cu LMM, which can be used as a fingerprint to identify nonstoichiometry in oxides and local charge transfer induced by the nonstoichiometry.
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Affiliation(s)
- Jianyu Wang
- Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Chaoran Li
- Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Yaguang Zhu
- Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Jorge Anibal Boscoboinik
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Guangwen Zhou
- Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York 13902, United States
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