1
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Jones TE, Teschner D, Piccinin S. Toward Realistic Models of the Electrocatalytic Oxygen Evolution Reaction. Chem Rev 2024; 124:9136-9223. [PMID: 39038270 DOI: 10.1021/acs.chemrev.4c00171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
The electrocatalytic oxygen evolution reaction (OER) supplies the protons and electrons needed to transform renewable electricity into chemicals and fuels. However, the OER is kinetically sluggish; it operates at significant rates only when the applied potential far exceeds the reversible voltage. The origin of this overpotential is hidden in a complex mechanism involving multiple electron transfers and chemical bond making/breaking steps. Our desire to improve catalytic performance has then made mechanistic studies of the OER an area of major scientific inquiry, though the complexity of the reaction has made understanding difficult. While historically, mechanistic studies have relied solely on experiment and phenomenological models, over the past twenty years ab initio simulation has been playing an increasingly important role in developing our understanding of the electrocatalytic OER and its reaction mechanisms. In this Review we cover advances in our mechanistic understanding of the OER, organized by increasing complexity in the way through which the OER is modeled. We begin with phenomenological models built using experimental data before reviewing early efforts to incorporate ab initio methods into mechanistic studies. We go on to cover how the assumptions in these early ab initio simulations─no electric field, electrolyte, or explicit kinetics─have been relaxed. Through comparison with experimental literature, we explore the veracity of these different assumptions. We summarize by discussing the most critical open challenges in developing models to understand the mechanisms of the OER.
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Affiliation(s)
- Travis E Jones
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
- Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max-Planck-Society, Berlin 14195, Germany
| | - Detre Teschner
- Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max-Planck-Society, Berlin 14195, Germany
- Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion, Mülheim an der Ruhr 45470, Germany
| | - Simone Piccinin
- Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali, Trieste 34136, Italy
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2
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Garg P, Mohapatra L, Poonia AK, Kushwaha AK, Adarsh KNVD, Deshpande U. Single Crystalline α-Fe 2O 3 Nanosheets with Improved PEC Performance for Water Splitting. ACS OMEGA 2023; 8:38607-38618. [PMID: 37867698 PMCID: PMC10586280 DOI: 10.1021/acsomega.3c05726] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 09/22/2023] [Indexed: 10/24/2023]
Abstract
We report the photoelectrochemical (PEC) performance of a densely grown single crystalline hematite (α-Fe2O3) nanosheet photoanode for water splitting. Unlike expensive ITO/FTO substrates, the sheets were grown on a piece of pure Fe through controlled thermal oxidation, which is a facile low cost and one-step synthesis route. The sheets grow with a widest surface parallel to basal plane (0001). Iron oxide formed on Fe consisting of layer structure α-Fe2O3-Fe3O4-Fe is elucidated from GIXRD and correlated to spectral features observed in Raman and UV-vis spectroscopy. The top α-Fe2O3 nanosheet layer serves as a photoanode, whereas the conducting Fe3O4 layer serves to transport photogenerated electrons to the counter electrode through its back contact. Time-resolved photoluminescence (TRPL) measurements revealed significantly prolonged carrier lifetime compared to that of bulk. Compared to the thin film of α-Fe2O3 grown on the FTO substrate, ∼3 times higher photocurrent density (0.33 mA cm-2 at 1.23 VRHE) was achieved in the nanosheet sample under solar simulated AM 1.5 G illumination. The sample shows a bandgap of 2.1 eV and n-type conductivity with carrier density 9.59 × 1017 cm-3. Electrochemical impedance spectroscopy (EIS) measurements reveal enhanced charge transport properties. The results suggest that nanosheets synthesized by the simple method yield far better PEC performance than the thin film on the FTO substrate. The anodic shifts of flat band potential, delayed electron-hole recombination, and growth direction parallel to the highly conducting basal plane (0001) being some of the contributing factors to the higher photocurrent observed in the NS photoanode are discussed. Characterizations carried out before and after the PEC reaction show excellent stability of the nanosheets in an alkaline electrochemical environment.
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Affiliation(s)
- Parveen Garg
- UGC-DAE
Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya Pradesh, India
| | - Lokanath Mohapatra
- Department
of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore 453552, India
| | - Ajay Kumar Poonia
- Department
of Physics, Indian Institute of Science
Education and Research Bhopal, Bhopal 462066, India
| | - Ajay Kumar Kushwaha
- Department
of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore 453552, India
| | | | - Uday Deshpande
- UGC-DAE
Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya Pradesh, India
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3
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Einert M, Waheed A, Moritz DC, Lauterbach S, Kundmann A, Daemi S, Schlaad H, Osterloh FE, Hofmann JP. Mesoporous CuFe 2 O 4 Photoanodes for Solar Water Oxidation: Impact of Surface Morphology on the Photoelectrochemical Properties. Chemistry 2023; 29:e202300277. [PMID: 36823437 DOI: 10.1002/chem.202300277] [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: 02/20/2023] [Revised: 02/22/2023] [Accepted: 02/22/2023] [Indexed: 02/25/2023]
Abstract
Metal oxide-based photoelectrodes for solar water splitting often utilize nanostructures to increase the solid-liquid interface area. This reduces charge transport distances and increases the photocurrent for materials with short minority charge carrier diffusion lengths. While the merits of nanostructuring are well established, the effect of surface order on the photocurrent and carrier recombination has not yet received much attention in the literature. To evaluate the impact of pore ordering on the photoelectrochemical properties, mesoporous CuFe2 O4 (CFO) thin film photoanodes were prepared by dip-coating and soft-templating. Here, the pore order and geometry can be controlled by addition of copolymer surfactants poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic® F-127), polyisobutylene-block-poly(ethylene oxide) (PIB-PEO) and poly(ethylene-co-butylene)-block-poly(ethylene oxide) (Kraton liquid™-PEO, KLE). The non-ordered CFO showed the highest photocurrent density of 0.2 mA/cm2 at 1.3 V vs. RHE for sulfite oxidation, but the least photocurrent density for water oxidation. Conversely, the ordered CFO presented the best photoelectrochemical water oxidation performance. These differences can be understood on the basis of the high surface area, which promotes hole transfer to sulfite (a fast hole acceptor), but retards oxidation of water (a slow hole acceptor) due to electron-hole recombination at the defective surface. This interpretation is confirmed by intensity-modulated photocurrent (IMPS) and vibrating Kelvin probe surface photovoltage spectroscopy (VKP-SPS). The lowest surface recombination rate was observed for the ordered KLE-based mesoporous CFO, which retains spherical pore shapes at the surface resulting in fewer surface defects. Overall, this work shows that the photoelectrochemical energy conversion efficiency of copper ferrite thin films is not just controlled by the surface area, but also by surface order.
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Affiliation(s)
- Marcus Einert
- Department of Materials and Earth Sciences, Surface Science Laboratory, Technical University of Darmstadt, Otto-Bernd-Strasse 3, 63287, Darmstadt, Germany
| | - Arslan Waheed
- Department of Materials and Earth Sciences, Surface Science Laboratory, Technical University of Darmstadt, Otto-Bernd-Strasse 3, 63287, Darmstadt, Germany
| | - Dominik C Moritz
- Department of Materials and Earth Sciences, Surface Science Laboratory, Technical University of Darmstadt, Otto-Bernd-Strasse 3, 63287, Darmstadt, Germany
| | - Stefan Lauterbach
- Institute for Applied Geosciences, Geomaterial Science, Technical University of Darmstadt, Schnittspahnstrasse 9, 64287, Darmstadt, Germany
| | - Anna Kundmann
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, USA
| | - Sahar Daemi
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, USA
| | - Helmut Schlaad
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476, Potsdam, Germany
| | - Frank E Osterloh
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, USA
| | - Jan P Hofmann
- Department of Materials and Earth Sciences, Surface Science Laboratory, Technical University of Darmstadt, Otto-Bernd-Strasse 3, 63287, Darmstadt, Germany
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4
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Wang H, Zhou Z, Long R, Prezhdo OV. Passivation of Hematite by a Semiconducting Overlayer Reduces Charge Recombination: An Insight from Nonadiabatic Molecular Dynamics. J Phys Chem Lett 2023; 14:879-887. [PMID: 36661401 DOI: 10.1021/acs.jpclett.2c03643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Hematite (α-Fe2O3) is a promising photoanode material for photoelectrochemical water splitting. Surface-passivating layers are effective in improving water oxidation kinetics; however, the passivation mechanism is not fully understood due to the complexity of interfacial reactions. Focusing on the Fe-terminated Fe2O3 (0001) surface that exhibits surface states in the band gap, we perform ab initio quantum dynamics simulations to study the effect of an α-Ga2O3 overlayer on charge recombination. The overlayer eliminates surface states and suppresses charge recombination 4-fold. This explains in part the observed cathodic shift in the onset potential for water oxidation. The increased charge carrier lifetime is an outcome of two factors, energy gap and electron-vibrational coupling, with a positive contribution from the former but a negative contribution from the latter. This work presents an advance in the atomistic time-domain understanding of the influence of surface passivation on charge recombination dynamics and provides guidance for designing novel α-Fe2O3 photoanodes.
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Affiliation(s)
- Hua Wang
- Department of Chemical Engineering, School of Water and Environment, Chang'an University, Xi'an710064, China
| | - Zhaohui Zhou
- Department of Chemical Engineering, School of Water and Environment, Chang'an University, Xi'an710064, China
| | - Run Long
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing100875, China
| | - Oleg V Prezhdo
- Deparment of Chemistry, University of Southern California, Los Angeles, California90089, United States
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5
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Investigation of photoelectrocatalytic degradation mechanism of methylene blue by α-Fe2O3 nanorods array. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.08.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Xu Y, Wang L, Li Y. Regulating Magnetic Behavior of Fe in Hematene by Defects to Improve Oxygen Evolution Reaction. J Phys Chem Lett 2022; 13:7629-7635. [PMID: 35952374 DOI: 10.1021/acs.jpclett.2c01951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Two-dimensional hematene is earth-abundant and exhibits easy modulation with unique electronic properties, suggesting a promising role as an electrocatalyst for oxygen evolution reaction (OER). In this Letter, we propose a strategy to regulate the magnetic behavior of Fe atoms in hematene by introducing structural defects to enhance its OER activity. Hematene is proved to be thermodynamically stable at electrolyte pH values ≥3 under the OER working potential according to the Pourbaix diagram. Among all the defective structures, the most stable DVFe1-O defect exhibits superior OER activity, which originates from the unique spin state of the active Fe atom. We further propose a novel descriptor of the magnetic moment difference on active Fe to efficiently evaluate the OER activity. We believe that our strategy of combining the defect modulation in the geometric structure and spin-state control in the electronic configuration could provide a guideline to design highly active Fe-based electrocatalysts.
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Affiliation(s)
- Yafeng Xu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, China
| | - Lu Wang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, China
| | - Youyong Li
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, China
- Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa 999078, Macau SAR, China
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7
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Lian X, Duan H, Zeng W, Yu B, Guo W, Lou Q. Kinetics investigation of the oxygen evolution reaction on the characteristic facets of γ-Cu3V2O8. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Liu T, Zhang Q, Zhao Q. Theoretical insight into the anion vacancy healing process during the oxygen evolution reaction on TaON and Ta 3N 5. Phys Chem Chem Phys 2022; 24:13999-14006. [PMID: 35635533 DOI: 10.1039/d2cp01615j] [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
Anion vacancies are common defects in materials, and they are usually much more stable on the outermost surface. These vacancies are sometimes taken as active sites in some reactions during catalysis. During the oxygen evolution reaction (OER), these vacancies may be healed by oxygen atoms from water. But this healing process is not well understood yet. In this work, we investigated the details of the anion vacancy healing process in the OER using TaON and Ta3N5 as models. In the OER process, we found that the vacancies are stable and cannot be healed without an applied potential. But with the equilibrium potential of 1.23 V, the vacancies on the outermost top surface will be healed. The oxygen vacancies, after healing, revert back to a clean surface. The nitrogen vacancies become an oxygen doped surface after vacancy healing. We also investigated the vacancy healing process on other well-known photocatalysts, like TiO2, BiVO4, WO3, α-Fe2O3, NaTaO3 and SrTiO3, and we found that the vacancies on the top surface of these materials will also be healed in the OER with an applied equilibrium potential of 1.23 V. The results presented here could expand to other materials used for the OER in (photo) electro-catalysis and photocatalysis. This work provides a new insight for understanding the role of vacancies in the OER.
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Affiliation(s)
- Taifeng Liu
- National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng, 475004, China.
| | - Qingyan Zhang
- National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng, 475004, China.
| | - Qianyu Zhao
- National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng, 475004, China.
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9
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Nan Y, Zhang Z, He Y, Wei J, Zhou Y. Optimized Nanopores Opened on N-Doped Carbon Nanohorns Filled with Fe/Fe 2O 3 Nanoparticles as Advanced Electrocatalysts for the Oxygen Evolution Reaction. Inorg Chem 2021; 60:16529-16537. [PMID: 34665597 DOI: 10.1021/acs.inorgchem.1c02416] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
N-doped carbon nanohorns filled with Fe nanoparticles (Fe-N-CNHs) were produced by one-step positive pressure-assisted arc discharge in the Ar and N2 mixture. After oxidation treatments in air, Fe was converted into Fe2O3, and nanopores were opened on CNHs from 1 to 5 nm controlled by oxidation temperature. Fe-N-CNHs oxidized in O2 at 550 °C (Fe2O3-N-CNH550ox) show 245 mV at 20 mA cm-1, which is much smaller than that of the ones oxidized at 500 °C (Fe2O3-N-CNH500ox), contributing to the larger pore size on CNHs (3-5 nm vs 2-3 nm) and a larger number of nanopores caused by the enhanced sidewall nanopores. However, the stability of Fe2O3-N-CNH550ox becomes much poorer than that of Fe2O3-N-CNH500ox after 2000 cycles. The unique relationship between the overpotential and long-term stability can be explained by the consideration of the size of Fe2O3 nanoparticles and nanopores on CNHs. Furthermore, the stability for Fe2O3-N-CNH550ox can be rapidly increased after heat treatment in Ar for 1 h caused by shrinking the size of tip nanopores. Herein, we first reveal that the performance of OER is related to the nanopore size of carbon carriers and the catalyst of nanometal particles. The optimization of pore-opening conditions in carbon carriers can be achieved a superior electrocatalytic OER performance, including a low overpotential at high current density and long-term stability.
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Affiliation(s)
- Yanli Nan
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Nano Materials and Technology, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Zihan Zhang
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Nano Materials and Technology, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Yuanyuan He
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Nano Materials and Technology, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Jian Wei
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Nano Materials and Technology, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Yun Zhou
- School of Medical Information and Engineering, Southwest Medical University, Lu Zhou 646000, China
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10
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Rao F, Zhu G, Zhang W, Xu Y, Cao B, Shi X, Gao J, Huang Y, Huang Y, Hojamberdiev M. Maximizing the Formation of Reactive Oxygen Species for Deep Oxidation of NO via Manipulating the Oxygen-Vacancy Defect Position on (BiO)2CO3. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01251] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Fei Rao
- School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, P.R. China
| | - Gangqiang Zhu
- School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, P.R. China
| | - Weibin Zhang
- School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, P.R. China
| | - Yunhua Xu
- School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, P.R. China
| | - Baowei Cao
- School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, P.R. China
| | - Xianjin Shi
- State Key Lab of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, P.R. China
| | - Jianzhi Gao
- School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, P.R. China
| | - Yuhong Huang
- School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, P.R. China
| | - Yu Huang
- State Key Lab of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, P.R. China
| | - Mirabbos Hojamberdiev
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, Berlin 10623, Germany
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11
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Morales-Vidal J, García-Muelas R, Ortuño MA. Defects as catalytic sites for the oxygen evolution reaction in Earth-abundant MOF-74 revealed by DFT. Catal Sci Technol 2021. [DOI: 10.1039/d0cy02163f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The oxygen evolution reaction (OER) is the bottleneck of hydrogen production via water splitting and understanding electrocatalysts at atomic level becomes paramount to enhance the efficiency of this process.
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Affiliation(s)
- Jordi Morales-Vidal
- Institute of Chemical Research of Catalonia (ICIQ)
- Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
| | - Rodrigo García-Muelas
- Institute of Chemical Research of Catalonia (ICIQ)
- Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
| | - Manuel A. Ortuño
- Institute of Chemical Research of Catalonia (ICIQ)
- Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
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12
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Grumelli D, Wiegmann T, Barja S, Reikowski F, Maroun F, Allongue P, Balajka J, Parkinson GS, Diebold U, Kern K, Magnussen OM. Electrochemical Stability of the Reconstructed Fe 3 O 4 (001) Surface. Angew Chem Int Ed Engl 2020; 59:21904-21908. [PMID: 32729209 DOI: 10.1002/anie.202008785] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/24/2020] [Indexed: 11/11/2022]
Abstract
Establishing the atomic-scale structure of metal-oxide surfaces during electrochemical reactions is a key step to modeling this important class of electrocatalysts. Here, we demonstrate that the characteristic (√2×√2)R45° surface reconstruction formed on (001)-oriented magnetite single crystals is maintained after immersion in 0.1 M NaOH at 0.20 V vs. Ag/AgCl and we investigate its dependence on the electrode potential. We follow the evolution of the surface using in situ and operando surface X-ray diffraction from the onset of hydrogen evolution, to potentials deep in the oxygen evolution reaction (OER) regime. The reconstruction remains stable for hours between -0.20 and 0.60 V and, surprisingly, is still present at anodic current densities of up to 10 mA cm-2 and strongly affects the OER kinetics. We attribute this to a stabilization of the Fe3 O4 bulk by the reconstructed surface. At more negative potentials, a gradual and largely irreversible lifting of the reconstruction is observed due to the onset of oxide reduction.
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Affiliation(s)
- Doris Grumelli
- Instituto Nacional de Investigaciones Fisicoquimcas Teoricas y Aplicadas, Universidad Nacional de La Plata, CONICET, La Plata, Argentine
| | | | - Sara Barja
- Departamento de Física de Materiales, Centro de Física de Materiales, University of the Basque Country (UPV/EHU-CSIC), Donostia-San Sebastián, Spain.,Donostia International Physics Center (DIPC), Donostia-San Sebastián, Spain.,IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | | | - Fouad Maroun
- Laboratoire de Physique de la Matière Condensée, CNRS, IP Paris, 91128, Palaiseau, France
| | - Philippe Allongue
- Laboratoire de Physique de la Matière Condensée, CNRS, IP Paris, 91128, Palaiseau, France
| | - Jan Balajka
- Institute of Applied Physics, TU Wien, Vienna, Austria
| | | | | | - Klaus Kern
- Max Planck Institute for Solid State Research, Stuttgart, Germany.,Ecole Polytechnique Fédérale de Lausanne, Switzerland
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13
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Grumelli D, Wiegmann T, Barja S, Reikowski F, Maroun F, Allongue P, Balajka J, Parkinson GS, Diebold U, Kern K, Magnussen OM. Electrochemical Stability of the Reconstructed Fe
3
O
4
(001) Surface. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Doris Grumelli
- Instituto Nacional de Investigaciones Fisicoquimcas Teoricas y Aplicadas Universidad Nacional de La Plata, CONICET La Plata Argentine
| | | | - Sara Barja
- Departamento de Física de Materiales Centro de Física de Materiales University of the Basque Country (UPV/EHU-CSIC) Donostia-San Sebastián Spain
- Donostia International Physics Center (DIPC) Donostia-San Sebastián Spain
- IKERBASQUE Basque Foundation for Science Bilbao Spain
| | | | - Fouad Maroun
- Laboratoire de Physique de la Matière Condensée CNRS, IP Paris 91128 Palaiseau France
| | - Philippe Allongue
- Laboratoire de Physique de la Matière Condensée CNRS, IP Paris 91128 Palaiseau France
| | - Jan Balajka
- Institute of Applied Physics TU Wien Vienna Austria
| | | | | | - Klaus Kern
- Max Planck Institute for Solid State Research Stuttgart Germany
- Ecole Polytechnique Fédérale de Lausanne Switzerland
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14
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da Silva Alvim R, Ribeiro FN, Dalpian GM. Iron and oxygen vacancies at the hematite surface: pristine case and with a chlorine adatom. Phys Chem Chem Phys 2020; 22:25380-25389. [PMID: 33140776 DOI: 10.1039/d0cp03798b] [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
Defect complexes play critical roles in the dynamics of water molecules in photoelectrochemical cell devices. For the specific case of hematite (α-Fe2O3), iron and oxygen vacancies are said to mediate the water splitting process through the localization of optically-derived charges. Using first-principles methods based on density-functional theory we show that both iron and oxygen vacancies can be observed at the surface. For an oxygen-rich environment, usually under wet conditions, the charged iron vacancies should be more frequent. As sea water would be an ideal electrolyte for this kind of device, we have also analyzed the effect of additional chlorine adsorption on this surface. While the chlorine adatom kills the charged oxygen vacancies, entering the void sites, it will not react with the iron vacancies, keeping them active during water splitting processes.
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Affiliation(s)
- Raphael da Silva Alvim
- Centro de Ciências Naturais e Humanas Universidade Federal do ABC Santo André, SP 09210-580, Brazil.
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15
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Govind Rajan A, Martirez JMP, Carter EA. Why Do We Use the Materials and Operating Conditions We Use for Heterogeneous (Photo)Electrochemical Water Splitting? ACS Catal 2020. [DOI: 10.1021/acscatal.0c01862] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ananth Govind Rajan
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544-5263, United States
| | - John Mark P. Martirez
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, California 90095-1592, United States
| | - Emily A. Carter
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544-5263, United States
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, California 90095-1592, United States
- Office of the Chancellor, University of California, Los Angeles, Box 951405, Los Angeles, California 90095-1405, United States
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16
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Understanding Surface Modulation to Improve the Photo/Electrocatalysts for Water Oxidation/Reduction. Molecules 2020; 25:molecules25081965. [PMID: 32340202 PMCID: PMC7221846 DOI: 10.3390/molecules25081965] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/17/2020] [Accepted: 04/18/2020] [Indexed: 12/16/2022] Open
Abstract
Water oxidation and reduction reactions play vital roles in highly efficient hydrogen production conducted by an electrolyzer, in which the enhanced efficiency of the system is apparently accompanied by the development of active electrocatalysts. Solar energy, a sustainable and clean energy source, can supply the kinetic energy to increase the rates of catalytic reactions. In this regard, understanding of the underlying fundamental mechanisms of the photo/electrochemical process is critical for future development. Combining light-absorbing materials with catalysts has become essential to maximizing the efficiency of hydrogen production. To fabricate an efficient absorber-catalysts system, it is imperative to fully understand the vital role of surface/interface modulation for enhanced charge transfer/separation and catalytic activity for a specific reaction. The electronic and chemical structures at the interface are directly correlated to charge carrier movements and subsequent chemical adsorption and reaction of the reactants. Therefore, rational surface modulation can indeed enhance the catalytic efficiency by preventing charge recombination and prompting transfer, increasing the reactant concentration, and ultimately boosting the catalytic reaction. Herein, the authors review recent progress on the surface modification of nanomaterials as photo/electrochemical catalysts for water reduction and oxidation, considering two successive photogenerated charge transfer/separation and catalytic chemical reactions. It is expected that this review paper will be helpful for the future development of photo/electrocatalysts.
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Hajiyani H, Pentcheva R. Influence of 3d, 4d, and 5d dopants on the oxygen evolution reaction at α-Fe 2O 3(0001) under dark and illumination conditions. J Chem Phys 2020; 152:124709. [PMID: 32241156 DOI: 10.1063/1.5143236] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Using density functional theory+U (DFT+U) calculations, we explore the effect of dopants on the performance of α-Fe2O3(0001) as an anode material for the oxygen evolution reaction (OER). Systematic screening of 3d, 4d, and 5d transition metal dopants indicates general trends with dopant band filling and allows us to identify the most efficient dopants with respect to the overpotential and relate those to the solution energy and electronic properties. Different conditions (electrochemical vs photoelectrochemical) are accounted for by considering hydroxylated, hydrated, and oxygenated terminations. Based on the DFT+U results, we identify Rh as the most promising dopant that can reduce the overpotential both under dark and illumination conditions: from 0.56 V to 0.48 V for the hydroxylated surface and quite substantially from 1.12 V to 0.31 V for the hydrated termination and from 0.81 V to 0.56 V for the oxygenated surface. The origin of this improvement is attributed to the modification of the binding energy of chemisorbed species to the Fe2O3(0001) surface. Investigation of the spin density of intermediate steps during the OER shows that surface iron ions adopt a wide range of oxidation states (+2, +3, and +4) in pure hematite, depending on the termination and chemisorbed species on the surface, but a Fe+3 state is stabilized predominantly upon doping. While Rh is in the +3 state in the bulk, it transforms to +4 at the surface and acquires a finite magnetic moment in several intermediate steps.
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Affiliation(s)
- Hamidreza Hajiyani
- Department of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
| | - Rossitza Pentcheva
- Department of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
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18
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Guo W, Lian X. Kinetics mechanism insights into the oxygen evolution reaction on the (110) and (022) crystal facets of β-Cu 2V 2O 7. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00959h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We study the kinetics mechanism for the oxygen evolution reaction (OER) on the (110) and (022) facets of β-Cu2V2O7 using the density functional theory and find that the (110) orientation is more OER active than (022).
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Affiliation(s)
- Wenlong Guo
- Chongqing Key Laboratory of Green Synthesis and Applications
- College of Chemistry
- Chongqing Normal University
- Chongqing
- P. R. China
| | - Xin Lian
- College of Chemistry and Chemical Engineering
- Chongqing University of Science and Technology
- Chongqing
- P. R. China
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19
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Takashima T, Hemmi S, Liu Q, Irie H. Facet-dependent activity of hematite nanocrystals toward the oxygen evolution reaction. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00655f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Hematite showed facet-dependent OER activity and its origin was investigated based on in situ UV-vis absorption measurements and theoretical calculations.
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Affiliation(s)
- Toshihiro Takashima
- Clean Energy Research Center
- University of Yamanashi
- Kofu
- Japan
- Integrated Graduate School of Medicine, Engineering and Agricultural Sciences
| | - Shota Hemmi
- Integrated Graduate School of Medicine, Engineering and Agricultural Sciences
- University of Yamanashi
- Kofu
- Japan
| | - Qingyu Liu
- Department of Applied Chemistry
- Faculty of Engineering
- University of Yamanashi
- Kofu
- Japan
| | - Hiroshi Irie
- Clean Energy Research Center
- University of Yamanashi
- Kofu
- Japan
- Integrated Graduate School of Medicine, Engineering and Agricultural Sciences
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20
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Song J, Wei C, Huang ZF, Liu C, Zeng L, Wang X, Xu ZJ. A review on fundamentals for designing oxygen evolution electrocatalysts. Chem Soc Rev 2020; 49:2196-2214. [PMID: 32133479 DOI: 10.1039/c9cs00607a] [Citation(s) in RCA: 614] [Impact Index Per Article: 153.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Electricity-driven water splitting can facilitate the storage of electrical energy in the form of hydrogen gas. As a half-reaction of electricity-driven water splitting, the oxygen evolution reaction (OER) is the major bottleneck due to the sluggish kinetics of this four-electron transfer reaction. Developing low-cost and robust OER catalysts is critical to solving this efficiency problem in water splitting. The catalyst design has to be built based on the fundamental understanding of the OER mechanism and the origin of the reaction overpotential. In this article, we summarize the recent progress in understanding OER mechanisms, which include the conventional adsorbate evolution mechanism (AEM) and lattice-oxygen-mediated mechanism (LOM) from both theoretical and experimental aspects. We start with the discussion on the AEM and its linked scaling relations among various reaction intermediates. The strategies to reduce overpotential based on the AEM and its derived descriptors are then introduced. To further reduce the OER overpotential, it is necessary to break the scaling relation of HOO* and HO* intermediates in conventional AEM to go beyond the activity limitation of the volcano relationship. Strategies such as stabilization of HOO*, proton acceptor functionality, and switching the OER pathway to LOM are discussed. The remaining questions on the OER and related perspectives are also presented at the end.
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Affiliation(s)
- Jiajia Song
- Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, P. R. China and School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 639798, Singapore. and Singapore-HUJ Alliance for Research and Enterprise, NEW-CREATE Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 138602 Singapore, Singapore
| | - Chao Wei
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 639798, Singapore. and The Cambridge Centre for Advanced Research and Education in Singapore, 1 CREATE way, Singapore 138602, Singapore
| | - Zhen-Feng Huang
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Chuntai Liu
- Key Laboratory of Materials Processing & Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou, 450002, China
| | - Lin Zeng
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Xin Wang
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Zhichuan J Xu
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 639798, Singapore. and Energy Research Institute@NTU, ERI@N, Interdisciplinary Graduate School, Nanyang Technological University, 639798 Singapore, Singapore
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Jafari Foruzin L, Rezvani Z, Nejati K, Hou Z, Dai H, Asadpour-Zeynali K. High quantum efficiency of photocatalytic water oxidation over the TiO2/MMO nanocomposite under visible-light irradiation. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111035] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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23
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Ulman K, Poli E, Seriani N, Piccinin S, Gebauer R. Understanding the electrochemical double layer at the hematite/water interface: A first principles molecular dynamics study. J Chem Phys 2019; 150:041707. [PMID: 30709242 DOI: 10.1063/1.5047930] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Affiliation(s)
- Kanchan Ulman
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
| | - Emiliano Poli
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
| | - Nicola Seriani
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
| | - Simone Piccinin
- CNR-IOM Democritos, c/o SISSA, Via Bonomea 265, 34136 Trieste, Italy
| | - Ralph Gebauer
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
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Wang Z, Mao X, Chen P, Xiao M, Monny SA, Wang S, Konarova M, Du A, Wang L. Understanding the Roles of Oxygen Vacancies in Hematite‐Based Photoelectrochemical Processes. Angew Chem Int Ed Engl 2019; 58:1030-1034. [DOI: 10.1002/anie.201810583] [Citation(s) in RCA: 191] [Impact Index Per Article: 38.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 11/07/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Zhiliang Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Xin Mao
- School of Chemistry, Physics and Mechanical EngineeringQueensland University of Technology Gardens Point Campus Brisbane QLD 4001 Australia
| | - Peng Chen
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Mu Xiao
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Sabiha Akter Monny
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Songcan Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Muxina Konarova
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Aijun Du
- School of Chemistry, Physics and Mechanical EngineeringQueensland University of Technology Gardens Point Campus Brisbane QLD 4001 Australia
| | - Lianzhou Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
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25
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Cao X, Zhang X, Sinha R, Tao S, Bieberle-Hütter A. The importance of charge redistribution during electrochemical reactions: a density functional theory study of silver orthophosphate (Ag3PO4). Phys Chem Chem Phys 2019; 21:9531-9537. [DOI: 10.1039/c8cp07684g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The charge redistribution during oxygen evolution reaction relates to the electrochemical activity as shown for Ag3PO4 structures.
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Affiliation(s)
- Xi Cao
- Center for Computational Energy Research
- Department of Applied Physics
- Eindhoven University of Technology
- Eindhoven
- The Netherlands
| | - Xueqing Zhang
- Electrochemical Materials and Interfaces
- Dutch Institute for Fundamental Energy Research (DIFFER)
- Eindhoven
- The Netherlands
- Center for Computational Energy Research
| | - Rochan Sinha
- Electrochemical Materials and Interfaces
- Dutch Institute for Fundamental Energy Research (DIFFER)
- Eindhoven
- The Netherlands
| | - Shuxia Tao
- Center for Computational Energy Research
- Department of Applied Physics
- Eindhoven University of Technology
- Eindhoven
- The Netherlands
| | - Anja Bieberle-Hütter
- Electrochemical Materials and Interfaces
- Dutch Institute for Fundamental Energy Research (DIFFER)
- Eindhoven
- The Netherlands
- Center for Computational Energy Research
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26
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Wang Z, Mao X, Chen P, Xiao M, Monny SA, Wang S, Konarova M, Du A, Wang L. Understanding the Roles of Oxygen Vacancies in Hematite‐Based Photoelectrochemical Processes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201810583] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zhiliang Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Xin Mao
- School of Chemistry, Physics and Mechanical EngineeringQueensland University of Technology Gardens Point Campus Brisbane QLD 4001 Australia
| | - Peng Chen
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Mu Xiao
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Sabiha Akter Monny
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Songcan Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Muxina Konarova
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
| | - Aijun Du
- School of Chemistry, Physics and Mechanical EngineeringQueensland University of Technology Gardens Point Campus Brisbane QLD 4001 Australia
| | - Lianzhou Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland St. Lucia QLD 4072 Australia
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27
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Grave DA, Yatom N, Ellis DS, Toroker MC, Rothschild A. The "Rust" Challenge: On the Correlations between Electronic Structure, Excited State Dynamics, and Photoelectrochemical Performance of Hematite Photoanodes for Solar Water Splitting. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1706577. [PMID: 29504160 DOI: 10.1002/adma.201706577] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 12/31/2017] [Indexed: 06/08/2023]
Abstract
In recent years, hematite's potential as a photoanode material for solar hydrogen production has ignited a renewed interest in its physical and interfacial properties, which continues to be an active field of research. Research on hematite photoanodes provides new insights on the correlations between electronic structure, transport properties, excited state dynamics, and charge transfer phenomena, and expands our knowledge on solar cell materials into correlated electron systems. This research news article presents a snapshot of selected theoretical and experimental developments linking the electronic structure to the photoelectrochemical performance, with particular focus on optoelectronic properties and charge carrier dynamics.
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Affiliation(s)
- Daniel A Grave
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel
| | - Natav Yatom
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel
| | - David S Ellis
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel
| | - Maytal Caspary Toroker
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel
| | - Avner Rothschild
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel
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28
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Characterization of peroxo reaction intermediates in the water oxidation process on hematite surfaces. J Mol Model 2018; 24:284. [PMID: 30229320 DOI: 10.1007/s00894-018-3815-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 08/29/2018] [Indexed: 10/28/2022]
Abstract
We use density functional theory-based calculations to study structural, electronic, and magnetic properties of two key reaction intermediates on a hematite, [Formula: see text]-Fe2O3, photoanode during the solar-driven water splitting reaction. Both intermediates contain an oxygen atom bonded to a surface iron atom. In one case, the adsorbed oxygen also forms a peroxo bond with a lattice oxygen from hematite; in the second case no such bond is formed. Both configurations are energetically equivalent and are related to the overpotential-determining step in the oxygen evolution reaction. The calculated reaction path for the breaking of the peroxo bond shows a barrier of about 0.86 eV for the transformation between the two intermediates. We explain this high barrier with the drastically different electronic and magnetic structure, which we also analyze using maximally localized Wannier functions. Photo-generated electron holes are shown to localize preferentially close to the reaction center at the surface in both configurations. In the case of the oxo species, this localization favors subsequent electron transfer steps during the oxygen evolution cycle. In the case of the peroxo configuration, this fact together with the high barrier for breaking the oxygen-oxygen bond indicates a possible loss mechanism due to hole trapping. Graphical Abstract Calculated spin density at a hematite surface with peroxo intermediate.
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29
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Li C, Luo Z, Wang T, Gong J. Surface, Bulk, and Interface: Rational Design of Hematite Architecture toward Efficient Photo-Electrochemical Water Splitting. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707502. [PMID: 29750372 DOI: 10.1002/adma.201707502] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 01/27/2018] [Indexed: 06/08/2023]
Abstract
Collecting and storing solar energy to hydrogen fuel through a photo-electrochemical (PEC) cell provides a clean and renewable pathway for future energy demands. Having earth-abundance, low biotoxicity, robustness, and an ideal n-type band position, hematite (α-Fe2 O3 ), the most common natural form of iron oxide, has occupied the research hotspot for decades. Here, a close look into recent progress of hematite photoanodes for PEC water splitting is provided. Effective approaches are introduced, such as cocatalysts loading and surface passivation layer deposition, to improve the hematite surface reaction in thermodynamics and kinetics. Second, typical methods for enhancing light absorption and accelerating charge transport in hematite bulk are reviewed, concentrating upon doping and nanostructuring. Third, the back contact between hematite and substrate, which affects interface states and electron transfer, is deliberated. In addition, perspectives on the key challenges and future prospects for the development of hematite photoelectrodes for PEC water splitting are given.
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Affiliation(s)
- Chengcheng Li
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Zhibin Luo
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Tuo Wang
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Jinlong Gong
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
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30
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Ahamed I, Ulman K, Seriani N, Gebauer R, Kashyap A. Magnetoelectric ϵ-Fe 2O 3: DFT study of a potential candidate for electrode material in photoelectrochemical cells. J Chem Phys 2018; 148:214707. [PMID: 29884044 DOI: 10.1063/1.5025779] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The metastable iron oxide ϵ-Fe2O3 is rare but known for its magnetoelectric properties. While the more common alpha phase has been recognized for a long time as a suitable material for photoelectrochemical cells, its use is limited because of the electron-hole recombination problem when exposed to light. The indirect bandgap of the epsilon phase with its spontaneous polarization may offer a better potential for the application in photoelectrochemistry. Here, we report a detailed study of the electronic and structural features of the epsilon phase of iron oxide, its stability in thin films, and possible water dissociation reactions. Our studies are performed using density functional theory with a Hubbard-U correction. We observe that the stable ϵ-Fe2O3 surfaces favor the dissociation of water. The average difference in the energies of the states when water is adsorbed and when it is dissociated is roughly found to be -0.40 eV. Our results compare with the available experimental results where the epsilon phase is reported to be more efficient for the release of hydrogen from renewable oxygenates when exposed to sunlight.
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Affiliation(s)
- Imran Ahamed
- School of Basic Sciences, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India
| | - Kanchan Ulman
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
| | - Nicola Seriani
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
| | - Ralph Gebauer
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
| | - Arti Kashyap
- School of Basic Sciences, Indian Institute of Technology, Mandi, Himachal Pradesh 175005, India
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Chen Z, Kronawitter CX, Waluyo I, Koel BE. Investigation of Water Dissociation and Surface Hydroxyl Stability on Pure and Ni-Modified CoOOH by Ambient Pressure Photoelectron Spectroscopy. J Phys Chem B 2018; 122:810-817. [PMID: 28880553 DOI: 10.1021/acs.jpcb.7b06960] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Water adsorption and reaction on pure and Ni-modified CoOOH nanowires were investigated using ambient pressure photoemission spectroscopy (APPES). The unique capabilities of APPES enable us to observe water dissociation and monitor formation of surface species on pure and Ni-modified CoOOH under elevated pressures and temperatures for the first time. Over a large range of pressures (UHV to 1 Torr), water dissociates readily on the pure and Ni-modified CoOOH surfaces at 27 °C. With an increase in H2O pressure, a greater degree of surface hydroxylation was observed for all samples. At 1 Torr H2O, ratios of different oxygen species indicate a transformation of CoOOH to CoOxHy in pure and Ni-modified CoOOH. In temperature dependent studies, desorption of weakly bound water and surface dehydroxylation were observed with increasing temperature. Larger percentages of surface hydroxyl groups at higher temperatures were observed on Ni-modified CoOOH compared to pure CoOOH, which indicates an increased stability of surface hydroxyl groups on these Ni-modified surfaces.
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Affiliation(s)
- Zhu Chen
- Department of Chemical and Biological Engineering, Princeton University , Princeton, New Jersey 08544, United States
| | - Coleman X Kronawitter
- Department of Chemical Engineering, University of California at Davis , Davis, California 95616, United States
| | - Iradwikanari Waluyo
- Photon Science Division, National Synchrotron Light Source II, Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Bruce E Koel
- Department of Chemical and Biological Engineering, Princeton University , Princeton, New Jersey 08544, United States
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Seriani N. Ab initio simulations of water splitting on hematite. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:463002. [PMID: 29057752 DOI: 10.1088/1361-648x/aa84d9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In recent years, hematite has attracted great interest as a photocatalyst for water splitting, but many questions remain unanswered about the mechanisms and the main limiting factors. For this reason, density functional theory has been used to understand the optical, electronic and chemical properties of this material at an atomistic level. Bulk doping can be used to reduce the band gap, and to increase photoabsorption and charge mobility. Charge transport takes place through adiabatic polaron hopping. The stable (0 0 0 1) surface has a stoichiometric termination when exposed to oxygen, it becomes hydroxylated in water, and it has an oxygen-rich termination under illumination in a photoelectrochemical setup. On the oxygen-rich termination, surface states are present that might act as recombination centres for electrons and holes. On the contrary, on the hydroxylated termination surface states appear only on reaction intermediates. The intrinsic surface states disappear in the presence of an overlayer of gallium oxide. The reaction of water oxidation is assumed to proceed by four proton-coupled electron transfers and it is shown to involve a nucleophilic attack with the formation of an OOH group. Calculated overpotentials are in the range of 0.5-0.6 V. Open questions and future research directions are briefly discussed.
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Affiliation(s)
- Nicola Seriani
- The Abdus Salam ICTP, Strada Costiera 11, 34151 Trieste, Italy
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33
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Lu N, Zhang WH, Wu XJ. Enhanced Water Oxidation Activity on Ni, Co-Doped Fe2O3 (0001) Surface. CHINESE J CHEM PHYS 2017. [DOI: 10.1063/1674-0068/30/cjcp1705090] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Ning Lu
- CAS Key Laboratory of Materials for Energy Conversion, School of Chemistry and Materials Sciences, and CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China
| | - Wen-hua Zhang
- CAS Key Laboratory of Materials for Energy Conversion, School of Chemistry and Materials Sciences, and CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation of Quantum Information & Quantum Technology, University of Science and Technology of China, Hefei 230026, China
| | - Xiao-jun Wu
- CAS Key Laboratory of Materials for Energy Conversion, School of Chemistry and Materials Sciences, and CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China
- Hefei National Laboratory of Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation of Quantum Information & Quantum Technology, University of Science and Technology of China, Hefei 230026, China
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34
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Water Structure and Mechanisms of Proton Discharge on Platinum Electrodes: Empirical Valence Bond Molecular Dynamics Trajectory Studies. Electrocatalysis (N Y) 2017. [DOI: 10.1007/s12678-017-0398-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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35
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Fisicaro G, Genovese L, Andreussi O, Mandal S, Nair NN, Marzari N, Goedecker S. Soft-Sphere Continuum Solvation in Electronic-Structure Calculations. J Chem Theory Comput 2017. [DOI: 10.1021/acs.jctc.7b00375] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Giuseppe Fisicaro
- Department
of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - Luigi Genovese
- Laboratoire
de simulation atomistique (L_Sim), SP2M, INAC, CEA-UJF, F-38054 Grenoble, France
| | - Oliviero Andreussi
- Institute
of Computational Science, Università della Svizzera Italiana, Via Giuseppe Buffi 13, CH-6904 Lugano, Switzerland
- Theory
and Simulations of Materials (THEOS) and National Centre for Computational
Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne, Station 12, CH-1015 Lausanne, Switzerland
| | - Sagarmoy Mandal
- Department
of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Nisanth N. Nair
- Department
of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Nicola Marzari
- Theory
and Simulations of Materials (THEOS) and National Centre for Computational
Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne, Station 12, CH-1015 Lausanne, Switzerland
| | - Stefan Goedecker
- Department
of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
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36
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Chakrapani K, Bendt G, Hajiyani H, Schwarzrock I, Lunkenbein T, Salamon S, Landers J, Wende H, Schlögl R, Pentcheva R, Behrens M, Schulz S. Role of Composition and Size of Cobalt Ferrite Nanocrystals in the Oxygen Evolution Reaction. ChemCatChem 2017. [DOI: 10.1002/cctc.201700376] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Kalapu Chakrapani
- Faculty of Chemistry, Inorganic Chemistry, and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Universitätsstr. 7 45114 Essen Germany
| | - Georg Bendt
- Faculty of Chemistry, Inorganic Chemistry, and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Universitätsstr. 7 45114 Essen Germany
| | - Hamidreza Hajiyani
- Faculty of Physics and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Lotharstr. 1 47057 Duisburg Germany
| | - Ingo Schwarzrock
- Faculty of Chemistry, Inorganic Chemistry, and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Universitätsstr. 7 45114 Essen Germany
| | - Thomas Lunkenbein
- Fritz-Haber-Institute of the Max-Planck-Society; Department of Inorganic Chemistry; Faradayweg 4-6 14195 Berlin Germany
| | - Soma Salamon
- Faculty of Physics and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Lotharstr. 1 47057 Duisburg Germany
| | - Joachim Landers
- Faculty of Physics and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Lotharstr. 1 47057 Duisburg Germany
| | - Heiko Wende
- Faculty of Physics and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Lotharstr. 1 47057 Duisburg Germany
| | - Robert Schlögl
- Fritz-Haber-Institute of the Max-Planck-Society; Department of Inorganic Chemistry; Faradayweg 4-6 14195 Berlin Germany
- MPI for Chemical Energy Conversion; Stiftstrasse 34-36 D-45470 Mülheim an der Ruhr Germany
| | - Rossitza Pentcheva
- Faculty of Physics and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Lotharstr. 1 47057 Duisburg Germany
| | - Malte Behrens
- Faculty of Chemistry, Inorganic Chemistry, and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Universitätsstr. 7 45114 Essen Germany
- Ertl Center for Electrochemistry and Catalysis of the Gwangju Institute of Science, GIST; 123 Cheomdan-gwagiro, Oryang-dong Buk-gu Gwangju 500-712 South Korea
| | - Stephan Schulz
- Faculty of Chemistry, Inorganic Chemistry, and Center for Nanointegration Duisburg-Essen, CENIDE; University of Duisburg-Essen; Universitätsstr. 7 45114 Essen Germany
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37
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38
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Bemana H, Rashid-Nadimi S. Effect of sulfur doping on photoelectrochemical performance of hematite. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.01.150] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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39
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Zhang X, Cao C, Bieberle-Hütter A. Enhanced electrochemical water oxidation: the impact of nanoclusters and nanocavities. Phys Chem Chem Phys 2017; 19:31300-31305. [DOI: 10.1039/c7cp06852b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Hematite surfaces with a nanocavity are more active for OER than surfaces with nanoclusters.
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Affiliation(s)
- Xueqing Zhang
- Electrochemical Materials and Interfaces
- Dutch Institute for Fundamental Energy Research (DIFFER)
- 5612AJ Eindhoven
- The Netherlands
| | - Chonglong Cao
- School of Physics and Technology
- University of Jinan
- Jinan
- People's Republic of China
| | - Anja Bieberle-Hütter
- Electrochemical Materials and Interfaces
- Dutch Institute for Fundamental Energy Research (DIFFER)
- 5612AJ Eindhoven
- The Netherlands
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40
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Kment S, Riboni F, Pausova S, Wang L, Wang L, Han H, Hubicka Z, Krysa J, Schmuki P, Zboril R. Photoanodes based on TiO2and α-Fe2O3for solar water splitting – superior role of 1D nanoarchitectures and of combined heterostructures. Chem Soc Rev 2017; 46:3716-3769. [DOI: 10.1039/c6cs00015k] [Citation(s) in RCA: 412] [Impact Index Per Article: 58.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Solar driven photoelectrochemical water splitting represents a promising approach for a sustainable and environmentally friendly production of renewable energy vectors and fuel sources, such as H2.
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41
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Yuan D, Zhang L, Lai J, Xie L, Mao B, Zhan D. SECM evaluations of the crystal-facet-correlated photocatalytic activity of hematites for water splitting. Electrochem commun 2016. [DOI: 10.1016/j.elecom.2016.10.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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42
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Bandal H, Jadhav A, Chaugule A, Chung WJ, Kim H. Fe2O3 hollow nanorods/CNT composites as an efficient electrocatalyst for oxygen evolution reaction. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.11.107] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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43
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Yatom N, Toroker MC. Electronic Structure of Catalysis Intermediates by the G0W0 Approximation. Catal Letters 2016. [DOI: 10.1007/s10562-016-1825-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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44
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Zhang X, Bieberle-Hütter A. Modeling and Simulations in Photoelectrochemical Water Oxidation: From Single Level to Multiscale Modeling. CHEMSUSCHEM 2016; 9:1223-42. [PMID: 27219662 DOI: 10.1002/cssc.201600214] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Indexed: 05/11/2023]
Abstract
This review summarizes recent developments, challenges, and strategies in the field of modeling and simulations of photoelectrochemical (PEC) water oxidation. We focus on water splitting by metal-oxide semiconductors and discuss topics such as theoretical calculations of light absorption, band gap/band edge, charge transport, and electrochemical reactions at the electrode-electrolyte interface. In particular, we review the mechanisms of the oxygen evolution reaction, strategies to lower overpotential, and computational methods applied to PEC systems with particular focus on multiscale modeling. The current challenges in modeling PEC interfaces and their processes are summarized. At the end, we propose a new multiscale modeling approach to simulate the PEC interface under conditions most similar to those of experiments. This approach will contribute to identifying the limitations at PEC interfaces. Its generic nature allows its application to a number of electrochemical systems.
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Affiliation(s)
- Xueqing Zhang
- Photo-/Electrochemical Materials and Interfaces, Dutch Institute for Fundamental Energy Research (DIFFER), De Zaale 20, 5612 AJ, Eindhoven, The Netherlands
| | - Anja Bieberle-Hütter
- Photo-/Electrochemical Materials and Interfaces, Dutch Institute for Fundamental Energy Research (DIFFER), De Zaale 20, 5612 AJ, Eindhoven, The Netherlands.
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45
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von Rudorff GF, Jakobsen R, Rosso KM, Blumberger J. Fast Interconversion of Hydrogen Bonding at the Hematite (001)-Liquid Water Interface. J Phys Chem Lett 2016; 7:1155-1160. [PMID: 26954334 DOI: 10.1021/acs.jpclett.6b00165] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The interface between transition-metal oxides and aqueous solutions plays an important role in biogeochemistry and photoelectrochemistry, but the atomistic structure is often elusive. Here we report on the surface geometry, solvation structure, and thermal fluctuations of the hydrogen bonding network at the hematite (001)-water interface as obtained from hybrid density functional theory-based molecular dynamics. We find that the protons terminating the surface form binary patterns by either pointing in-plane or out-of-plane. The patterns exist for about 1 ps and spontaneously interconvert in an ultrafast, solvent-driven process within 50 fs. This results in only about half of the terminating protons pointing toward the solvent and being acidic. The lifetimes of all hydrogen bonds formed at the interface are shorter than those in pure liquid water. The solvation structure reported herein forms the basis for a better fundamental understanding of electron transfer coupled to proton transfer reactions at this important interface.
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Affiliation(s)
| | - Rasmus Jakobsen
- Department of Physics and Astronomy, University College London , London WC1E 6BT, U.K
| | - Kevin M Rosso
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Jochen Blumberger
- Department of Physics and Astronomy, University College London , London WC1E 6BT, U.K
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46
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Neufeld O, Toroker MC. Novel High-Throughput Screening Approach for Functional Metal/Oxide Interfaces. J Chem Theory Comput 2016; 12:1572-82. [DOI: 10.1021/acs.jctc.5b01192] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ofer Neufeld
- The Nancy and Stephen Grand Technion Energy Program and ‡Department of Materials Science
and Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Maytal Caspary Toroker
- The Nancy and Stephen Grand Technion Energy Program and ‡Department of Materials Science
and Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
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47
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Ulman K, Nguyen MT, Seriani N, Gebauer R. Passivation of surface states of α-Fe2O3(0001) surface by deposition of Ga2O3 overlayers: A density functional theory study. J Chem Phys 2016; 144:094701. [DOI: 10.1063/1.4942655] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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48
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Xia C, Jiang Q, Zhao C, Hedhili MN, Alshareef HN. Selenide-Based Electrocatalysts and Scaffolds for Water Oxidation Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:77-85. [PMID: 26540620 DOI: 10.1002/adma.201503906] [Citation(s) in RCA: 251] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 09/30/2015] [Indexed: 05/03/2023]
Abstract
Selenide-based electrocatalysts and scaffolds on carbon cloth are successfully fabricated and demonstrated for enhanced water oxidation applications. A max-imum current density of 97.5 mA cm(-2) at an overpotential of a mere 300 mV and a small Tafel slope of 77 mV dec(-1) are achieved, suggesting the potential of these materials to serve as advanced oxygen evolution reaction catalysts.
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Affiliation(s)
- Chuan Xia
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Qiu Jiang
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Chao Zhao
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Mohamed N Hedhili
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Husam N Alshareef
- Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
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49
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Neufeld O, Yatom N, Caspary Toroker M. A First-Principles Study on the Role of an Al2O3 Overlayer on Fe2O3 for Water Splitting. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01748] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ofer Neufeld
- The Nancy and Stephen Grand Technion Energy Program and ‡The Department of Materials Science
and Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Natav Yatom
- The Nancy and Stephen Grand Technion Energy Program and ‡The Department of Materials Science
and Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Maytal Caspary Toroker
- The Nancy and Stephen Grand Technion Energy Program and ‡The Department of Materials Science
and Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
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50
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Nguyen MT. Computational study of α-M2O3 (M = Al, Ga): surface properties, water adsorption and oxidation. RSC Adv 2015. [DOI: 10.1039/c5ra00222b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
DFT calculations reveal the most stable phases of water monolayer on α-M2O3(0001) (M = Al, Ga) in the (ΔμO, ΔμH2O) space.
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Affiliation(s)
- Manh-Thuong Nguyen
- The Abdus Salam International Centre for Theoretical Physics
- 34151 Trieste
- Italy
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