1
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Liu P, Klyushin A, Chandramathy Surendran P, Fedorov A, Xie W, Zeng C, Huang X. Carbon Encapsulation of Supported Metallic Iridium Nanoparticles: An in Situ Transmission Electron Microscopy Study and Implications for Hydrogen Evolution Reaction. ACS NANO 2023. [PMID: 38047675 DOI: 10.1021/acsnano.3c10850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Carbon-supported metal nanoparticles (NPs) comprise an important class of heterogeneous catalysts. The interaction between the metal and carbon support influences the overall material properties, viz., the catalytic performance. Herein we use in situ and ex situ transmission electron microscopy (TEM) in combination with in situ X-ray spectroscopy (XPS) to investigate the encapsulation of metallic iridium NPs by carbon in an Ir/C catalyst. Real-time atomic-scale imaging visualizes particle reshaping and increased graphitization of the carbon support upon heating of Ir/C in vacuum. According to in situ TEM results, carbon overcoating grows over Ir NPs during the heating process, starting from ca. 550 °C. With the carbon overlayers formed, no sintering and migration of Ir NPs is observed at 800 °C, yet the initial Ir NPs sinter at or below 550 °C, i.e., at a temperature associated with an incomplete particle encapsulation. The carbon overlayer corrugates when the temperature is decreased from 800 to 200 °C and this process is associated with the particle surface reconstruction and is reversible, such that the corrugated carbon overlayer can be smoothed out by increasing the temperature back to 800 °C. The catalytic performance (activity and stability) of the encapsulated Ir NPs in the hydrogen evolution reaction (HER) is higher than that of the initial (nonencapsulated) state of Ir/C. Overall, this work highlights microscopic details of the currently understudied phenomenon of the carbon encapsulation of supported noble metal NPs and demonstrates additionally that the encapsulation by carbon is an effective measure for tuning the catalytic performance.
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Affiliation(s)
- Panpan Liu
- College of Chemistry, Fuzhou University, 350108 Fuzhou, P. R. China
- Qingyuan Innovation Laboratory, 362100 Quanzhou, P. R. China
| | - Alexander Klyushin
- Department of Inorganic Chemistry, Fritz-Haber Institute of Max Planck Society, 14195 Berlin, Germany
- Research Group Catalysis for Energy, Helmholtz-Zentrum Berlin for Materials and Energy (BESSY II), Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | | | - Alexey Fedorov
- Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Wangjing Xie
- College of Chemistry, Fuzhou University, 350108 Fuzhou, P. R. China
- Qingyuan Innovation Laboratory, 362100 Quanzhou, P. R. China
| | - Chaobin Zeng
- Hitachi High-Tech Scientific Solutions (Beijing) Co., Ltd., 100015 Beijing, P. R. China
| | - Xing Huang
- College of Chemistry, Fuzhou University, 350108 Fuzhou, P. R. China
- Qingyuan Innovation Laboratory, 362100 Quanzhou, P. R. China
- Department of Inorganic Chemistry, Fritz-Haber Institute of Max Planck Society, 14195 Berlin, Germany
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2
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Ruiz Esquius J, Morgan DJ, Algara Siller G, Gianolio D, Aramini M, Lahn L, Kasian O, Kondrat SA, Schlögl R, Hutchings GJ, Arrigo R, Freakley SJ. Lithium-Directed Transformation of Amorphous Iridium (Oxy)hydroxides To Produce Active Water Oxidation Catalysts. J Am Chem Soc 2023; 145:6398-6409. [PMID: 36892000 PMCID: PMC10037335 DOI: 10.1021/jacs.2c13567] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
Abstract
The oxygen evolution reaction (OER) is crucial to future energy systems based on water electrolysis. Iridium oxides are promising catalysts due to their resistance to corrosion under acidic and oxidizing conditions. Highly active iridium (oxy)hydroxides prepared using alkali metal bases transform into low activity rutile IrO2 at elevated temperatures (>350 °C) during catalyst/electrode preparation. Depending on the residual amount of alkali metals, we now show that this transformation can result in either rutile IrO2 or nano-crystalline Li-intercalated IrOx. While the transition to rutile results in poor activity, the Li-intercalated IrOx has comparative activity and improved stability when compared to the highly active amorphous material despite being treated at 500 °C. This highly active nanocrystalline form of lithium iridate could be more resistant to industrial procedures to produce PEM membranes and provide a route to stabilize the high populations of redox active sites of amorphous iridium (oxy)hydroxides.
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Affiliation(s)
- Jonathan Ruiz Esquius
- Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis FUNCAT, Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, Braga 4715-330, Portugal
| | - David J Morgan
- Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis FUNCAT, Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Gerardo Algara Siller
- Department of Inorganic Chemistry, Fritz Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
| | - Diego Gianolio
- Diamond Light Source Ltd, Harwell Science and Innovation Campus, Fermi Avenue, Didcot OX11 0DE, U.K
| | - Matteo Aramini
- Diamond Light Source Ltd, Harwell Science and Innovation Campus, Fermi Avenue, Didcot OX11 0DE, U.K
| | - Leopold Lahn
- Helmholtz Institut Erlangen-Nürnberg, Helmholtz-Zentrum Berlin GmbH, Cauerstr. 1, 91058 Erlangen, Germany
- Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Olga Kasian
- Helmholtz Institut Erlangen-Nürnberg, Helmholtz-Zentrum Berlin GmbH, Cauerstr. 1, 91058 Erlangen, Germany
- Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Simon A Kondrat
- Department of Chemistry, Loughborough University, Epinal Way, Loughborough, Leicestershire LE11 3TU, U.K
| | - Robert Schlögl
- Department of Inorganic Chemistry, Fritz Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, 45470 Mulheim an der Ruhr, Germany
| | - Graham J Hutchings
- Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis FUNCAT, Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Rosa Arrigo
- School of Science, Engineering and Environment, University of Salford, Manchester M5 4WT, U.K
| | - Simon J Freakley
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 2AY, U.K
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Wang Y, Wang T, Rong Z, Wang Y, Qu J. Role of Hydroxyl on Metal Surface in Hydrogenation Reactions. J Catal 2023. [DOI: 10.1016/j.jcat.2023.01.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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4
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Ma X, Deng L, Lu M, He Y, Zou S, Xin Y. Heterostructure of core-shell IrCo@IrCoO xas efficient and stable catalysts for oxygen evolution reaction. NANOTECHNOLOGY 2021; 33:125702. [PMID: 34874299 DOI: 10.1088/1361-6528/ac4068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 12/06/2021] [Indexed: 06/13/2023]
Abstract
Although researches on non-noble metal electrocatalysts have been made some progress recently, their performance in proton exchange membrane water electrolyzer is still incomparable to that of noble-metal-based catalysts. Therefore, it is a more practical way to improve the utilization of precious metals in electrocatalysts for oxygen evolution reaction (OER) in the acidic medium. Herein, nanostructured IrCo@IrCoOxcore-shell electrocatalysts composed of IrCo alloy core and IrCoOxshell were synthesized through a simple colloidally synthesis and calcination method. As expected, the hybrid IrCo-200 NPs with petal-like morphology show the best OER activities in acidic electrolytes. They deliver lower overpotential and better electrocatalytic kinetics than pristine IrCo alloy and commercial Ir/C, reaching a low overpotential (j = 10 mA cm-2) of 259 mV (versus RHE) and a Tafel slope of 59 mV dec-1. The IrCo-200 NPs displayed robust durability with life time of about 55 h in acidic solution under a large current density of 50 mA cm-2. The enhanced electrocatalytic activity may be associated with the unique metal/amorphous metal oxide core-shell heterostructure, allowing the improved charge transferability. Moreover, the *OH-rich amorphous shell functions as the active site for OER and prevents the further dissolution of the metallic core and thus ensures high stability.
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Affiliation(s)
- Xiaoping Ma
- School of Physical Science and Technology & Jiangsu Key Laboratory of Thin Films, People's Republic of China
- Soochow University, Suzhou 215006, People's Republic of China
| | - Lili Deng
- School of Physical Science and Technology & Jiangsu Key Laboratory of Thin Films, People's Republic of China
- Soochow University, Suzhou 215006, People's Republic of China
| | - Manting Lu
- School of Physical Science and Technology & Jiangsu Key Laboratory of Thin Films, People's Republic of China
- Soochow University, Suzhou 215006, People's Republic of China
| | - Yi He
- School of Physical Science and Technology & Jiangsu Key Laboratory of Thin Films, People's Republic of China
- Soochow University, Suzhou 215006, People's Republic of China
| | - Shuai Zou
- School of Physical Science and Technology & Jiangsu Key Laboratory of Thin Films, People's Republic of China
- Soochow University, Suzhou 215006, People's Republic of China
| | - Yu Xin
- School of Physical Science and Technology & Jiangsu Key Laboratory of Thin Films, People's Republic of China
- Soochow University, Suzhou 215006, People's Republic of China
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Li L, Wang P, Shao Q, Huang X. Recent Progress in Advanced Electrocatalyst Design for Acidic Oxygen Evolution Reaction. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2004243. [PMID: 33749035 DOI: 10.1002/adma.202004243] [Citation(s) in RCA: 110] [Impact Index Per Article: 36.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 10/16/2020] [Indexed: 05/27/2023]
Abstract
Proton exchange membrane (PEM) water electrolyzers hold great significance for renewable energy storage and conversion. The acidic oxygen evolution reaction (OER) is one of the main roadblocks that hinder the practical application of PEM water electrolyzers. Highly active, cost-effective, and durable electrocatalysts are indispensable for lowering the high kinetic barrier of OER to achieve boosted reaction kinetics. To date, a wide spectrum of advanced electrocatalysts has been designed and synthesized for enhanced acidic OER performance, though Ir and Ru based nanostructures still represent the state-of-the-art catalysts. In this Progress Report, recent research progress in advanced electrocatalysts for improved acidic OER performance is summarized. First, fundamental understanding about acidic OER including reaction mechanisms and atomic understanding to acidic OER for rational design of efficient electrocatalysts are discussed. Thereafter, an overview of the progress in the design and synthesis of advanced acidic OER electrocatalysts is provided in terms of catalyst category, i.e., metallic nanostructures (Ir and Ru based), precious metal oxides, nonprecious metal oxides, and carbon based nanomaterials. Finally, perspectives to the future development of acidic OER are provided from the aspects of reaction mechanism investigation and more efficient electrocatalyst design.
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Affiliation(s)
- Leigang Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China
| | - Pengtang Wang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China
| | - Qi Shao
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China
| | - Xiaoqing Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China
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6
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Baik C, Lee SW, Pak C. Glycine-induced ultrahigh-surface-area IrO2@IrOx catalyst with balanced activity and stability for efficient water splitting. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138885] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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7
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High crystallinity design of Ir-based catalysts drives catalytic reversibility for water electrolysis and fuel cells. Nat Commun 2021; 12:4271. [PMID: 34257287 PMCID: PMC8277764 DOI: 10.1038/s41467-021-24578-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 04/30/2021] [Indexed: 12/31/2022] Open
Abstract
The voltage reversal of water electrolyzers and fuel cells induces a large positive potential on the hydrogen electrodes, followed by severe system degradation. Applying a reversible multifunctional electrocatalyst to the hydrogen electrode is a practical solution. Ir exhibits excellent catalytic activity for hydrogen evolution reactions (HER), and hydrogen oxidation reactions (HOR), yet irreversibly converts to amorphous IrOx at potentials > 0.8 V/RHE, which is an excellent catalyst for oxygen evolution reactions (OER), yet a poor HER and HOR catalyst. Harnessing the multifunctional catalytic characteristics of Ir, here we design a unique Ir-based electrocatalyst with high crystallinity for OER, HER, and HOR. Under OER operation, the crystalline nanoparticle generates an atomically-thin IrOx layer, which reversibly transforms into a metallic Ir at more cathodic potentials, restoring high activity for HER and HOR. Our analysis reveals that a metallic Ir subsurface under thin IrOx layer can act as a catalytic substrate for the reduction of Ir ions, creating reversibility. Our work not only uncovers fundamental, uniquely reversible catalytic properties of nanoparticle catalysts, but also offers insights into nanocatalyst design. Reversible multifunctionality in electrocatalysts can allow voltage reversal during device operation. Here, authors design a crystalline Ir-based electrocatalyst with a thin reversible metallic-Ir/IrOx layer that shows activity for O2 evolution, H2 evolution, and H2 oxidation.
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Kluge RM, Haid RW, Bandarenka AS. Assessment of active areas for the oxygen evolution reaction on an amorphous iridium oxide surface. J Catal 2021. [DOI: 10.1016/j.jcat.2021.02.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Li X, Zhang B, Pan X, Ji J, Ren Y, Wang H, Ji N, Liu Q, Li C. One-Pot Conversion of Lignin into Naphthenes Catalyzed by a Heterogeneous Rhenium Oxide-Modified Iridium Compound. CHEMSUSCHEM 2020; 13:4409-4419. [PMID: 31944598 DOI: 10.1002/cssc.201903286] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 01/06/2020] [Indexed: 06/10/2023]
Abstract
The direct transformation of lignin into fuels and chemicals remains a huge challenge because of the recalcitrant and complicated structure of lignin. In this study, rhenium oxide-modified iridium supported on SiO2 (Ir-ReOx /SiO2 ) is employed for the one-pot conversion of various lignin model compounds and lignin feedstocks into naphthenes. Up to 100 % yield of cyclohexane from model compounds and 44.3 % yield of naphthenes from lignin feedstocks are achieved. 2 D HSQC NMR spectroscopy before and after the reaction confirms the activity of Ir-ReOx /SiO2 in the cleavage of the C-O bonds and hydrodeoxygenation of the depolymerized products. H2 temperature-programmed reduction, temperature-programmed desorption of NH3 , IR spectroscopy of pyridine adsorption, X-ray photoelectron spectroscopy, X-ray absorption fine structure analysis, and control experiments reveal that a synergistic effect between Ir and ReOx in Ir-ReOx /SiO2 plays a crucial role in the high performance; ReOx is mainly responsible for the cleavage of C-O bonds, whereas Ir is responsible for hydrodeoxygenation and saturation of the benzene rings. This methodology opens up an energy-efficient route for the direct conversion of lignin into valuable naphthenes.
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Affiliation(s)
- Xinxin Li
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
- School of Environmental Science and Engineering, Key Laboratory of Biomass-Derived Gas and Oil for Chinese Petrochemical Industry, Tianjin University, Tianjin, 300350, P.R. China
| | - Bo Zhang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
| | - Xiaoli Pan
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
| | - Jianwei Ji
- Shaanxi Key Laboratory of Catalysis, School of Chemistry and Environment Science, Shaanxi Sci-tech University, 1 Dongyihuan Road, Hanzhong, 723001, P.R. China
| | - Yujing Ren
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
| | - Hua Wang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
| | - Na Ji
- School of Environmental Science and Engineering, Key Laboratory of Biomass-Derived Gas and Oil for Chinese Petrochemical Industry, Tianjin University, Tianjin, 300350, P.R. China
| | - Qiying Liu
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, P.R. China
- Dalian National Laboratory for Clean Energy, 457 Zhongshan Road, Dalian, 116023, P.R. China
| | - Changzhi Li
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
- Dalian National Laboratory for Clean Energy, 457 Zhongshan Road, Dalian, 116023, P.R. China
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Lee WH, Yi J, Nong HN, Strasser P, Chae KH, Min BK, Hwang YJ, Oh HS. Electroactivation-induced IrNi nanoparticles under different pH conditions for neutral water oxidation. NANOSCALE 2020; 12:14903-14910. [PMID: 32638785 DOI: 10.1039/d0nr02951c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Electrochemical oxidation processes can affect the electronic structure and activate the catalytic performance of precious-metal and transition-metal based catalysts for the oxygen evolution reaction (OER). Also there are emerging requirements to develop OER electrocatalysts under various pH conditions in order to couple with different reduction reactions. Herein, we studied the effect of pH on the electroactivation of IrNi alloy nanoparticles supported on carbon (IrNi/C) and evaluated the electrocatalytic activities of the activated IrNiOx/C for water oxidation under neutral conditions. In addition, their electronic structures and atomic arrangement were analyzed by in situ/operando X-ray absorption spectroscopy (XAS) and identical location transmission electron microscopy techniques, showing the reconstruction of the metal elements during electroactivation due to their different stabilities depending on the electrolyte pH. IrNiOx/C activated under neutral pH conditions showed a mildly oxidized thin IrOx shell. Meanwhile, IrNiOx/C activated in acidic and alkaline electrolytes showed Ni-leached IrOx and Ni-rich IrNiOx surfaces, respectively. Particularly, the surface of IrNiOx/C activated under alkaline conditions shows IrOx with a high d-band hole and NiOx with a high oxidation state leading to excellent OER catalytic activity in neutral media (η = 384 mV at 10 mA cm-2) whereas much lower OER activity was reported under alkaline or acid conditions. Our results, which showed that electrochemically activated catalysts under different pH conditions exhibit a unique electronic structure by modifying the initial alloy catalyst, can be applied for the design of catalysts suitable for various electrochemical reactions.
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Affiliation(s)
- Woong Hee Lee
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea.
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11
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Saeed KH, Forster M, Li JF, Hardwick LJ, Cowan AJ. Water oxidation intermediates on iridium oxide electrodes probed by in situ electrochemical SHINERS. Chem Commun (Camb) 2020; 56:1129-1132. [DOI: 10.1039/c9cc08284k] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) is applied to the study of a state-of-the-art water oxidation electrocatalyst, IrOx, during oxygen evolution.
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Affiliation(s)
- Khezar H. Saeed
- Stephenson Institute for Renewable Energy and the Department of Chemistry
- University of Liverpool
- Liverpool
- UK
| | - Mark Forster
- Stephenson Institute for Renewable Energy and the Department of Chemistry
- University of Liverpool
- Liverpool
- UK
| | - Jian-Feng Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- China
| | - Laurence J. Hardwick
- Stephenson Institute for Renewable Energy and the Department of Chemistry
- University of Liverpool
- Liverpool
- UK
| | - Alexander J. Cowan
- Stephenson Institute for Renewable Energy and the Department of Chemistry
- University of Liverpool
- Liverpool
- UK
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12
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Yang L, Chen H, Shi L, Li X, Chu X, Chen W, Li N, Zou X. Enhanced Iridium Mass Activity of 6H-Phase, Ir-Based Perovskite with Nonprecious Incorporation for Acidic Oxygen Evolution Electrocatalysis. ACS APPLIED MATERIALS & INTERFACES 2019; 11:42006-42013. [PMID: 31633901 DOI: 10.1021/acsami.9b11287] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
One of the key objectives in PEM electrolysis technology is to reduce iridium loading and to improve iridium mass activity at the side of oxygen evolution electrocatalysis. 6H-phase, Ir-based perovskite (6H-SrIrO3) is known to be a promising alternative to the IrO2 catalyst, and developing effective strategies to further enhance its catalytic performance is needed. Here we present that a significant enhancement in electrocatalytic activity for the oxygen evolution reaction of 6H-SrIrO3 can be achieved by cobalt incorporation. A suitable amount of cobalt dopants results in a decreased formation temperature of 6H-SrIrO3 from 700 to 500 °C and thereby a decreased thickness of platelike particles for the material. Besides the morphological effect, the cobalt incorporation also increases the coverage of surface hydroxyl groups, regulates the Ir-O bond covalency, and modulates the oxygen p-band center of the material. This synergistic optimization of the morphological, surface, and electronic structures makes the cobalt-doped 6H-SrIrO3 catalyst give a 3-fold increase in iridium mass activity for oxygen evolution reaction in comparison with the undoped 6H-SrIrO3 under acidic conditions.
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Affiliation(s)
- Lan Yang
- College of Materials Science and Engineering , Jilin University , Changchun 130022 , P. R. China
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry , Jilin University , Changchun 130012 , P. R. China
| | - Hui Chen
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry , Jilin University , Changchun 130012 , P. R. China
| | - Lei Shi
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry , Jilin University , Changchun 130012 , P. R. China
| | - Xiaotian Li
- College of Materials Science and Engineering , Jilin University , Changchun 130022 , P. R. China
| | - Xuefeng Chu
- Key Laboratory of Architectural Cold Climate Energy Management, Ministry of Education , Jilin Jianzhu University , Changchun 130118 , China
| | - Wei Chen
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry , Jilin University , Changchun 130023 , P. R. China
| | - Nan Li
- College of Materials Science and Engineering , Jilin University , Changchun 130022 , P. R. China
| | - Xiaoxin Zou
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry , Jilin University , Changchun 130012 , P. R. China
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13
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Vos JG, Liu Z, Speck FD, Perini N, Fu W, Cherevko S, Koper MTM. Selectivity Trends Between Oxygen Evolution and Chlorine Evolution on Iridium-Based Double Perovskites in Acidic Media. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01159] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Johannes G. Vos
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Zhichao Liu
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Florian D. Speck
- Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Nickson Perini
- Sao Carlos Institute of Chemistry, Sao Paulo University, Avenida Trabalhador São Carlense, 400, 13566-590, São Carlos, Sao Paulo, Brazil
| | - Wentian Fu
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Serhiy Cherevko
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Marc T. M. Koper
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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Spöri C, Briois P, Nong HN, Reier T, Billard A, Kühl S, Teschner D, Strasser P. Experimental Activity Descriptors for Iridium-Based Catalysts for the Electrochemical Oxygen Evolution Reaction (OER). ACS Catal 2019. [DOI: 10.1021/acscatal.9b00648] [Citation(s) in RCA: 94] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Camillo Spöri
- The Electrochemical Catalysis, Energy and Materials Science Laboratory, Department of Chemistry, Technical University Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Pascal Briois
- FEMTO-ST (UMR CNRS 6174), Université de Bourgogne Franche-Comté, UTBM, 90010 Belfort, France
| | - Hong Nhan Nong
- The Electrochemical Catalysis, Energy and Materials Science Laboratory, Department of Chemistry, Technical University Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Tobias Reier
- The Electrochemical Catalysis, Energy and Materials Science Laboratory, Department of Chemistry, Technical University Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Alain Billard
- FEMTO-ST (UMR CNRS 6174), Université de Bourgogne Franche-Comté, UTBM, 90010 Belfort, France
| | - Stefanie Kühl
- The Electrochemical Catalysis, Energy and Materials Science Laboratory, Department of Chemistry, Technical University Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Detre Teschner
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Peter Strasser
- The Electrochemical Catalysis, Energy and Materials Science Laboratory, Department of Chemistry, Technical University Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
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Shan J, Ling T, Davey K, Zheng Y, Qiao SZ. Transition-Metal-Doped RuIr Bifunctional Nanocrystals for Overall Water Splitting in Acidic Environments. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1900510. [PMID: 30811671 DOI: 10.1002/adma.201900510] [Citation(s) in RCA: 184] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 01/30/2019] [Indexed: 05/14/2023]
Abstract
The establishment of electrocatalysts with bifunctionality for efficient oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in acidic environments is necessary for the development of proton exchange membrane (PEM) water electrolyzers for the production of clean hydrogen fuel. RuIr alloy is considered to be a promising electrocatalyst because of its favorable OER performance and potential for HER. Here, the design of a bifunctional electrocatalyst with greatly boosted water-splitting performance from doping RuIr alloy nanocrystals with transition metals that modify electronic structure and binding strength of reaction intermediates is reported. Significantly, Co-RuIr results in small overpotentials of 235 mV for OER and 14 mV for HER (@ 10 mA cm-2 current density) in 0.1 m HClO4 media. Therefore a cell voltage of just 1.52 V is needed for overall water splitting to produce hydrogen and oxygen. More importantly, for a series of M-RuIr (M = Co, Ni, Fe), the catalytic activity dependence at fundamental level on the chemical/valence states is used to establish a novel composition-activity relationship. This permits new design principles for bifunctional electrocatalysts.
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Affiliation(s)
- Jieqiong Shan
- School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Tao Ling
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Kenneth Davey
- School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Yao Zheng
- School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Shi-Zhang Qiao
- School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China
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Decoupling structure-sensitive deactivation mechanisms of Ir/IrOx electrocatalysts toward oxygen evolution reaction. J Catal 2019. [DOI: 10.1016/j.jcat.2019.01.018] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Vos JG, Wezendonk TA, Jeremiasse AW, Koper MTM. MnO x/IrO x as Selective Oxygen Evolution Electrocatalyst in Acidic Chloride Solution. J Am Chem Soc 2018; 140:10270-10281. [PMID: 30024752 PMCID: PMC6099550 DOI: 10.1021/jacs.8b05382] [Citation(s) in RCA: 110] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
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The oxygen evolution reaction (OER)
and chlorine evolution reaction
(CER) are electrochemical processes with high relevance to water splitting
for (solar) energy conversion and industrial production of commodity
chemicals, respectively. Carrying out the two reactions separately
is challenging, since the catalytic intermediates are linked by scaling
relations. Optimizing the efficiency of OER over CER in acidic media
has proven especially difficult. In this regard, we have investigated
the OER versus CER selectivity of manganese oxide (MnOx), a known OER catalyst. Thin films (∼5–20 nm) of MnOx were electrodeposited on glassy carbon-supported hydrous
iridium oxide (IrOx/GC) in aqueous chloride solutions of
pH ∼0.9. Using rotating ring–disk electrode voltammetry
and online electrochemical mass spectrometry, it was found that deposition
of MnOx onto IrOx decreases
the CER selectivity of the system in the presence of 30 mM Cl– from 86% to less than 7%, making it a highly OER-selective
catalyst. Detailed studies of the CER mechanism and ex-situ structure studies using SEM, TEM, and XPS suggest that the MnOx film is in fact not a catalytically active phase, but functions
as a permeable overlayer that disfavors the transport of chloride
ions.
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Affiliation(s)
- Johannes G Vos
- Leiden Institute of Chemistry , Leiden University , PO Box 9502, 2300 RA Leiden , The Netherlands
| | - Tim A Wezendonk
- Delft University of Technology , Julianalaan 136 , 2628 BL Delft , The Netherlands
| | - Adriaan W Jeremiasse
- Magneto Special Anodes (an Evoqua brand) , Calandstraat 109 , 3125 BA Schiedam , The Netherlands
| | - Marc T M Koper
- Leiden Institute of Chemistry , Leiden University , PO Box 9502, 2300 RA Leiden , The Netherlands
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