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  Preparation of Solid Solution and Layered IrO x-Ni(OH)2Oxygen Evolution Catalysts: Toward Optimizing Iridium Efficiency for OER

Ruiz Esquius, J., Algara-Siller, G., Spanos, I., Freakley, S. J., Schlögl, R., & Hutchings, G. J. (2020). Preparation of Solid Solution and Layered IrO x-Ni(OH)2Oxygen Evolution Catalysts: Toward Optimizing Iridium Efficiency for OER. ACS Catalysis, 10(24), 14640-14648. doi:10.1021/acscatal.0c03866.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-A331-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-A332-8
Genre: Journal Article

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 Creators:
Ruiz Esquius, J.1, Author
Algara-Siller, Gerardo2, Author              
Spanos, Ioanis3, Author
Freakley, S. J.1, 4, Author
Schlögl, Robert2, 3, Author              
Hutchings, G. J.1, Author
Affiliations:
1Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom, ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
3Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, Mulheim an der Ruhr, 45470, Germany, ou_persistent22              
4Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 2AY, United Kingdom, ou_persistent22              

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 Abstract: Minimizing iridium loading in oxygen evolution reaction (OER) catalysts, without impairing electrocatalytic activity and stability is crucial to reduce the cost of water electrolysis. In this work, two Ir0.5Ni0.5Oxmixed oxide catalysts with layered and solid solution morphologies were prepared by modifying a facile hydrothermal methodology. The catalytic OER activity and stability of the Ir-Ni catalyst with a homogeneous distribution (IrNi-HD) was seriously compromised compared to pure IrOx due to the high concentration of surface nickel prone to corrosion under reaction conditions. However, the design of layered IrOx-Ni(OH)x (IrNi-LY) with Ir at the exposed surface allowed a 50% reduction in the molar concentration of the precious metal on the electrode compared to IrOx without impairing the catalytic activity or stability. As a result, IrNi-LY outperformed IrOx in activity when normalized to the Ir mass.

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Language(s): eng - English
 Dates: 2020-09-042020-11-262020-12-18
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acscatal.0c03866
 Degree: -

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Title: ACS Catalysis
  Abbreviation : ACS Catal.
Source Genre: Journal
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Publ. Info: Washington, DC : ACS
Pages: 9 Volume / Issue: 10 (24) Sequence Number: - Start / End Page: 14640 - 14648 Identifier: ISSN: 2155-5435
CoNE: https://pure.mpg.de/cone/journals/resource/2155-5435