Deciphering the poisoning effect of sulfate on a perovskite-derived IrOxHy catalyst for water oxidation in acid
A highly efficient and stable oxygen evolution reaction (OER) plays a key role in the commercialization of proton exchange membrane (PEM) water electrolyzers. Perovskite-derived IrOxHy catalysts have been demonstrated to be highly catalytically active in a harsh acidic environment. On the other hand...
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sg-ntu-dr.10356-1692982023-07-11T15:37:48Z Deciphering the poisoning effect of sulfate on a perovskite-derived IrOxHy catalyst for water oxidation in acid Seow, Justin Zhu Yeow Chen,Yubo Ge, Jingjie Fisher, Adrian C. Xu, Jason Zhichuan Interdisciplinary Graduate School (IGS) School of Materials Science and Engineering Energy Research Institute @ NTU (ERI@N) Engineering::Materials Catalyst Poisoning Electrocatalysts A highly efficient and stable oxygen evolution reaction (OER) plays a key role in the commercialization of proton exchange membrane (PEM) water electrolyzers. Perovskite-derived IrOxHy catalysts have been demonstrated to be highly catalytically active in a harsh acidic environment. On the other hand, the inevitable degradation of the PEM can induce the release of sulfate ions, which could poison electrocatalysts. Herein, the poisoning effects of sulfate ions on a representative SrCo0.9Ir0.1O3-δ-derived IrOx Hy catalyst and a standard IrO2 are studied. It is found that, besides sulfate ion adsorption on Ir active sites impacting both Ir-based catalysts, SrSO4 precipitation is the most prominent cause of activity degradation of IrOxHy. This phenomenon is unique to a reconstructed surface undergoing continuous cation leaching from the perovskite-oxyhydroxide interface, in which SrSO4 precipitate blocks electrolyte-accessible IrOxHy-walled channels, preventing further Sr and Co ion leaching from the interface and dehydrating the isolated portion of the blocked channels, resulting in a reduction in the number of Ir active sites and causing the catalyst to have an OER performance stability inferior to commercial IrO2 Ministry of Education (MOE) National Research Foundation (NRF) Submitted/Accepted version This work is supported by the Singapore MOE Tier 2 grant (MOET2EP10220–0001), Tier 1 grant (RG62/21), and the Singapore National Research Foundation under its Campus for Research Excellence and Technological Enterprise (CREATE) programme. 2023-07-11T07:24:16Z 2023-07-11T07:24:16Z 2023 Journal Article Seow, J. Z. Y., Chen, Y., Ge, J., Fisher, A. C. & Xu, J. Z. (2023). Deciphering the poisoning effect of sulfate on a perovskite-derived IrOxHy catalyst for water oxidation in acid. Journal of the Electrochemical Society, 170(4), 044507-. https://dx.doi.org/10.1149/1945-7111/accb70 0013-4651 https://hdl.handle.net/10356/169298 10.1149/1945-7111/accb70 2-s2.0-85153491019 4 170 044507 en MOE-T2EP10220–0001 RG62/21 Journal of the Electrochemical Society © 2023 The Electrochemical Society. All rights reserved. This is the Accepted Manuscript version of an article accepted for publication in Journal of the Electrochemical Society. The Electrochemical Society and IOP Publishing Ltd are not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at DOI 10.1149/1945-7111/accb70. application/pdf |
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Engineering::Materials Catalyst Poisoning Electrocatalysts Seow, Justin Zhu Yeow Chen,Yubo Ge, Jingjie Fisher, Adrian C. Xu, Jason Zhichuan Deciphering the poisoning effect of sulfate on a perovskite-derived IrOxHy catalyst for water oxidation in acid |
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A highly efficient and stable oxygen evolution reaction (OER) plays a key role in the commercialization of proton exchange membrane (PEM) water electrolyzers. Perovskite-derived IrOxHy catalysts have been demonstrated to be highly catalytically active in a harsh acidic environment. On the other hand, the inevitable degradation of the PEM can induce the release of sulfate ions, which could poison electrocatalysts. Herein, the poisoning effects of sulfate ions on a representative SrCo0.9Ir0.1O3-δ-derived IrOx Hy catalyst and a standard IrO2 are studied. It is found that, besides sulfate ion adsorption on Ir active sites impacting both Ir-based catalysts, SrSO4 precipitation is the most prominent cause of activity degradation of IrOxHy. This phenomenon is unique to a reconstructed surface undergoing continuous cation leaching from the perovskite-oxyhydroxide interface, in which SrSO4 precipitate blocks electrolyte-accessible IrOxHy-walled channels, preventing further Sr and Co ion leaching from the interface and dehydrating the isolated portion of the blocked channels, resulting in a reduction in the number of Ir active sites and causing the catalyst to have an OER performance stability inferior to commercial IrO2 |
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Interdisciplinary Graduate School (IGS) |
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Interdisciplinary Graduate School (IGS) Seow, Justin Zhu Yeow Chen,Yubo Ge, Jingjie Fisher, Adrian C. Xu, Jason Zhichuan |
format |
Article |
author |
Seow, Justin Zhu Yeow Chen,Yubo Ge, Jingjie Fisher, Adrian C. Xu, Jason Zhichuan |
author_sort |
Seow, Justin Zhu Yeow |
title |
Deciphering the poisoning effect of sulfate on a perovskite-derived IrOxHy catalyst for water oxidation in acid |
title_short |
Deciphering the poisoning effect of sulfate on a perovskite-derived IrOxHy catalyst for water oxidation in acid |
title_full |
Deciphering the poisoning effect of sulfate on a perovskite-derived IrOxHy catalyst for water oxidation in acid |
title_fullStr |
Deciphering the poisoning effect of sulfate on a perovskite-derived IrOxHy catalyst for water oxidation in acid |
title_full_unstemmed |
Deciphering the poisoning effect of sulfate on a perovskite-derived IrOxHy catalyst for water oxidation in acid |
title_sort |
deciphering the poisoning effect of sulfate on a perovskite-derived iroxhy catalyst for water oxidation in acid |
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2023 |
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https://hdl.handle.net/10356/169298 |
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1772828766854184960 |