Deciphering the Poisoning Effect of Sulfate on a Perovskite-Derived IrOxHy Catalyst for Water Oxidation in Acid

Justin Zhu Yeow Seow; Yubo Chen; Jingjie Ge; Adrian C. Fisher; Zhichuan J. Xu

doi:10.1149/1945-7111/accb70

Deciphering the Poisoning Effect of Sulfate on a Perovskite-Derived IrO_xH_y Catalyst for Water Oxidation in Acid

Justin Zhu Yeow Seow, Yubo Chen, Jingjie Ge, Adrian C. Fisher, Zhichuan J. Xu^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

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 IrO_xH_y 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 SrCo_0.9Ir_0.1O_3-δ-derived IrO_xH_y 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 IrO_xH_y.

Original language	English
Article number	044507
Journal	Journal of the Electrochemical Society
Volume	170
Issue number	4
DOIs	https://doi.org/10.1149/1945-7111/accb70
Publication status	Published - Apr 2023
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2023 The Electrochemical Society (“ECS”). Published on behalf of ECS by IOP Publishing Limited.

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Condensed Matter Physics
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1149/1945-7111/accb70

Cite this

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title = "Deciphering the Poisoning Effect of Sulfate on a Perovskite-Derived IrOxHy Catalyst for Water Oxidation in Acid",

abstract = "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.",

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AU - Fisher, Adrian C.

AU - Xu, Zhichuan J.

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