Porous amorphous high entropy oxide coated dimensionally stable anode for oxygen evolution reaction in acidic media

[Display omitted] •A novel porous amorphous Ir-based high-entropy oxides-coated DSA is prepared by the general simple thermal decomposition method.•Effects of each element on crystallinity, surface morphology and electronic state of the coating are revealed.•The DSAs exhibit excellent OER catalytic...

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Bibliographic Details
Published inApplied surface science Vol. 684; p. 161882
Main Authors Dai, Wushuai, Wang, Lei, Li, Keyi, Wang, Wei, Bai, Yunlong, Xie, Feng
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2025
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ISSN0169-4332
DOI10.1016/j.apsusc.2024.161882

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Summary:[Display omitted] •A novel porous amorphous Ir-based high-entropy oxides-coated DSA is prepared by the general simple thermal decomposition method.•Effects of each element on crystallinity, surface morphology and electronic state of the coating are revealed.•The DSAs exhibit excellent OER catalytic activity with ultra-low onset potential and Tafel slope.•DSAs have remarkable electrochemical durability and withstand a cumulative 504-hour durability test under the current density of 1000, 2000, and 3000 mA cm−2. Oxygen evolution reaction (OER) has been the subject of considerable attention as a pivotal reaction in the hydrogen production and hydrometallurical electrowinning. Precious metal-coated dimensionally stable anodes (DSAs) have wide applications in electrochemical industry, functioning as high-performance and stable electrocatalysts for OER. Given the broad development prospects opened up by the advocacy of green energy, the key to the electrochemical industry lies in improving the catalytic performance and durability of DSA. In this study, a novel porous amorphous Ir-based high-entropy oxides-coated DSA was prepared by thermal decomposition method, and its OER activity and durability in acidic media were investigated. The Ir-based high-entropy oxides coatings exhibit a hierarchical porous morphology at the surface, coupled with an amorphous structure. The coatings display a high proportion of Ir3+, unsaturated bonds and oxygen vacancies/hydroxyl groups, which collectively impart excellent OER activity. The achievement of current densities of 10 and 100 mA cm−2 at potentials of 1.45 and 1.51 V vs. RHE in 0.5 mol L−1 H2SO4 solution represents a significant outcome. The coatings demonstrated remarkable electrochemical durability without decay after 5000 cycles and are able to withstand a cumulative 504-hour durability test under the current density of 1000, 2000, and 3000 mA cm−2.
ISSN:0169-4332
DOI:10.1016/j.apsusc.2024.161882