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Highly active postspinel-structured catalysts for oxygen evolution reaction.

ABSTRACT: The rational design principle of highly active catalysts for the oxygen evolution reaction (OER) is desired because of its versatility for energy-conversion applications. Postspinel-structured oxides, CaB ₂O₄ (B = Cr³⁺, Mn³⁺, and Fe³⁺), have exhibited higher OER activities than nominally isoelectronic conventional counterparts of perovskite oxides LaBO₃ and spinel oxides ZnB ₂O₄. Electrochemical impedance spectroscopy reveals that the higher OER activities for CaB ₂O₄ series are attributed to the lower charge-transfer resistances. A density-functional-theory calculation proposes a novel mechanism associated with lattice oxygen pairing with adsorbed oxygen, demonstrating the lowest theoretical OER overpotential than other mechanisms examined in this study. This finding proposes a structure-driven design of electrocatalysts associated with a novel OER mechanism.

SUBMITTER: Okazaki Y

PROVIDER: S-EPMC8981248 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature

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Highly active postspinel-structured catalysts for oxygen evolution reaction.

Okazaki Yuichi Y Oda Seiji S Takamatsu Akihiko A Kawaguchi Shogo S Tsukasaki Hirofumi H Mori Shigeo S Yagi Shunsuke S Ikeno Hidekazu H Yamada Ikuya I

RSC advances 20220210 9

The rational design principle of highly active catalysts for the oxygen evolution reaction (OER) is desired because of its versatility for energy-conversion applications. Postspinel-structured oxides, CaB 2O4 (B = Cr3+, Mn3+, and Fe3+), have exhibited higher OER activities than nominally isoelectronic conventional counterparts of perovskite oxides LaBO3 and spinel oxides ZnB 2O4. E ...[more]

PMID: 35425573

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