Highly active postspinel-structured catalysts for oxygen evolution reaction. Issue 9 (10th February 2022)

• Record Type: Journal Article
• Authors: Okazaki, Yuichi; Oda, Seiji; Takamatsu, Akihiko; Kawaguchi, Shogo; Tsukasaki, Hirofumi; Mori, Shigeo; Yagi, Shunsuke; Ikeno, Hidekazu; Yamada, Ikuya
• Is Part Of: RSC advances. Volume 12:Issue 9(2022)
• Page Start: 5094
• Page End: 5104
• Publication Date: 2022-02-10
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra00448h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Postspinel-structured oxides, Ca B 2 O4 ( B = Cr 3+, Mn 3+, and Fe 3+ ), have exhibited systematically higher catalytic activities in the oxygen evolution reaction (OER) than nominally conventional counterparts of perovskite La B O3 and spinel Zn B 2 O4 . 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, Ca B 2 O4 ( B = Cr 3+, Mn 3+, and Fe 3+ ), have exhibited higher OER activities than nominally isoelectronic conventional counterparts of perovskite oxides La B O3 and spinel oxides Zn B 2 O4 . Electrochemical impedance spectroscopy reveals that the higher OER activities for Ca B 2 O4 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.