Iridium oxide nanoribbons with metastable monoclinic phase for highly efficient electrocatalytic oxygen evolution

Fan Liao, Kui Yin, Yujin Ji, Wenxiang Zhu, Zhenglong Fan, Youyong Li, Jun Zhong, Mingwang Shao, Zhenhui Kang and Qi Shao ()
Additional contact information
Fan Liao: Soochow University
Kui Yin: Soochow University
Yujin Ji: Soochow University
Wenxiang Zhu: Soochow University
Zhenglong Fan: Soochow University
Youyong Li: Soochow University
Jun Zhong: Soochow University
Mingwang Shao: Soochow University
Zhenhui Kang: Soochow University
Qi Shao: Soochow University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Metastable metal oxides with ribbon morphologies have promising applications for energy conversion catalysis, however they are largely restricted by their limited synthesis methods. In this study, a monoclinic phase iridium oxide nanoribbon with a space group of C2/m is successfully obtained, which is distinct from rutile iridium oxide with a stable tetragonal phase (P42/mnm). A molten-alkali mechanochemical method provides a unique strategy for achieving this layered nanoribbon structure via a conversion from a monoclinic phase K0.25IrO2 (I2/m (12)) precursor. The formation mechanism of IrO2 nanoribbon is clearly revealed, with its further conversion to IrO2 nanosheet with a trigonal phase. When applied as an electrocatalyst for the oxygen evolution reaction in acidic condition, the intrinsic catalytic activity of IrO2 nanoribbon is higher than that of tetragonal phase IrO2 due to the low d band centre of Ir in this special monoclinic phase structure, as confirmed by density functional theory calculations.

Date: 2023
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DOI: 10.1038/s41467-023-36833-1

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