Extremely Active and Robust Ir−Mn Dual‐Atom Electrocatalyst for Oxygen Evolution Reaction by Oxygen‐Oxygen Radical Coupling Mechanism

Author:

Liu Wenbo1,Long Guifa2,Xiang Zhipeng1,Ren Tianlu1,Piao Jinhua3,Wan Kai1,Fu Zhiyong1,Liang Zhenxing145ORCID

Affiliation:

1. Guangdong Provincial Key Laboratory of Fuel Cell Technology School of Chemistry and Chemical Engineering South China University of Technology 510641 Guangzhou P. R. China

2. Guangxi Key Laboratory of Chemistry and Engineering of Forest Products School of Chemistry and Chemical Engineering Guangxi Minzu University 530008 Nanning P. R. China

3. School of Food Science and Engineering South China University of Technology 510641 Guangzhou P. R. China

4. State Key Laboratory of Pulp and Paper Engineering South China University of Technology 510641 Guangzhou China

5. Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center 522000 Jieyang Guangdong China

Abstract

AbstractA novel Ir−Mn dual‐atom electrocatalyst is synthesized by a facile ion‐exchange method by incorporating Ir in SrMnO3, which yields an extremely high activity and stability for the oxygen evolution reaction (OER). The ion exchange process occurs in a self‐limitation way, which favors the formation of Ir−Mn dual‐atom in the IrMnO9 unit. The incorporation of Ir modulates the electronic structure of both Ir and Mn, thereby resulting in a shorter distance of the Ir−Mn dual‐atom (2.41 Å) than the Mn−Mn dual‐atom (2.49 Å). The modulated Ir−Mn dual‐atom enables the same spin direction O (↑) of the adsorbed *O intermediates, thus facilitating the direct coupling of the two adsorbed *O intermediates to release O2 via the oxygen‐oxygen radical coupling mechanism. Electrochemical tests reveal that the Ir‐SrMnO3 exhibits a superior OER's activity with a low overpotential of 207 mV at 10 mA cm−2 and achieves a mass specific activity of 1100 A gIr−1 at 1.5 V. The proton‐exchange‐membrane water electrolyzer with the Ir‐SrMnO3 catalyst exhibits a low electrolysis voltage of 1.63 V at 1.0 A cm−2 and a stable 2000‐h operation with a decay of only 15 μV h−1 at 0.5 A cm−2.

Publisher

Wiley

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