Efficient oxygen evolution electrocatalysis in acid by a perovskite with face-sharing IrO6 octahedral dimers

Lan Yang, Guangtao Yu, Xuan Ai, Wensheng Yan, Hengli Duan, Wei Chen (), Xiaotian Li, Ting Wang, Chenghui Zhang, Xuri Huang, Jie-Sheng Chen and Xiaoxin Zou ()
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Lan Yang: Jilin University
Guangtao Yu: Jilin University
Xuan Ai: Jilin University
Wensheng Yan: University of Science and Technology of China
Hengli Duan: University of Science and Technology of China
Wei Chen: Jilin University
Xiaotian Li: Jilin University
Ting Wang: Jilin University
Chenghui Zhang: Jilin University
Xuri Huang: Jilin University
Jie-Sheng Chen: Shanghai Jiao Tong University
Xiaoxin Zou: Jilin University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract The widespread use of proton exchange membrane water electrolysis requires the development of more efficient electrocatalysts containing reduced amounts of expensive iridium for the oxygen evolution reaction (OER). Here we present the identification of 6H-phase SrIrO3 perovskite (6H-SrIrO3) as a highly active electrocatalyst with good structural and catalytic stability for OER in acid. 6H-SrIrO3 contains 27.1 wt% less iridium than IrO2, but its iridium mass activity is about 7 times higher than IrO2, a benchmark electrocatalyst for the acidic OER. 6H-SrIrO3 is the most active catalytic material for OER among the iridium-based oxides reported recently, based on its highest iridium mass activity. Theoretical calculations indicate that the existence of face-sharing octahedral dimers is mainly responsible for the superior activity of 6H-SrIrO3 thanks to the weakened surface Ir-O binding that facilitates the potential-determining step involved in the OER (i.e., O* + H2O → HOO* + H+ + e¯).

Date: 2018
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DOI: 10.1038/s41467-018-07678-w

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