Iridium metallene oxide for acidic oxygen evolution catalysis

Qian Dang, Haiping Lin, Zhenglong Fan, Lu Ma, Qi Shao (), Yujin Ji, Fangfang Zheng, Shize Geng, Shi-Ze Yang (), Ningning Kong, Wenxiang Zhu, Youyong Li (), Fan Liao, Xiaoqing Huang () and Mingwang Shao ()
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Qian Dang: Soochow University
Haiping Lin: Soochow University
Zhenglong Fan: Soochow University
Lu Ma: NSLS-II, Brookhaven National Laboratory
Qi Shao: Soochow University
Yujin Ji: Soochow University
Fangfang Zheng: Soochow University
Shize Geng: Soochow University
Shi-Ze Yang: Arizona State University
Ningning Kong: Soochow University
Wenxiang Zhu: Soochow University
Youyong Li: Soochow University
Fan Liao: Soochow University
Xiaoqing Huang: Xiamen University
Mingwang Shao: Soochow University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Exploring new materials is essential in the field of material science. Especially, searching for optimal materials with utmost atomic utilization, ideal activities and desirable stability for catalytic applications requires smart design of materials’ structures. Herein, we report iridium metallene oxide: 1 T phase-iridium dioxide (IrO2) by a synthetic strategy combining mechanochemistry and thermal treatment in a strong alkaline medium. This material demonstrates high activity for oxygen evolution reaction with a low overpotential of 197 millivolt in acidic electrolyte at 10 milliamperes per geometric square centimeter (mA cmgeo−2). Together, it achieves high turnover frequencies of 4.2 sUPD−1 (3.0 sBET−1) at 1.50 V vs. reversible hydrogen electrode. Furthermore, 1T-IrO2 also shows little degradation after 126 hours chronopotentiometry measurement under the high current density of 250 mA cmgeo−2 in proton exchange membrane device. Theoretical calculations reveal that the active site of Ir in 1T-IrO2 provides an optimal free energy uphill in *OH formation, leading to the enhanced performance. The discovery of this 1T-metallene oxide material will provide new opportunities for catalysis and other applications.

Date: 2021
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DOI: 10.1038/s41467-021-26336-2

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