Iridium metallene oxide for acidic oxygen evolution catalysis
Qian Dang1,2,3,6, Haiping Lin2,6, Zhenglong Fan2,6, Lu Ma4,6, Qi Shao 1,*（邵琪）, Yujin Ji2, Fangfang Zheng2, Shize Geng1,2, Shi-Ze Yang 5,*, Ningning Kong2, Wenxiang Zhu2, Youyong Li 2,*（李有勇）, Fan Liao2, Xiaoqing Huang 3,*（黄小青） & Mingwang Shao2,*（邵名望）
1 College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Jiangsu, P. R. China.
2 Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 215123 Jiangsu, P. R. China.
3 State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, 361005 Xiamen, P. R. China.
4 NSLS-II, Brookhaven National Laboratory, Upton, NY 11973, USA.
5 Eyring Materials Center, Arizona State University, Tempe, AZ 85287, USA.
6 These authors contributed equally: Qian Dang, Haiping Lin, Zhenglong Fan, Lu Ma.
NATURE COMMUNICATIONS (2021) 12:6007
Exploring new materials is essential in the fifield 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.
链接：//www.nature.com/articles/s41467-021-26336-2.pdf
