Active Electron Density Modulation of Co3O4-Based Catalysts Enhances their Oxygen Evolution Performance

被引:227
作者
He, Dong [1 ]
Song, Xianyin [1 ]
Li, Wenqing [1 ]
Tang, Chongyang [1 ]
Liu, Jiangchao [1 ]
Ke, Zunjian [1 ]
Jiang, Changzhong [1 ]
Xiao, Xiangheng [1 ]
机构
[1] Wuhan Univ, Hubei Nucl Solid Phys Key Lab, Key Lab Artificial Micro & Nanostruct, Dept Phys,Minist Educ, Wuhan 430072, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
active electron modulation; Co3O4; ion irradiation; oxo group; oxygen evolution reaction; HYDROGEN EVOLUTION; WATER OXIDATION; NANOSHEETS; EFFICIENT; VACANCIES; SURFACE;
D O I
10.1002/anie.202001681
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Despite the fact that many strategies have been developed to improve the efficiency of the oxygen evolution reaction (OER), the precise modulation of the surface electronic properties of catalysts to improve their catalytic activity is still challenging. Herein, we demonstrate that the surface active electron density of Co3O4 can be effectively regulated by an argon-ion irradiation method. X-ray photoelectron and synchrotron x-ray absorption spectroscopy, UV photoelectron spectrometry, and DFT calculations show that the surface active electron density band center of Co3O4 has been upshifted, leading to a significantly enhanced absorption capability of the oxo group. The optimized Co3O4-based catalysts exhibit an excellent overpotential of 260 mV at 10 mA cm(-2) and Tafel slope of 54 mV dec(-1), superior to the capability of the benchmark RuO2, representing one of the best Co-based OER catalysts. This approach could guide the future rational design and discovery of ideal electrocatalysts.
引用
收藏
页码:6929 / 6935
页数:7
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