过电位
塔菲尔方程
X射线光电子能谱
催化作用
析氧
密度泛函理论
化学
电子转移
材料科学
光化学
物理化学
电极
计算化学
物理
核磁共振
生物化学
电化学
作者
Dong He,Xianyin Song,Wenqing Li,Chongyang Tang,Jiangchao Liu,Zunjian Ke,Changzhong Jiang,Xiang Xiao
标识
DOI:10.1002/anie.202001681
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 Co3 O4 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 Co3 O4 has been upshifted, leading to a significantly enhanced absorption capability of the oxo group. The optimized Co3 O4 -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.
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