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Selenium vacancy triggered atomic disordering of Co0.85Se nanoparticles towards a highly-active electrocatalyst for
Jiahao Zhang1, Qiucheng Xu, Yanjie Hu
1Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China. jianghao@ecust.edu.cn.
Abstract:
Selenium vacancy engineering has been realized in Co0.85Se nanoparticles via an anoxic melting strategy, where the vacancy content can be continuously controlled to modulate atomic disordering. The resulting Co0.85Se-30 catalyst requires a super low overpotential of 243 mV to achieve 10 mA cm-2 for the OER with a Tafel slope of 45.5 mV dec-1 and 70 h stability. In-depth electrochemical analysis finds that the outstanding properties are chiefly attributed to the dynamic Co-centers, giving the highest intrinsic activity (jCo = 6.49 A g-1 at η = 270 mV) and lowest apparent activation energy (42.43 kJ mol-1).
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