Abstract
Efficient electrocatalysts are vital to large-cur-rent hydrogen production in commercial water splitting for green energy generation.Herein,a novel heterophase engineering strategy is described to produce polymorphic CoSe2 electrocatalysts.The composition of the electrocat-alysts consisting of both cubic CoSe2(c-CoSe2)and orthorhombic CoSe2(o-CoSe2)phases can be controlled precisely.Our results demonstrate that junction-induced spin-state modulation of Co atoms enhances the adsorption of intermediates and accelerates charge transfer resulting in superior large-current hydrogen evolution reaction(HER)properties.Specifically,the CoSe2-based heterophase cat-alyst with the optimal c-CoSe2 content requires an over-potential of merely 240 mV to achieve 1,000 mA·cm-2 as well as a Tafel slope of 50.4 mV·dec-1.Furthermore,the electrocatalyst can maintain a large current density of 1,500 mA·cm-2 for over 320 h without decay.The results reveal the advantages and potential of heterophase junction engineering pertaining to design and fabrication of low-cost transition metal catalysts for large-current water splitting.
基金项目
国家自然科学基金(52002294)
国家自然科学基金(52202111)
湖北省重点研发计划(2021BAA208)
Knowledge Innovation Program of Wuhan-Shuguang Project(2022010801020364)
City University of Hong Kong Donation Research Grant(DON-RMG 9229021)
City University of Hong Kong Donation Grant(9220061)
City University of Hong Kong Strategic Research Grant(SRG)(7005505)
NETL
NSTL
万方数据