首页|Modulation of d-orbital to realize enriched electronic cobalt sites in cobalt sulfide for enhanced hydrogen evolution in electrocatalytic water/seawater splitting
Modulation of d-orbital to realize enriched electronic cobalt sites in cobalt sulfide for enhanced hydrogen evolution in electrocatalytic water/seawater splitting
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Herein,a novel single-atomic Pt doping and interface-rich CoS/Co(OH)2(Pt-CoS/Co(OH)2/C)electro-catalyst has been successfully prepared.Benefiting from precise regulation of d-orbital electronic structure modu-lation on Co site,Pt-CoS/Co(OH)2/C exhibited remarkable HER activity and high stability for hydrogen evolution in splitting both water(73 mV@10 mA.cm-2)and seawater(87 mV@10 mA.cm-2).Notably,atomic Pt doping was introduced into CoS/Co(OH)2,which could produce local unbalanced Coulombic force and significantly increased the number of S vacancies,and then expose abundant Co sites.Meantime,Co(OH)2 in Pt-CoS/Co(OH)2/C could act as the adsorption sites for H2O in hydrogen evolution reaction process.Density functional theory results also proved that atomic Pt doping,S vacancies and Co(OH)2 coupling could result in the formation of enriched elec-tronic Co sites and optimize dz2 orbital electronic structure,and then realize the depth upward shift of d-band center and enhance the adsorption of H*on Co sites.
Jian-Peng Sun、Yu Zheng、Zi-Sheng Zhang、Xiang-Chao Meng、Zi-Zhen Li
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Key Laboratory of Marine Chemistry Theory and Technology (Ministry of Education),College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China
Shanxi Institute of Energy,Taiyuan 030600,China
Department of Chemical and Biological Engineering,Faculty of Engineering,University of Ottawa,Ottawa,ON K1N6 N5,Canada
山东省自然科学基金Taishan Scholars Foundation of Shandong provinceShiyanjia Lab
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