CoS_2 Yolk-Shell Spheres Coated with Carbon Thin Layers as High Active and Stable Electrocatalysts for Hydrogen Evolution Reaction  

作　　者：Wang Anliang Tong Yexiang Li Gaoren 

机构地区：[1]MOE Laboratory of Bioinorganic and Synthetic Chemistry,The Key Lab of Low-Carbon Chemistry &Energy Conservation of Guangdong Province,School of Chemistry,Sun Yat-Sen University

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2018年第4期619-629,共11页南京航空航天大学学报（英文版）

基　　金：supported by the National Basic Research Program of China(Nos.2015CB932304,2016YFA0202603);the Natural Science Foundation of China (No.91645104);the Natural Science Foundation of Guangdong Province(Nos.S2013020012833,2016A010104004);the Fundamental Research Fund for the Central Universities(No.16lgjc67)

摘　　要：Though water electrolysis is effective in generating high-quality hydrogen gas,it requires effective electrocatalysts for hydrogen evolution reaction(HER).CoS_2 have been considered as a promising HER electrocatalyst because of its high ctalytic activity.However,the key limitation for CoS_2 nanomaterial as HER electrocatalyst is its poor stability,which may be due to the structural breakdown of CoS_2 nanostructure or the evolution of S during H_2 evolution in acid media.Coating porous carbon thin layer for protection from structural breakdown and evolution of S is a good way to improve catalytic stability.In addition,coating carbon layer can change electronic structure of CoS_2 for the moderated hydrogen adsorption energy,leading to enhanced catalytic activity.Here,CoS_2 yolk-shell spheres coated with carbon thin layers exhibit superior catalytic performance for HER with low overpotential,small Tafel slope,and excellent stability.Though water electrolysis is effective in generating high-quality hydrogen gas, it requires effective electrocatalysts forhydrogen evolution reaction （HER）. CoS 2 have been considered as a promising HER electrocatalyst because of its high ctalytic activity. However, the key limitation for CoS 2 nanomaterial as HER electrocatalyst is its poor stability, which may be due to the structural breakdown of CoS 2 nanostructure or the evolution of S during H 2 evolution in acid media. Coating porous carbon thin layer for protection from structural breakdown and evolution of S is a good way to improve catalytic stability. In addition, coating carbon layer can change electronic structure of CoS 2 for the moderated hydrogen adsorption energy, leading to enhanced catalytic ctivity. Here, CoS 2 yolk-shell spheres coated with carbon thin layers exhibit superior catalytic performance for HER with lowoverpotential, small Tafel slope, and excellent stability.

关 键 词：CoS2@C yolk-shell sphere ELECTROCATALYST hydrogen evolution reaction(HER) high stability 

分 类 号：O646[理学—物理化学]