Cobalt sulfides as efficient catalyst towards oxygen reduction reactions  

作　　者：Shuo Yao Taizhong Huang Hengyi Fang Jiemei Yu Mayilvel Dinesh Meganathan Zhaoxin Cui Xianxia Yuan 

机构地区：[1]Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials,School of Chemistry and Chemical Engineering,University of Jinan,Ji'nan 250022,China [2]Department of Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Chinese Chemical Letters》2020年第2期530-534,共5页中国化学快报（英文版）

基　　金：financially supported National Natural Science Foundation of China(No.21476138);Shandong Provincial Natural Science Foundation(No.ZR2018MB036);Science Development Project of Shandong Province(Nos.2017GGX40115 and2016GGX102038);Project of Shandong Province Higher Educational Science and Technology Program(Nos.J17KA094,J13LD08)。

摘　　要：Developing low-cost and high performance catalysts to replace precious metal based catalysts for oxygen reduction reaction(ORR) is one of the most feasible ways to promote the commercial application of fuel cells.In this work,flower-like CoS and octahedral CoS_2 are synthesized by a facile one-pot hydrothermal method without any adjunction of surfactants or follow-up thermolysis,their catalytic performance towards ORR in alkaline electrolyte are comparatively investigated.The results reveal that CoS_2 outperforms CoS owing to the higher electron density around S-S bond of S_2^(2-) in the crystal structure,which promotes the adsorption of oxygen on catalyst surface and facilitates the breakage of O-O bond in oxygen,leading to direct 4-electron transfer ORR.When CoS_2 particles are dispersed on the surface of rGO with large surface area,their ORR performance could be further improved.Developing low-cost and high performance catalysts to replace precious metal based catalysts for oxygen reduction reaction（ORR） is one of the most feasible ways to promote the commercial application of fuel cells.In this work,flower-like CoS and octahedral CoS2 are synthesized by a facile one-pot hydrothermal method without any adjunction of surfactants or follow-up thermolysis,their catalytic performance towards ORR in alkaline electrolyte are comparatively investigated.The results reveal that CoS2 outperforms CoS owing to the higher electron density around S-S bond of S22- in the crystal structure,which promotes the adsorption of oxygen on catalyst surface and facilitates the breakage of O-O bond in oxygen,leading to direct 4-electron transfer ORR.When CoS2 particles are dispersed on the surface of rGO with large surface area,their ORR performance could be further improved.

关 键 词：OXYGEN reduction reaction CATALYSTS COBALT sulfides REDUCED graphene OXIDE CATALYTIC performance 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.36[理学—物理化学]