MoSx supported graphene oxides with different degree of oxidation as efficient electrocatalysts for hydrogen evolution

被引:97
|
作者
Hu, Wen-Hui [1 ]
Shang, Xiao [1 ]
Han, Guan-Qun [1 ,2 ]
Dong, Bin [1 ,2 ]
Liu, Yan-Ru [1 ]
Li, Xiao [1 ]
Chai, Yong-Ming [1 ]
Liu, Yun-Qi [1 ]
Liu, Chen-Guang [1 ]
机构
[1] China Univ Petr East China, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China
[2] China Univ Petr East China, Coll Sci, Qingdao 266580, Peoples R China
基金
中国国家自然科学基金;
关键词
CARBON NANOSPHERES; FACILE SYNTHESIS; CATALYST; HYBRID; NANOPARTICLES; NANOSHEETS; GENERATION; GROWTH; SITES;
D O I
10.1016/j.carbon.2016.01.019
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A simple wet chemical method has been used to prepare MoSx in situ grown on graphene oxide (MoSx/GO) as a highly active and stable electrocatalyst for hydrogen evolution reaction (HER). The role of the oxygen-containing functional group on the surface of GO with different oxidation degrees have been studied for obtaining MoSx/GO with excellent electrochemical activity for HER. The electrochemical measurements show that MoSx/GO using the medium degree of oxidation of GO as matrix exhibits best electrocatalytic activity for HER with a small overpotential of similar to 195 mV at the current density of 20 mA cm(-2). A tafel slope of similar to 47.7 mV per decade is obtained for MoSx/GO modified electrode. The turnover frequency per active site is calculated. Both the amount of active sites for HER and conductivity of the electrocatalyst have been greatly improved owing to the good dispersion and conductivity provided by GO matrix. Therefore, this work suggested that choosing GO with suitable oxidation degree as support is the key for synthesizing MoSx based electrocatalysts with enhanced HER activity. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:236 / 242
页数:7
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