One-Step Scalable Production of Co1− x S/Graphene Nanocomposite as High-Performance Bifunctional Electrocatalyst

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• 作者：Yuqi Xu ; Yongchao Hao ; Guoxin Zhang ; Xiuyan Jin ; Lin Wang ; Zhiyi Lu and Xiaoming Sun
• 刊名：Particle & Particle Systems Characterization
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：33
• 期：8
• 页码：569-575
• 全文大小：2092K
• ISSN：1521-4117

文摘

Herein, a strategy for one-step fabrication of cobalt sulfide/graphene (Co_1−xS/G) nanocomposite as bifunctional catalyst for oxygen catalysis is demonstrated. The one-step fabrication method involves annealing the mixture of cobalt salt, thioacetamide, and graphene oxide with the assistance of small amount of glycol without any further purification steps. The Co_1−xS/G shows a morphology with small-sized Co_1−xS nanocrystals strongly and uniformly anchored on the graphene surface. Systematically electrochemical studies demonstrate that the Co_1−xS/G with optimized components shows superior catalytic activities toward oxygen reduction and oxygen evolution, which are comparable or even superior to commercial Pt/C and Ir/C catalysts. As a result, the potential hysteresis of Co_1−xS/G is the lowest among all the samples. The facile operability of the fabrication method and the high bifunctional activity of Co_1−xS/G may pave one practical way for broad applications including fuel cell, metal-O₂ battery, and water electrolysis.