A Cake-Style CoS₂@MoS₂/RGO Hybrid Catalyst for Efficient Hydrogen Evolution

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• 作者：Yaxiao Guo ; Linfeng Gan ; Changshuai Shang ; Erkang Wang and Jin Wang
• 刊名：Advanced Functional Materials
• 出版年：2017
• 出版时间：February 3, 2017
• 年：2017
• 卷：27
• 期：5
• 全文大小：1100K
• ISSN：1616-3028

文摘

A three-tiered cake-style composite is elaborately established, with the characteristic of a double-deck of MoS₂ nanosheets and reduction of graphene oxide (RGO) sheets dotted with CoS₂ nanoparticles (CoS₂@MoS₂/RGO). Because of the prominent synergistic effect of graphene acting as conductive support, MoS₂ and CoS₂ providing abundant catalytically active sites, and the cake-style structure promoting mechanical stability, the CoS₂@MoS₂/RGO exhibits a superior hydrogen evolution reaction activity with a small overpotential of 98 mV at cathodic current density of 10 mA cm⁻², and a small Tafel slope of 37.4 mV dec⁻¹, as well as excellent cycling stability. Density functional theory calculations reveal that the hydrogen adsorption free energy of CoS₂@MoS₂/RGO is close to zero.