MoS2 Nanoparticles Grown on Graphene: An Advanced Catalyst for the Hydrogen Evolution Reaction
MoS2 Nanoparticles Grown on Graphene: An Advanced Catalyst for the Hydrogen Evolution Reaction
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DOI：
10.1021/ja201269b
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发表时间：
2011-05-18
影响因子：
15
通讯作者：
Dai, Hongjie
中科院分区：
文献类型：
--
作者：
Li, Yanguang;Wang, Hailiang;Dai, Hongjie
电催化和光电化学分解水的先进材料是可再生能源领域的核心。在本工作中，我们发展了一种在溶液中悬浮的还原氧化石墨烯(RGO)薄片上选择性溶剂热合成MoS2纳米颗粒的方法。得到的MoS2/RGO杂化材料具有纳米级的几层MoS2结构，大量暴露的边缘堆积在石墨烯上，这与在溶液中自由生长的大尺寸聚集的MoS2粒子形成了强烈的对比。MoS_2/RGO杂化催化剂在析氢反应(HER)中表现出比其他MoS_2催化剂更好的电催化活性。在HER中首次测量到MoS2催化剂的Tafel斜率接近41 mV/ten；这远远超过了以前MoS2催化剂的活性，这是由于MoS2纳米颗粒上丰富的催化边缘位置以及与底层石墨烯网络的良好电耦合所致。Tafel斜率接近41 mV，表明MoS_2催化HER的机理为Volmer-Heyrovsky，氢的电化学脱附为限速步骤。
Advanced materials for electrocatalytic and photoelectrochemical water splitting are central to the area of renewable energy. In this work, we developed a selective solvothermal synthesis of MoS2 nanoparticles on reduced graphene oxide (RGO) sheets suspended in solution. The resulting MoS2/RGO hybrid material possessed nanoscopic few-layer MoS2 structures with an abundance of exposed edges stacked onto graphene, in strong contrast to large aggregated MoS2 particles grown freely in solution without GO. The MoS2/RGO hybrid exhibited superior electrocatalytic activity in the hydrogen evolution reaction (HER) relative to other MoS2 catalysts. A Tafel slope of similar to 41 mV/decade was measured for MoS2 catalysts in the HER for the first time; this exceeds by far the activity of previous MoS2 catalysts and results from the abundance of catalytic edge sites on the MoS2 nanoparticles and the excellent electrical coupling to the underlying graphene network. The similar to 41 mV/decade Tafel slope suggested the Volmer-Heyrovsky mechanism for the MoS2-catalyzed HER, with electrochemical desorption of hydrogen as the rate-limiting step.