Three-Dimensional Hierarchical Frameworks Based on MoS2 Nanosheets Self-Assembled on Graphene Oxide for Efficient Electrocatalytic Hydrogen Evolution
Three-Dimensional Hierarchical Frameworks Based on MoS2 Nanosheets Self-Assembled on Graphene Oxide for Efficient Electrocatalytic Hydrogen Evolution
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基于氧化石墨烯上自组装MoS2纳米片的三维分层框架用于高效电催化析氢
DOI：
10.1021/am506545g
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发表时间：
2014
影响因子：
9.5
通讯作者：
Chen Shaowei
中科院分区：
文献类型：
--
作者：
Zhou Weijia;Zhou Kai;Hou Dongman;Liu Xiaojun;Li Guoqiang;Sang Yuanhua;Liu Hong;Li Ligui;Chen Shaowei
用于电催化水分解的先进材料是可再生能源研究的核心。在这项工作中，通过简单的一步水热过程，制备了基于氧化石墨烯上的MoS 2纳米片自组装的三维（3D）分级框架。通过使用各种显微镜和光谱工具，包括扫描和透射电子显微镜、X射线衍射、X射线光电子能谱和拉曼散射，表征所得3D框架的结构。更重要的是，三维MoS 2/石墨烯骨架可以直接用作工作电极，在析氢反应（HER）中表现出明显且稳定的电催化活性，这表现为阴极电流密度大，过电位小，为−107 mV（当加载在玻璃-碳电极上时为-121 mV）和86.3 mV/dec的Tafel斜率（当加载在玻璃-碳电极上时为46.3 mV/dec）。这种优异的性能可能归因于3D框架具有良好的机械强度和高电导率，可用于快速电荷传输和收集，其中氧化石墨烯为MoS 2沉积提供了丰富的成核位点，氧的掺入导致形成了具有HER活性位点的富缺陷MoS 2纳米片。
Advanced materials for electrocatalytic water splitting are central to renewable energy research. In this work, three-dimensional (3D) hierarchical frameworks based on the self-assembly of MoS2nanosheets on graphene oxide were produced via a simple one-step hydrothermal process. The structures of the resulting 3D frameworks were characterized by using a variety of microscopic and spectroscopic tools, including scanning and transmission electron microscopies, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman scattering. Importantly, the three-dimensional MoS2/graphene frameworks might be used directly as working electrodes which exhibited apparent and stable electrocatalytic activity in hydrogen evolution reaction (HER), as manifested by a large cathodic current density with a small overpotential of −107 mV (−121 mV when loaded on a glassy-carbon electrode) and a Tafel slope of 86.3 mV/dec (46.3 mV/dec when loaded on a glassy-carbon electrode). The remarkable performance might be ascribed to the good mechanical strength and high electrical conductivity of the 3D frameworks for fast charge transport and collection, where graphene oxide provided abundant nucleation sites for MoS2deposition and oxygen incorporation led to the formation of defect-rich MoS2nanosheets with active sites for HER.