标题：Three-Dimensional Hierarchical Frameworks Based on MoS2 Nanosheets Self-Assembled on Graphene Oxide for Efficient Electrocatalytic Hydrogen Evolution
作者：Zhou, Weijia;Zhou, Kai;Hou, Dongman;Liu, Xiaojun;Li, Guoqiang;Sang, Yuanhua;Liu, Hong;Li, Ligui;Chen, Shaowei
作者机构：[Zhou, W] New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong, 510006, China;[ 更多
通讯作者地址：[Zhou, WJ]S China Univ Technol, Guangzhou Higher Educ Mega Ctr, Sch Environm & Energy, New Energy Res Inst, Guangzhou 510006, Guangdong, Peoples R Chi 更多
来源：ACS applied materials & interfaces
关键词：MoS2 nanosheet;graphene oxide;hydrothermal;three-dimensional framework;electrocatalytic;hydrogen evolution reaction
摘要：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 MoS2 nanosheets 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 MoS2 deposition and oxygen incorporation led to the formation of defect-rich MoS2 nanosheets with active sites for HER.