title: Porous metallic MoO2-supported MoS2 nanosheets for enhanced electrocatalytic activity in the hydrogen evolution reaction.
abstract: Advanced materials for electrocatalytic water splitting are central to renewable energy research. In this work, MoS2 nanosheets supported on porous metallic MoO2 (MoS2/MoO2) were produced by sulfuration treatments of porous and highly conductive MoO2 for the hydrogen evolution reaction. Porous MoO2 with one-dimensional channel-like structures was prepared by calcination at elevated temperatures using phosphomolybdic acid as the precursor and mesoporous silica (SBA-15) as the template, and the subsequent hydrothermal treatment in the presence of thioacetamide led to the transformation of the top layers to MoS2 forming MoS2/MoO2 composites. Electrochemical studies showed that the obtained composites exhibited excellent electrocatalytic activity for HER with an onset potential of -104 mV (vs. RHE), a large current density (10 mA cm(-2) at -0.24 V), a small Tafel slope of 76.1 mV dec(-1) and robust electrochemical durability. The performance might be ascribed to the high electrical conductivity and porous structures of MoO2 with one-dimensional channels of 3 to 4 nm in diameter that allowed for fast charge transport and collection.
authors.affiliation: New Energy Research Institute, College of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, Guangdong 510006, China. eszhouwj@scut.edu.cn.
authors.forename: Linjing
authors.initials: L
authors.lastname: Yang
authors.forename: Weijia
authors.initials: W
authors.lastname: Zhou
authors.forename: Dongman
authors.initials: D
authors.lastname: Hou
authors.forename: Kai
authors.initials: K
authors.lastname: Zhou
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Li
authors.forename: Zhenghua
authors.initials: Z
authors.lastname: Tang
authors.forename: Ligui
authors.initials: L
authors.lastname: Li
authors.forename: Shaowei
authors.initials: S
authors.lastname: Chen