Yang Linjing, Zhou Weijia, Hou Dongman, Zhou Kai, Li Guoqiang, Tang Zhenghua, Li Ligui, Chen Shaowei
New Energy Research Institute, College of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, Guangdong 510006, China.
Nanoscale. 2015 Mar 12;7(12):5203-8. doi: 10.1039/c4nr06754a.
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.
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，通过对多孔且高导电的MoO₂进行硫化处理，制备了负载在多孔金属MoO₂上的MoS₂纳米片（MoS₂/MoO₂）用于析氢反应。以磷钼酸为前驱体、介孔二氧化硅（SBA-15）为模板，通过高温煅烧制备了具有一维通道状结构的多孔MoO₂，随后在硫代乙酰胺存在下进行水热处理，导致顶层转变为MoS₂，形成MoS₂/MoO₂复合材料。电化学研究表明，所制备的复合材料对析氢反应表现出优异的电催化活性，起始电位为 -104 mV（相对于可逆氢电极），具有较大的电流密度（在 -0.24 V时为10 mA cm⁻²），较小的塔菲尔斜率为76.1 mV dec⁻¹，并且具有良好的电化学耐久性。这种性能可能归因于MoO₂的高电导率和具有直径为3至4 nm的一维通道的多孔结构，该结构允许快速的电荷传输和收集。
