Preparation of MoS2/TixOy catalysts via a one-pot solvothermal method for electrocatalytic water splitting to produce hydrogen
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摘要: 通过水热法一步合成了系列二硫化钼/亚氧化钛（MoS2/TixOy）复合催化剂，研究了溶剂、硫源和钼源等合成条件对所合成的催化剂电催化析氢活性的影响以及亚氧化钛的作用。结果表明，溶剂、硫源、钼源、亚氧化钛等因素都对催化剂的结构和电解水析氢性能有重要影响。溶剂水、水解可产生铵根离子的硫源和钼源以及亚氧化钛的加入有利于获得具有高析氢活性的催化剂。其中，以水为溶剂、硫代乙酰胺为硫源、钼酸铵为钼源得到的催化剂析氢活性最高，电解水析氢测试中达到10 mA/cm2电流密度时需要的过电势仅为280 mV。Abstract: A series of MoS2/TixOy catalysts were prepared by a one pot solvothermal synthesis method and the effects of solvent, sulfur source, molybdenum source and titanium subdioxide conductive agent on the electrocatalytic activity of MoS2/TixOy in hydrogen evolution from water splitting were investigated. The results showed that the crystal structure of MoS2/TixOy catalyst as well as its catalytic performance is greatly influenced by the solvent, sulfur source, molybdenum source and titanium subdioxide conductive agent. Water, sulfur and molybdenum sources which can produce ammonium ions via hydrolysis, and the conductive agents are beneficial to improving the hydrogen evolution activity of the MoS2/TixOy catalyst in water splitting. In particular, with water as the solvent, thioacetamide and ammonium molybdate as the sulfur and molybdenum sources, respectively, the MoS2/TixOy catalyst with the highest hydrogen evolution activity was obtained; it needs only 280 mV overpotential to reach 10 mA/cm2 current density in the electrolysis of water.
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Key words:
- hydrogen evolution /
- MoS2/TixOy /
- solvothermal synthesis /
- water splitting
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图 1 钼酸钠+硫代乙酰胺+TixOy在不同溶剂下合成得到的催化剂、TixOy以及2H-MoS2 (JCPDS 37-1492)和Mo15S19(JCPDS 40-0936)XRD谱图
Figure 1 XRD patterns of the MoS2/TixOy catalysts synthesized with sodium molybdate + thioacetamide + TixOy in different solvents, in comparison with TixOy, 2H-MoS2 (JCPDS 37-1492) and Mo15S19 (JCPDS 40-0936)
图 2 钼酸钠+硫代乙酰胺+TixOy在不同溶剂下合成得到的催化剂的SEM照片
Figure 2 SEM image of the MoS2/TixOy catalysts synthesized with sodium molybdate + thioacetamide + TixOy in different solvents
图 3 钼酸钠+硫代乙酰胺+ TixOy在不同溶剂下合成得到的催化剂电化学析氢线性扫描曲线
Figure 3 Polarization curves of electrochemical hydrogen evolution for the MoS2/TixOy catalysts synthesized with sodium molybdate + thioacetamide + TixOy in different solvents
图 4 不同硫源+钼酸钠+ TixOy在水作为溶剂下合成得到的催化剂电化学析氢线性扫描曲线
Figure 4 Polarization curves of electrochemical hydrogen evolution for the MoS2/TixOy catalysts synthesized with water as solvent and using different sulfur sources + sodium molybdate + TixOy
图 5 不同硫源+钼酸钠+ TixOy在水作为溶剂下合成得到的催化剂以及亚氧化钛的XRD谱图
Figure 5 XRD pattern of black titania and the MoS2/TixOy catalysts synthesized with different sulfur sources + sodium molybdate + TixOy in water
图 6 不同钼源+硫代乙酰胺+ TixOy在水作为溶剂下合成得到的催化剂电化学析氢曲线
Figure 6 Polarization curves of electrochemical hydrogen evolution for the MoS2/TixOy catalysts synthesized with different molybdenum sources + thioacetamide + TixOy in water
图 7 不同钼源+硫代乙酰胺+ TixOy在水作为溶剂下合成得到的催化剂XRD谱图
Figure 7 XRD patterns of the MoS2/TixOy catalysts synthesized in water with different molybdenum sources + thioacetamide + TixOy
图 8 MoS2/TixOy和MoS2催化剂的电化学析氢曲线
Figure 8 Electrochemical hydrogen evolution curves of MoS2/TixOy and MoS2 catalysts
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