Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, PR China.
Department of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
J Colloid Interface Sci. 2019 Apr 15;542:355-362. doi: 10.1016/j.jcis.2019.02.018. Epub 2019 Feb 7.
Recently, molybdenum disulfide (MoS) as a new type of catalyst, has been used for hydrogen evolution. In order to overcome the shortcomings of MoS, such as poor conductivity and lack of catalytic activity sites, various materials were added to prepare composites, such as graphene with good conductivity.
In this work, we combined MoS with graphene through a very simple liquid-phase salt-assisted co-exfoliation method. The obtained MoS/graphene nano-composites have been further applied to electrocatalyst of hydrogen evolution reaction. The influences of different ratio of MoS to graphene and different solvents of exfoliation on the electrocatalytic activity for the hydrogen evolution reaction have been investigated in detail.
In general, the obtained MoS/graphene nano-catalysts exhibits the smallest Tafel slope of 61 mV/dec with the exfoliation solvent of isopropanol, and 65 mV/dec in N-methyl pyrrolidone. All the MoS/graphene composites exhibit much better catalytic activity than either MoS or graphene single substance due to the synergetic effect between MoS and graphene nanosheets.
最近，二硫化钼（MoS）作为一种新型催化剂，已被用于析氢反应。为了克服 MoS 导电性差和催化活性位点不足等缺点，人们添加了各种材料来制备复合材料，如导电性良好的石墨烯。
在这项工作中，我们通过非常简单的液相盐辅助共剥离法将 MoS 与石墨烯结合在一起。所得的 MoS/石墨烯纳米复合材料进一步应用于析氢反应的电催化剂。详细研究了不同比例的 MoS 与石墨烯和不同剥离溶剂对析氢反应电催化活性的影响。
总的来说，在异丙醇作为剥离溶剂时，所得到的 MoS/石墨烯纳米催化剂具有最小的 61 mV/dec 的 Tafel 斜率，在 N-甲基吡咯烷酮中为 65 mV/dec。由于 MoS 和石墨烯纳米片之间的协同作用，所有的 MoS/石墨烯复合材料都表现出比 MoS 或石墨烯单一组分更好的催化活性。
