分级结构MoS_2的可控制备及其电催化析氢性能研究

Controllable synthesis of hierarchical structure MoS_2 as efficient electrocatalyst for hydrogen evolution reaction

通过简单的水热反应合成了分级结构MoS_2纳米球,研究了水热反应温度以及聚乙烯吡咯烷酮(PVP)对花状MoS_2形貌的影响。结果表明,PVP对花状纳米球的生成至关重要,只有在PVP存在的情况下才会生成由片层组装的纳米球形结构,这主要归因于MoS_2(002)晶面的表面能高,PVP紧密吸附在MoS_2纳米片表面,从而驱动纳米片组装成花状纳米球。电化学析氢性能测试发现,花状MoS_2纳米球的析氢性能明显优于块体MoS_2,这主要归因于花状MoS_2纳米球能提供更多的催化活性位点。

The hierarchical structure MoS2 nanospheres were synthesized by a simple hydrothermal reaction. The effects of hydrothermal reaction temperature and polyvinylpyrrolidone(PVP) on the morphology of flower-like MoS2 were studied. The results show that polyvinylpyrrolidone is very important for the formation of flower-like nanospheres. The nanosphere structure assembled by the sheet layer will be formed only in the presence of PVP. Due to the high surface energy on the(002) crystal plane of MoS2 nanosheets, the PVP is closely adsorbed on the(002) plane of MoS2 nanosheets to drive the assembly of nanosheets into flower-like nanospheres. The electrochemical hydrogen evolution performance test shows that the HER performance of the flower-like MoS2 nanospheres is significantly better than that of the bulk MoS2, which is mainly attributed to the fact that the flower-like MoS2 nanospheres can provide more catalytic active sites.