College of Material Science and Engineering, Shaanxi University of Science and Technology, 710021, China.
Sci Rep. 2017 Apr 13;7:45608. doi: 10.1038/srep45608.
The transition metal dichagenides and their metallic 1T structure are attracting contemporary attentions for applications in high-performance devices because their peculiar optical and electrical properties. The single and few layers 1T structure is generally obtained by mechanical or chemical exfoliation. This work presents facile one-step synthesis of 2H-1T MoS:Cu/reduced graphene oxide nanosheets. The experiment results indicated that the MoS and MoS:Cu prepared by simple chemical solution reaction possessed 2H-1T structures. The reduced graphene oxide (rGO) incorporation further induced the phase transition from 2H-MoS to 1T-MoS and morphology transition from granular/nanosheet to more nanosheet. The 2H-1T structure and 2H → 1T phase transition, together with the Cu doping and interface effect between the MoS and rGO, remarkably enhanced the conduction and photoconduction of the nanostructures. Thus, Cu doping and rGO incorporation obviously enhanced the catalytic activity and its stability, making the MoS:Cu/rGO nanosheet a most active and stable catalyst for hydrogen evolution. This work clearly indicates that the 1T-MoS nanosheets with high catalytic activity for hydrogen evolution can be easily obtained by the facile low temperature chemical method and induction of rGO.
过渡金属二卤化物及其金属 1T 结构因其独特的光学和电学性质而引起了当代人们对高性能器件应用的关注。单层和少数层 1T 结构通常通过机械或化学剥落获得。本工作提出了一种简便的一步合成 2H-1T MoS:Cu/还原氧化石墨烯纳米片的方法。实验结果表明，通过简单的化学溶液反应制备的 MoS 和 MoS:Cu 具有 2H-1T 结构。还原氧化石墨烯（rGO）的掺入进一步诱导了从 2H-MoS 到 1T-MoS 的相转变以及从颗粒/纳米片到更多纳米片的形貌转变。2H-1T 结构和 2H→1T 相转变，以及 Cu 掺杂和 MoS 与 rGO 之间的界面效应，显著增强了纳米结构的传导和光电导。因此，Cu 掺杂和 rGO 的掺入明显提高了催化剂的催化活性和稳定性，使 MoS:Cu/rGO 纳米片成为用于析氢的最有效和最稳定的催化剂。本工作清楚地表明，具有高析氢催化活性的 1T-MoS 纳米片可以通过简便的低温化学方法和 rGO 的诱导很容易地获得。
