Pure and stable metallic phase molybdenum disulfide nanosheets for hydrogen evolution reaction

作者：Xiumei Geng, Weiwei Sun, Wei Wu, Benjamin Chen, Alaa A. AL-Hilo, Mourad Benamara, Hongli Zhu, Fumiya Watanabe, Jingbiao Cui, Tar-pin Chen · 发表于：Nature Communications · 年份：2016 · DOI：10.1038/ncomms10672 · 被引用次数：920 · 研究领域：2D Materials and Applications、MXene and MAX Phase Materials、Extracellular vesicles in disease

Metallic-phase MoS2 (M-MoS2) is metastable and does not exist in nature. Pure and stable M-MoS2 has not been previously prepared by chemical synthesis, to the best of our knowledge. Here we report a hydrothermal process for synthesizing stable two-dimensional M-MoS2 nanosheets in water. The metal-metal Raman stretching mode at 146 cm(-1) in the M-MoS2 structure, as predicted by theoretical calculations, is experimentally observed. The stability of the M-MoS2 is associated with the adsorption of a monolayer of water molecules on both sides of the nanosheets, which reduce restacking and prevent aggregation in water. The obtained M-MoS2 exhibits excellent stability in water and superior activity for the hydrogen evolution reaction, with a current density of 10 mA cm(-2) at a low potential of -175 mV and a Tafel slope of 41 mV per decade.