Large-Scale Synthesis of Graphene-Like MoSe₂ Nanosheets for Efficient Hydrogen Evolution Reaction

Two-dimensional (2D) materials have attracted great attention by researchers due to their fascinating properties and promising applications. However, the synthesis methods for few layers are usually difficult to expand to large area applications because of their low yield. In this paper, graphene-like MoSe₂ nanosheets are successfully and scaleable synthesized by a facile and low-cost hydrothermal method under the synergy of PVP and graphene. The ultrathin MoSe₂ nanosheets are typically 1–3 layers, which are confirmed by HRTEM. This unique structure makes this MoSe₂ electrode material show superior activity toward the electrocatalytic hydrogen production with a low Tafel slope about 70 mV·dec^–1. Furthermore, the synthesized graphene-like MoSe₂ nanosheets had a high stability during the electrocatalytic process and we nearly cannot find the degradation after 1000 cyclic voltammetric sweeps.