Enhanced Catalytic Activities of Metal-Phase-Assisted 1T@2H-MoSe 2 Nanosheets for Hydrogen Evolution

Abstract How to balance the active sites and conductivity for electrocatalysts in hydrogen evolution reaction (HER) is still a challenge. In this paper, we reported the enhanced catalytic activeties of metal-phase assisted 1T@2H-MoSe2 nanosheets for hydrogen evolution. Combining with the structure analysis and electrochemical measurement results, we concluded that the incorporation of 1T metal phase into its 2H matrix could increase the electro conductivity of the catalysts and yield more active sites due to the atom-rearrangement in the phase transformation progress. An HER electrode with low onset potential of 20 mV and small Tafel slope of 41 mV/dec were obtained for 1T@2H-MoSe2 nanosheets with the optimized active sites and conductivity. This work can broaden our horizons in the design of new highly efficient catalysts for hydrogen evolution.