CoS2 nanoparticles grown on Mo2TiC2Tx as an efficient electrocatalyst for hydrogen evolution reaction

At present, the development of cheap and efficient electrocatalytic hydrogen evolution catalyst is of great sig-nificance to the industrialization of hydrogen energy. In this work, Mo2TiC2Tx was firstly obtained by etching Mo2TiAlC2 with hydrofluoric acid (HF), and then CoS2 nanoparticles were grown on the surface of Mo2TiC2Tx to prepare CoS2@Mo2TiC2Tx catalyst by one-pot hydrothermal method. The hydrothermal vulcanization method for the preparation of CoS2@Mo2TiC2Tx electrocatalyst not only saves the experimental cost but also has higher vulcanization efficiency. Due to the synergistic effect of CoS2 and Mo2TiC2Tx, the CoS2@Mo2TiC2Tx catalyst exhibited good hydrogen evolution reaction catalytic activity in 0.5 M H2SO4; at a current density of 10 mA/cm2, the overpotential is only 132 mV, and the Tafel slope is 116 mV/dec. Besides, due to its unique morphology, CoS2@Mo2TiC2Tx still exhibits good durability after 24 h of continuous electrolysis. Therefore, this work pro-vides a possibility to realize non-precious metal electrocatalyst to replace Pt/C.