Phase evolution and electrocatalytic performance for the hydrogen evolution reaction of MoxRe1-xS2 nanosheets

摘要

? 2022 Hydrogen Energy Publications LLCTransition metal doping is an effective method to induce a structural phase transition and improve the electrocatalytic performance of transition metal chalcogenides (TMDs). In this study, MoxRe1-xS2 nanosheets with Mo fraction x from 0 to 1 were grown on a carbon nanotube/carbon cloth (CNT@CC) substrate using a hydrothermal method by changing the molar ratio of Na2MoO4·2H2O to NH4ReO4 in the precursor solution. The effect of the Mo fraction x on the phase structure and electrocatalytic performance for the hydrogen evolution reaction (HER) of MoxRe1-xS2 nanosheets was studied. The results indicated that MoxRe1-xS2 consists of the 1T′ phase (Re, Mo)S2 and the 2H phase (Mo, Re)S2, and the proportion of the 1T′ phase is in the range of 40–50. Mo0.5Re0.5S2/CNT@CC shows the best HER catalytic activity with an overpotential of 85 mV at a current density of 10 mAcm?2, a Tafel slope of 38 mV dec?1 and a charge transfer resistance of 1.04 Ω. This excellent HER catalytic activity is attributed to the phase transition, defects and S vacancies on the basal planes, as well as the synergistic effect between the MoxRe1-xS2 nanosheets and CNT.