Experimental and Theoretical Insights of MoS 2 /Mo 3 N 2 Nanoribbon‐Electrocatalysts for Efficient Hydrogen Evolution Reaction

MoS 2 is a promising material for electrocatalysis and opens up avenues for the development of non‐precious metal electrocatalysts for hydrogen evolution reaction in acidic media. However, the activity of MoS 2 has been severely impeded because of its inferior conductivity. Herein, a nanoribbon‐like MoS 2 /Mo 3 N 2 hybrid is successfully fabricated via partial sulfidation of Mo 3 N 2 in H 2 S atmosphere. The synergistic effect between the high intrinsic activity of MoS 2 and the desirable conductivity of Mo 3 N 2 contributes to the overpotential at the current density of 10 mA cm −2 (η 10 ) of 196 mV towards hydrogen evolution, distinctively lower than Mo 3 N 2 (467 mV) and MoS 2 (293 mV). The theoretical simulation discloses that the Gibbs free‐energy for the adsorption of atomic hydrogen (|ΔG H* |) for MoS 2 /Mo 3 N 2 is less than that of others, and thus facilitating the hydrogen evolution.