Self-standing Mo-NiO/Ni electrocatalyst with nanoporous structure for hydrogen evolution reaction

Mo-Ni based materials are the favored catalysts for hydrogen evolution reaction (HER). In this work, we report the synthesis of nanoporous Mo-NiO/Ni electrocatalyst with self-standing structure through a simple dealloying method. The effect of Mo content on the morphology and electrochemical performance of the catalyst is investigated. The np-Mo6 sample delivers a low overpotential of 34 mV at 10 mA cm−2, a Tafel slope of 49 mV dec−1, and 100 h long-term stability of HER. The high specific surface area and suitable hydrogen adsorption/desorption energy contribute to the superior electrocatalytic activity and rapid kinetics. The self-standing structure prevents the loss of active components, which favors of the stability of the electrode.