Potentiostatic electrodeposition of cost-effective and efficient Ni–Fe electrocatalysts on Ni foam for the alkaline hydrogen evolution reaction

The hydrogen evolution reaction (HER) using earth-abundant noble-metal-free catalysts has gained substantial interest in electrocatalytic water splitting technologies, particularly in water-alkali electrolyzers. The development of highly-efficiency and durable inexpensive electrocatalysts to accelerate the kinetics of HER is still a formidable challenge. In this study, nickel–iron (Ni–Fe) electrocatalyst directly grown on backbones of Ni foam (NF) substrate was facile prepared via one-step potentiostatic electrodeposition method. The obtained Ni–Fe electrocatalyst exhibits a film-like structure. Owing to high electrical conductivity and composition optimization, the synthesized Ni–Fe electrocatalyst with Ni/Fe atomic ratio of c.a. 65:35 possesses an attractive electrocatalytic activity with low overpotentials of 142, 205, and 239 mV at 10, 50, and 100 mA·cm^?2 in alkaline electrolyte, respectively.