Enhanced electrocatalysis for alkaline hydrogen evolution by Mn doping in a Ni 3 S 2 nanosheet array

Developing earth-abundant and efficient catalysts for the hydrogen evolution reaction (HER) is highly desirable. In this communication, we report the development of a Mn-doped Ni3S2 nanosheet array on Ni foam (Mn-Ni3S2/NF) as a superior and durable catalyst for alkaline hydrogen evolution. Such Mn-Ni3S2/NF demands an overpotential of 152 mV to afford 10 mA cm-2 in 1.0 M KOH, 46 mV less than that for Ni3S2/NF. Furthermore, this catalyst also shows high long-term electrochemical durability. This work provides important guidance for exploring optimal HER catalysts.