Surface sulfidation toward highly active S/NiMoSe for superior alkaline hydrogen evolution

Abstract

A S/NiMoSe hierarchical microsphere-supported nanofiber electrocatalyst was synthesized via a surface sulfidation strategy. It exhibits excellent alkaline HER performance: -69 mV overpotential at -10 mA cm-2 and 41 h durability at -100 mA cm-2. Surface sulfidation weakens interfacial water hydrogen-bonding and gene-rates SO42- via reconstruction, thus sustaining high electrocatalyst activity and stability.