Enhancing anti-chlorine corrosion of NiS by Mo-doping for mimic seawater electrolysis.

Designing highly active electrocatalysts that can resist chloride ion (Cl) corrosion during seawater electrolysis is still a challenge. Here, Mo-doping is introduced to synchronously improve the electrocatalytic activity and anti-chlorine corrosion of NiS toward the efficient overall seawater splitting. With commercial nickel-molybdenum foam (NMF) as the reactive substrates, Mo-doped NiS columnar arrays (Mo-NiS/NMF) are fabricated via a one-step hydrothermal process, which expose abundant active sites with the ameliorated surface electronic configurations toward the enhanced binding with OH ( denotes an active site) but the weakened one with *Cl. As expected, they afford the excellent bi-functionality for both oxygen and hydrogen evolution reactions (OER and HER), with the remarkably improved anti-corrosion to Cl at anode as compared to pristine NiS. In alkaline mimic seawater (1.0 M NaOH + 0.5 M NaCl), Mo-NiS/NMF requires 330 mV (for OER) and 209 mV (for HER) overpotentials at the current density of ±100 mA cm, and a low cell voltage of 1.52 V at 10 mA cm for overall seawater splitting. This work highlights a feasible strategy to explore highly active and stable electrocatalysts for sustainable H production.