Sulphur doping of nickel ferrite nanosheet array for enhanced water oxidation

Industrial water electrolysis requires highly-active and ampere-current-bearing oxygen evolution reaction (OER) catalysts, but achieving such a large operating current density at low overpotentials in available OER catalysts still remains grand challenge. Herein, we report facile conventional strategy to grow vertically non-metallic modified nickel ferrite nanosheets on Fe foam (S-NiFe2O4/IF) as largecurrent-density catalysts. The aligned nanosheet arrays can offer electrochemical surface area, the spacing between nanoarrays allow for effective electrolyte access active sites. introduction of S enhanced adsorption dissociation optimized intermediates. As result, S-NiFe2O4/IF exhibits superior activity with an overpotential 287 326 mV achieve 100 500 mA cm−2, respectively, displays robust stability alkaline media. In addition, synthesis developed here be applied other mixed transition metal oxides similar selfsupported earth-abundant advanced electrocatalysis energy-related reactions.