Heterointerface engineered NiFe(OH)x/Ni3S2 electrocatalysts to overcome the scaling relationship for ultrahigh-current-density water oxidation

Breaking the scaling relationship of water oxidation is gateway to obtain an ultrahigh current density at a low potential for greatly improving electrolysis efficiency in industrial hydrogen production. Herein, we demonstrate novel heterointerface engineered NiFe(OH)x/Ni3S2 electrocatalyst successfully circumvent oxygen evolution reaction (OER), which significantly decreases difference Gibbs free energy HOO* and HO*(}ΔGhoo*–ΔGho*) from 3.20 2.38 eV. To achieve 2000 mA cm−2, requires small overpotential 310 mV with ultralow Tafel slope 20.8 dec−1. It can also steadily operate under 1000 cm−2 over 100 h insignificant activity loss, thus surpassing state-of-the-art OER catalysts date. A parallel catalytic mechanism has been disclosed be responsible optimization pathway, realizing homogenization multi-intermediate adsorption extremely elevated performance densities. These findings could guidance developing industrial-grade high-performance electrocatalysts splitting.