Low-overpotential overall water splitting by a cooperative interface of cobalt-iron hydroxide and iron oxyhydroxide

Interface engineering is a powerful strategy for modulating electronic structure and enhancing intrinsic activity of electrocatalysts water splitting. Here, we grow two-dimensional cobalt-iron hydroxide (CoFe-OH) nanosheets on nickel foam substrates deposit FeOOH nanoparticles in rapid scalable wet chemical approach. The [email protected] nanocomposite features abundant active sites high surface area, allowing fast kinetics electrochemical electrode has low overpotential value 200 mV at 50 mA cm?2 oxygen evolution. When used as both anode cathode overall splitting, provides cell voltage 1.56 V to deliver 10 current density. synergistic presumed be from the seamless interface CoFe-OH FeOOH, improving conductivity mass transfer. We envision that this simple approach may offer new direction designing efficient electrodes energy conversion applications.