Description:
The development of high-performance bifunctional electrocatalysts that can catalyze both anodic oxygen evolution (OER) and cathodic hydrogen evolution (HER) is considered to be a promising way to realize hydrogen economy. However, the slow kinetic process for OER and the unsatisfied long-term stability of electrocatalysts restrict their industrial applications which operate on large current density. Herein, NiFe layered double hydroxide (LDH) and FeOOH heterojunction nanosheet array grown on Fe Foam (NiFeOxHy/FF) with superhydrophilic and superhydrophobic surface was designed by a simple one-step hydrothermal method. The structure could optimize the electronic structure, facilitate the exposure of active sites and also improve the charge/mass conductivity. Benefiting from the above advantages, the obtained NiFeOxHy/FF not only exhibits superior OER and HER performance in 1 M KOH with the low overpotential of 203.2 mV and 138.8 mV at 10 mA cm -2 , but also displays remarkable stability at a large current density of 1000 mA cm -2 under simulated industrial conditions (6 M KOH and 85 °C). Furthermore, the overall water splitting device based on NiFeOxHy/FF as anode and cathode was assembled with a commercial solar cell to simulate solar photolysis hydrogen production, which demonstrates the high efficiency of 15.13% for solar hydrogen production. In conclusion, this work provides a useful guide for designing the electrocatalyst for solar-driven electrochemical water splitting at large current densities