Reconstruction optimization of distorted FeOOH/Ni hydroxide for enhanced oxygen evolution reaction

Oxygen evolution reaction (OER) is one of the most important anodic reactions in electrochemical conversion devices. Although a lot OER electrocatalysts have been developed, actual active sites during not fully understood. Herein, we report that distorted FeOOH/Ni hydroxide on Ni foam (NF) (d-FeOOH/Ni hydroxide-NF) shows better performance (1.50 V at 100 mA/cm2 and long-term stability for 32 h 425 mA/cm2) than crystalline hydroxide-NF (c-FeOOH/Ni outperforms state-of-the-art electrocatalysts. By using in-situ ex-situ techniques, show interfaces d-FeOOH/Ni hydroxide-NF, which are key OER, well maintained reaction, leading to promoted catalytic high current density. We demonstrate structure rearrangement endows flexibility lattice tolerates volume expansion OER. Our study provides an insightful understanding Fe-Ni-based guidance their design synthesis practical application.