Cation etching-induced deep self-reconstruction to form a polycrystalline structure for efficient electrochemical water oxidation.

In this work, we report a straightforward in situ leaching strategy to achieve rapid structure self-reconstruction of NiRu-OH/NF. The as-prepared electrode shows excellent OER performance with a low overpotential of 321 mV at 100 mA cm ^-2 . It can deliver 10 mA cm ^-2 at 1.53 V in a water-alkali electrolyzer as the anode and operates steadily at 100 mA cm ^-2 with a small cell voltage for 50 h.