Facilitating Active Species Generation by Amorphous NiFe‐Bi Layer Formation on NiFe‐LDH Nanoarray for Efficient Electrocatalytic Oxygen Evolution at Alkaline pH

Abstract Searching for a simple and fast strategy to effectively enhance the oxygen evolution reaction (OER) performance of non‐noble‐metal electrocatalysts in alkaline media remains a significant challenge. Herein, the OER activity of NiFe‐LDH nanoarray on carbon cloth (NiFe‐LDH/CC) in alkaline media is shown to be greatly boosted by an amorphous NiFe‐Borate (NiFe‐B i ) layer formation on NiFe‐layered double hydroxide (NiFe‐LDH) surface. Such a NiFe‐LDH@NiFe‐B i /CC catalyst electrode only needs an overpotential of 294 mV to drive 50 mA cm −2 in 1.0 m KOH; 116 mV less than that needed by NiFe‐LDH/CC. Notably, this electrode also demonstrates strong long‐term electrochemical durability. The superior activity is ascribed to the pre‐formed amorphous NiFe‐B i layer effectively promoting active species generation on the NiFe‐LDH surface. This work opens up exciting new avenues for developing high‐performance water‐oxidation catalyst materials for application.