Mo‐Assisted Boronized Iron Foam Self‐Supported Electrode for Bifunctional HER/OER in Alkaline Water Electrolysis

ABSTRACT Achieving industrial‐scale, low‐cost, self‐supported electrodes for alkaline water electrolysis is a central challenge. The self‐supported electrodes often suffer from limited intrinsic activity and weak interfacial coupling, especially in iron foam based electrodes. Here, we propose a Mo‐assisted boronized foam‐iron self‐supported electrode fabrication strategy. Boronization creates metal‐boron networks on the Fe foam surface, strengthening the coupling between active centers and the substrate with the introduction of Mo. The as‐formed TMo 2 FeB 2 /FeB@IF catalyst exhibits high bifunctional activity for both HER (256 mV at 100 mA cm −2 ) and OER (370 mV at 100 mA cm −2 ).The two‐electrode alkaline water electrolysis constructed of Mo 2 FeB 2 /FeB@IF can reach an operating voltage of 1.90 V at 100 mA cm −2 , significantly outperforming commercial Pt/C@IF and RuO 2 @IF. This self‐supported electrode provides a scalable, cost‐effective pathway toward industrial‐grade alkaline water electrolysis integrated with renewable energy sources.