Platinum‐Based Bimetallic Electrocatalyst for Hydrogen Evolution and Oxidation Reactions in Alkaline Media

Achieving sustainable green hydrogen economy requires overcoming the challenges associated with hydrogen production and utilization, one of them being the sluggish kinetics of hydrogen evolution and oxidation reactions (HER/HOR) in alkaline media. Utilizing Pt‐based bimetallic catalysts enhances the HER/HOR reaction rate by exploiting the different properties of each metal. However, the lack of detailed understanding of the mechanism driving alkaline HER/HOR limits further advancement. This work establishes the co‐adsorption of hydrogen and hydroxide as a dual activity descriptor for alkaline HER/HOR. By integrating electrochemical analyses (CV, LSV, EIS) with density functional theory trends across a series of Pt‐based bimetallic alloys, we show that balancing H and OH affinities is critical for optimal activity. Rather than relying on a single descriptor, this study proposes a dual‐descriptor framework for rational catalyst selection, highlighting PtRu and PtIr as examples for optimal binding balance.