ArticleSmall (Weinheim an der Bergstrasse, Germany)2026
Bridging Microscopic Interfacial Water and Macroscopic Wettability for Enhanced Hydrogen Evolution Reaction.
Article in Small (Weinheim an der Bergstrasse, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
Electrocatalytic hydrogen evolution reaction (HER) necessitates managing both macroscopic wettability for bubble release and microscopic water structure for proton transfer. However, highly hydrophilic surfaces, while beneficial for bubble transport, tend to induce strongly hydrogen-bonded water networks that hinder proton dynamics, presenting a fundamental conflict in advancing electrocatalyst design. Herein, we leverage polymeric modifiers to tune the surface electronic structure of platinum electrodes and investigate the synergistic influence of macroscopic wettability and microscopic interfacial water structure on HER performance. We demonstrate that peak HER performance is achieved on polyethylenimine (PEI)-modified Pt electrode, which uniquely affords moderate hydrophilicity (contact angle: ∼15°) alongside a disordered, weakly hydrogen-bonded interfacial water network. This dual optimization enhances bubble release and proton-transfer kinetics, reducing the overpotential by 229 mV at 10 mA cm
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