Biomimetic Fe 7 S 8 /Carbon electrocatalyst from [FeFe]‐Hydrogenase for improving pH‐Universal electrocatalytic hydrogen production

Abstract Efficient and cost‐effective electrocatalysts that can operate across a wide range of pH conditions are essential for green hydrogen production. Inspired by biological systems, Fe 7 S 8 nanoparticles incorporated on polydopamine matrix electrocatalyst were synthesized by co‐precipitation and annealing process. The resulting Fe 7 S 8 /C electrocatalyst possesses a three‐dimensional structure and exhibits enhanced electrocatalytic performance for hydrogen production across various pH conditions. Notably, the Fe 7 S 8 /C electrocatalyst demonstrates exceptional activity, achieving low overpotentials of 90.6, 45.9, and 107.4 mV in acidic, neutral, and alkaline environments, respectively. Electrochemical impedance spectroscopy reveals that Fe 7 S 8 /C exhibits the lowest charge transfer resistance under neutral conditions, indicating an improved proton‐coupled electron transfer proce…