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<p>In this study, a gold-based electrocatalyst was developed for ethanol electrooxidation in alkaline medium as an alternative to oxygen evolution in water electrolysis to reduce the energy input required for hydrogen production. The catalyst consists of Au nanoparticles of ~ 200 nm supported on a three-dimensional gas diffusion electrode (Au@GDE) prepared by galvanostatic pulse electrodeposition. Optimization revealed that a 1 s pulse duration and an Au loading of 150 µg/cm<sup>2</sup> provided the best catalytic performance. In 1 M NaOH + 1 M ethanol, the optimized Au@GDE delivered a peak mass activity of 42.2 mA/mg<sub>Au</sub> with an onset potential of − 0.25 V vs. SCE. A current density of 10 mA/cm<sup>2</sup> was achieved at an anodic potential approximately 800 mV lower than that required for oxygen evolution under identical conditions. The catalyst exhibited strong tolerance to poisoning (<i>I</i><sub>f</sub>/<i>I</i><sub>b</sub> = 3.5) and showed only 4% activity loss after 200 consecutive cycles, demonstrating efficient and durable ethanol-assisted hydrogen production.</p> Graphical Abstract <p></p>

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Towards hydrogen production from ethanol electrooxidation using flow-through gold electrocatalyst supported on gas diffusion electrode

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Charif Dehchar,
  • Imene Chikouche,
  • Sophie Tingry,
  • Ahmed Zouaoui

摘要

In this study, a gold-based electrocatalyst was developed for ethanol electrooxidation in alkaline medium as an alternative to oxygen evolution in water electrolysis to reduce the energy input required for hydrogen production. The catalyst consists of Au nanoparticles of ~ 200 nm supported on a three-dimensional gas diffusion electrode (Au@GDE) prepared by galvanostatic pulse electrodeposition. Optimization revealed that a 1 s pulse duration and an Au loading of 150 µg/cm2 provided the best catalytic performance. In 1 M NaOH + 1 M ethanol, the optimized Au@GDE delivered a peak mass activity of 42.2 mA/mgAu with an onset potential of − 0.25 V vs. SCE. A current density of 10 mA/cm2 was achieved at an anodic potential approximately 800 mV lower than that required for oxygen evolution under identical conditions. The catalyst exhibited strong tolerance to poisoning (If/Ib = 3.5) and showed only 4% activity loss after 200 consecutive cycles, demonstrating efficient and durable ethanol-assisted hydrogen production.

Graphical Abstract