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<p>This study reports a novel green synthesis of carbon-supported β-Ni(OH)<sub>2</sub>-Ag/AgCl electrocatalysts, using for the first time a <i>Sargassum spp.</i> extract as a stabilizing agent in a hydrothermal method. Physicochemical characterization by FT-IR (Fourier-transform infrared spectroscopy), XRD (X-ray diffraction), SEM (scanning electron microscopy), and Raman confirmed the formation of a heterostructure composed of nanosheets decorated with Ag/AgCl nanoparticles and capped by organic remains. The optimized catalyst exhibited exceptional Oxygen Reduction Reaction (ORR) activity in alkaline media, achieving a half-wave potential of 0.880&#xa0;V (<i>vs.</i> RHE), surpassing the commercial Pt/C benchmark by 78&#xa0;mV. Kinetic analysis via the Koutecky–Levich equation confirmed a preferred four-electron pathway. Furthermore, the composite demonstrated superior operational durability compared to the platinum standard. This synergistic performance positions this bio-derived material as a robust, low-cost alternative for energy conversion technologies.</p> Graphical abstract <p></p>

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Green synthesis and characterization of bimetallic Ni(OH)2-Ag/AgCl electrocatalysts for the oxygen reduction reaction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月1日

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  • Edgar Serafín-Mancera,
  • José Luis López-Miranda,
  • Maricarmen Gómez Paredes,
  • Fabian Mares-Briones,
  • Rodrigo Esparza,
  • Isaac Velázquez-Hernández,
  • Miriam Estévez

摘要

This study reports a novel green synthesis of carbon-supported β-Ni(OH)2-Ag/AgCl electrocatalysts, using for the first time a Sargassum spp. extract as a stabilizing agent in a hydrothermal method. Physicochemical characterization by FT-IR (Fourier-transform infrared spectroscopy), XRD (X-ray diffraction), SEM (scanning electron microscopy), and Raman confirmed the formation of a heterostructure composed of nanosheets decorated with Ag/AgCl nanoparticles and capped by organic remains. The optimized catalyst exhibited exceptional Oxygen Reduction Reaction (ORR) activity in alkaline media, achieving a half-wave potential of 0.880 V (vs. RHE), surpassing the commercial Pt/C benchmark by 78 mV. Kinetic analysis via the Koutecky–Levich equation confirmed a preferred four-electron pathway. Furthermore, the composite demonstrated superior operational durability compared to the platinum standard. This synergistic performance positions this bio-derived material as a robust, low-cost alternative for energy conversion technologies.

Graphical abstract