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<p>Hydrogen evolution reaction (HER) is crucial for clean energy production; however, it often suffers from high overpotentials during water electrolysis, significantly increasing the cost of hydrogen production. To address this, cost-effective Fe-doped CoS nanoparticles (NPs) were synthesized via a hydrothermal method, achieving enhanced electrocatalytic activity for HER. Fe doping improved HER performance by optimizing conductivity and leveraging the synergistic effects of Fe and Co metal ions. Comprehensive characterization techniques confirmed enhanced catalytic properties, which were demonstrated in 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub>. Among the prepared catalysts, Fe<sub>0.3</sub>Co<sub>0.7</sub>S NPs show higher catalytic performance with a smaller overpotential of 185&#xa0;mV and a Tafel slope of 64&#xa0;mV/dec. Also, it exhibits excellent stability in 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub> at 10&#xa0;mA/cm<sup>2</sup>. The exceptional activity of Fe<sub>0.3</sub>Co<sub>0.7</sub>S nanoparticles may result from optimal Fe doping, enhancing CoS active sites, while excessive doping hinders HER activity by spoiling active edge sites.</p>

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Boosting hydrogen evolution efficiency in acidic media with Fe-doped CoS electrocatalysts

  • 期刊论文

  • 发表日期：

    2025年6月14日

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  • Zahrah Alhalili,
  • Mohammad Shariq,
  • Wafa Al-Gethami,
  • Zarah I. Alzahrani,
  • Fahad Saleh Almubaddel,
  • Noha Al-Qasmi

摘要

Hydrogen evolution reaction (HER) is crucial for clean energy production; however, it often suffers from high overpotentials during water electrolysis, significantly increasing the cost of hydrogen production. To address this, cost-effective Fe-doped CoS nanoparticles (NPs) were synthesized via a hydrothermal method, achieving enhanced electrocatalytic activity for HER. Fe doping improved HER performance by optimizing conductivity and leveraging the synergistic effects of Fe and Co metal ions. Comprehensive characterization techniques confirmed enhanced catalytic properties, which were demonstrated in 0.5 M H2SO4. Among the prepared catalysts, Fe0.3Co0.7S NPs show higher catalytic performance with a smaller overpotential of 185 mV and a Tafel slope of 64 mV/dec. Also, it exhibits excellent stability in 0.5 M H2SO4 at 10 mA/cm2. The exceptional activity of Fe0.3Co0.7S nanoparticles may result from optimal Fe doping, enhancing CoS active sites, while excessive doping hinders HER activity by spoiling active edge sites.