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<p>Hydrogen has emerged as a promising clean energy carrier, and the development of cost-effective electrocatalysts that retain high activity under acidic media is crucial for advancing proton exchange membrane water electrolysis (PEMWE). Here, we propose the SiO<sub><i>x</i></sub>/RuCoO<sub><i>x</i></sub> nanoparticles (SiO<sub><i>x</i></sub>/RuCoO<sub><i>x</i></sub> NPs) as bifunctional electrocatalysts for efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under acidic media. The Ru-O-Si interface, along with charge transfer between Ru and Co, modulates the d-band electronic structure of the Ru site, achieving superior performance with a low HER overpotential of 18&#xa0;mV at 10&#xa0;mA·cm<sup>−2</sup> and a turnover frequency of 8.86 H<sub>2</sub>·s<sup>−1</sup> at 100&#xa0;mV. For OER, the overpotential is 217&#xa0;mV at 10&#xa0;mA·cm<sup>−2</sup>. SiO<sub><i>x</i></sub>/RuCoO<sub><i>x</i></sub> NPs exhibit a cell voltage of 1.482&#xa0;V at 10&#xa0;mA·cm<sup>−2</sup> with an energy conversion efficiency of 83.0%. This work takes a significant step toward achieving efficient and cost-effective bifunctional electrocatalysts for water splitting, playing a critical role in the transition to clean energy technologies.</p> Graphical abstract <p></p>

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d-orbital charge density regulation of SiOx/RuCoOx nanoparticles to boost water splitting in acidic media

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • Ting Zhu,
  • Yu-Hao Wang,
  • Teng Sun,
  • Ye-Can Pi,
  • Xiao-Dong Pi,
  • Jun Xu,
  • Kun-Ji Chen

摘要

Hydrogen has emerged as a promising clean energy carrier, and the development of cost-effective electrocatalysts that retain high activity under acidic media is crucial for advancing proton exchange membrane water electrolysis (PEMWE). Here, we propose the SiOx/RuCoOx nanoparticles (SiOx/RuCoOx NPs) as bifunctional electrocatalysts for efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under acidic media. The Ru-O-Si interface, along with charge transfer between Ru and Co, modulates the d-band electronic structure of the Ru site, achieving superior performance with a low HER overpotential of 18 mV at 10 mA·cm−2 and a turnover frequency of 8.86 H2·s−1 at 100 mV. For OER, the overpotential is 217 mV at 10 mA·cm−2. SiOx/RuCoOx NPs exhibit a cell voltage of 1.482 V at 10 mA·cm−2 with an energy conversion efficiency of 83.0%. This work takes a significant step toward achieving efficient and cost-effective bifunctional electrocatalysts for water splitting, playing a critical role in the transition to clean energy technologies.

Graphical abstract