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<p>Rapid depletion of fossil fuels and the growing global energy demand require the development of sustainable hydrogen production technologies through electrocatalytic water splitting. In this study, we synthesized Co<sub>1.29</sub>Ni<sub>1.71</sub>O<sub>4</sub>@WO<sub>3</sub> composite nanoparticles via a calcination route under an argon atmosphere to enhance the bifunctional hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by water splitting. Comprehensive characterization revealed that the integration of WO<sub>3</sub> with spinel Co<sub>1.29</sub>Ni<sub>1.71</sub>O<sub>4</sub>@WO<sub>3</sub> significantly improved the electrocatalytic performance of the composite material. Electrochemical evaluations demonstrated excellent HER and OER activity, exhibiting a low overpotential of 256 and 303&#xa0;mV with a Tafel gradient of 133 and 86&#xa0;mV&#xa0;dec<sup>−1</sup>, respectively, indicating improved electrocatalytic kinetics. Furthermore, chronoamperometric studies (CA) confirmed outstanding stability over 24&#xa0;h of incessant process, highlighting the robustness of the composite catalyst. This improvement is due to the synergistic effects among the ternary metal components, which enhances the transfer of charges and the accessibility of active sites. This work not only reports a highly efficient and durable HER and OER electrocatalyst but also presents critical insights into the design of multi-metallic composites for renewable energy applications. Results give the significance of these materials in handling the global energy crisis and advancing clean hydrogen production technologies.</p> Graphical abstract <p></p>

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Bifunctional Co1.29Ni1.71O4@WO3 as electrocatalyst for efficient water splitting toward clean energy production

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Amal BaQais,
  • Eman M. Alshehri,
  • Mohammad Shariq,
  • Marium Khan,
  • Aisha H. Al-Moubaraki,
  • Nashwa Mohammed Alahmar,
  • Mustafa S. Elhassan,
  • Walaa S. Alsaidi,
  • A. Khatab

摘要

Rapid depletion of fossil fuels and the growing global energy demand require the development of sustainable hydrogen production technologies through electrocatalytic water splitting. In this study, we synthesized Co1.29Ni1.71O4@WO3 composite nanoparticles via a calcination route under an argon atmosphere to enhance the bifunctional hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by water splitting. Comprehensive characterization revealed that the integration of WO3 with spinel Co1.29Ni1.71O4@WO3 significantly improved the electrocatalytic performance of the composite material. Electrochemical evaluations demonstrated excellent HER and OER activity, exhibiting a low overpotential of 256 and 303 mV with a Tafel gradient of 133 and 86 mV dec−1, respectively, indicating improved electrocatalytic kinetics. Furthermore, chronoamperometric studies (CA) confirmed outstanding stability over 24 h of incessant process, highlighting the robustness of the composite catalyst. This improvement is due to the synergistic effects among the ternary metal components, which enhances the transfer of charges and the accessibility of active sites. This work not only reports a highly efficient and durable HER and OER electrocatalyst but also presents critical insights into the design of multi-metallic composites for renewable energy applications. Results give the significance of these materials in handling the global energy crisis and advancing clean hydrogen production technologies.

Graphical abstract