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<p>Although commercial Pt/C catalyst is currently the preferred catalyst for hydrogen evolution reaction (HER) at the cathode of a water electrolyzer, large-scale applications in the prospective industries are still constrained severely by its high cost and insufficient durability. Therefore, developing a highly active, pH-universal, low-cost, and robust HER electrocatalyst is a key aspect for promoting the application of green hydrogen energy, but challenging. In this work, highly defective graphene nanospheres were prepared by arc discharge in toluene, and then annealed to form carbon nano onions (CNOs). Three catalysts with excellent pH-universal activities and stabilities, CoPt<sub>3</sub>@CNOs, CoPt@CNOs, Co<sub>3</sub>Pt@CNOs, were then prepared by loading Co-Pt alloys with various phases on CNOs using microwave hydrothermal method. Structural characterizations revealed that the uniformly distributed CoPt alloy nanoparticles with an average size of 2.78&#xa0;nm, the proper bonding between Co and Pt, and the strong confinement effect of CNOs substrate for CoPt nanoparticles brought CoPt@CNOs with optimized HER performance, which is even better than that of commercial Pt/C catalysts. CoPt@CNOs required low overpotentials of 33, 36 and 26 mV at a current density of 10&#xa0;mA cm<sup>− 2</sup>, and 132, 128 and 43 mV at 100&#xa0;mA cm<sup>− 2</sup> in 1&#xa0;M KOH, 1&#xa0;M PBS, and 0.5 M H<sub>2</sub>SO<sub>4</sub>, respectively. In addition, the CoPt@CNOs showed excellent stability over the full pH range. More importantly, the Pt content in CoPt@CNOs was only 9.75 wt%, which reduced more than one half compared with 20 wt% in commercial Pt/C catalysts. This study presents an easy and economical approach to fabricate high-efficiency and pH-universal HER catalysts, which provides a great promise for the commercial use of green hydrogen.</p> Graphical Abstract <p></p>

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Preparation and Hydrogen Evolution Property Tunning of Carbon Nano Onion Supported Co-Pt Alloy Catalysts

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Huiyu Li,
  • Bin Zhang,
  • Yiqing Jiang,
  • Yanhui Song,
  • Xinliang Feng,
  • Peizhi Liu,
  • Junjie Guo

摘要

Although commercial Pt/C catalyst is currently the preferred catalyst for hydrogen evolution reaction (HER) at the cathode of a water electrolyzer, large-scale applications in the prospective industries are still constrained severely by its high cost and insufficient durability. Therefore, developing a highly active, pH-universal, low-cost, and robust HER electrocatalyst is a key aspect for promoting the application of green hydrogen energy, but challenging. In this work, highly defective graphene nanospheres were prepared by arc discharge in toluene, and then annealed to form carbon nano onions (CNOs). Three catalysts with excellent pH-universal activities and stabilities, CoPt3@CNOs, CoPt@CNOs, Co3Pt@CNOs, were then prepared by loading Co-Pt alloys with various phases on CNOs using microwave hydrothermal method. Structural characterizations revealed that the uniformly distributed CoPt alloy nanoparticles with an average size of 2.78 nm, the proper bonding between Co and Pt, and the strong confinement effect of CNOs substrate for CoPt nanoparticles brought CoPt@CNOs with optimized HER performance, which is even better than that of commercial Pt/C catalysts. CoPt@CNOs required low overpotentials of 33, 36 and 26 mV at a current density of 10 mA cm− 2, and 132, 128 and 43 mV at 100 mA cm− 2 in 1 M KOH, 1 M PBS, and 0.5 M H2SO4, respectively. In addition, the CoPt@CNOs showed excellent stability over the full pH range. More importantly, the Pt content in CoPt@CNOs was only 9.75 wt%, which reduced more than one half compared with 20 wt% in commercial Pt/C catalysts. This study presents an easy and economical approach to fabricate high-efficiency and pH-universal HER catalysts, which provides a great promise for the commercial use of green hydrogen.

Graphical Abstract