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We developed a new method for creating stable platinum atomic clusters (Pt-ACs) on defective graphene. This approach enhances electrocatalytic activity for hydrogen evolution reactions, reducing platinum usage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Platinum atomic clusters (Pt-ACs) offer superior electrocatalytic performance due to their high surface area and unique electronic properties.
  • Challenges exist in synthesizing and stabilizing Pt-ACs due to their small size and tendency to agglomerate.

Purpose of the Study:

  • To develop a novel method for producing ultrasmall, well-defined, and stable Pt-ACs.
  • To investigate the role of carbon defects in the synthesis and stabilization of Pt-ACs.
  • To evaluate the electrocatalytic performance of the synthesized Pt-ACs for the hydrogen evolution reaction (HER).

Main Methods:

  • A one-step carbon-defect-driven electroless deposition method was employed.
  • Theoretical simulations were used to understand the preferential reduction of Pt ions at defect sites.
  • Electrochemical analyses were performed to assess catalytic activity and stability.
  • Proton exchange membrane water electrolysis was conducted using the synthesized catalysts.

Main Results:

  • Ultrasmall, well-defined, and stable Pt-ACs supported by defective graphene (Pt-AC/DG) were successfully synthesized.
  • Theoretical simulations confirmed that carbon defects, with lower work functions, drive preferential Pt ion reduction and stabilization.
  • Pt-AC/DG demonstrated enhanced mass activity, high Pt utilization efficiency, and excellent stability for HER compared to commercial Pt/C.
  • Proton exchange membrane water electrolysis using Pt-AC/DG as a cathode showed excellent hydrogen generation activity and stability over 200 hours with reduced Pt loading.

Conclusions:

  • The carbon-defect-driven electroless deposition method is effective for synthesizing stable and highly active Pt-ACs.
  • Defective graphene serves as an excellent support for immobilizing Pt-ACs, preventing agglomeration.
  • Pt-AC/DG catalysts show significant promise for efficient and cost-effective hydrogen production via water electrolysis.