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Geometrically Ordered Triangular-Atom-Unit Zn-PtCo Intermetallic for Highly Efficient and Durable Fuel Cells.

Liangbin Liu1,2, Yang Yang3, Changhong Zhan2

  • 1Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361005, China.

Nano Letters
|October 30, 2025
PubMed
Summary
This summary is machine-generated.

A novel Zn-decorated PtCo intermetallic catalyst (Zn-PtCo IMC) significantly boosts proton exchange membrane fuel cell performance and durability. This breakthrough addresses cobalt dissolution, enhancing catalyst stability for cleaner energy applications.

Keywords:
PtCo intermetallicfuel cellgeometrically orderedlong-term stabilityoxygen reduction reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Proton exchange membrane fuel cells (PEMFCs) require highly efficient and stable oxygen reduction reaction (ORR) catalysts.
  • Platinum-cobalt (PtCo) intermetallics show promise but suffer from cobalt dissolution, limiting their application.

Purpose of the Study:

  • To develop a stable and highly active Pt-type ORR catalyst for PEMFCs.
  • To mitigate cobalt dissolution in PtCo intermetallic catalysts.

Main Methods:

  • Synthesis of a partially geometrically ordered Zn-decorated PtCo intermetallic (Zn-PtCo IMC) by incorporating Zn into the PtCo lattice.
  • Fabrication and testing of Zn-PtCo IMC-based fuel cells.
  • Accelerated durability testing (120k cycles).
  • In-depth mechanistic studies.

Main Results:

  • The Zn-PtCo IMC exhibits a stable triangular-atom-unit structure, enhancing durability.
  • Zn-PtCo IMC-based fuel cells achieved a power density of 1.98 W cm⁻², surpassing commercial Pt/C and disordered Zn-PtCo.
  • The catalyst retained 61.2% of its mass activity after 120k cycles.

Conclusions:

  • The geometrically ordered structure in Zn-PtCo IMC effectively weakens oxygen adsorption and increases cobalt diffusion energy barriers.
  • This leads to significantly enhanced activity and durability compared to conventional catalysts.
  • Zn-PtCo IMC represents a promising catalyst for advanced PEMFC applications.