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Structurally ordered PtSn intermetallic nanoparticles supported on ATO for efficient methanol oxidation reaction.

Wei Chen1, Zhao Lei1, Tang Zeng1

  • 1College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China. niancaicheng@fzu.edu.cn and Key Laboratory of Eco-materials Advanced Technology, Fuzhou University, Fuzhou, 350108, China.

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Summary

Structurally ordered platinum-tin (PtSn) intermetallic nanoparticles on antimony-doped tin oxide (ATO) offer superior methanol oxidation reaction (MOR) activity and durability for direct methanol fuel cells compared to commercial catalysts.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Direct methanol fuel cells (DMFCs) require cost-effective catalysts with high activity and stability for the methanol oxidation reaction (MOR).
  • Current commercial platinum on carbon (Pt/C) catalysts face challenges in terms of cost, activity, and durability.
  • Developing novel nanostructured catalysts is crucial for advancing fuel cell technology.

Purpose of the Study:

  • To synthesize structurally ordered platinum-tin (PtSn) intermetallic nanoparticles supported on antimony-doped tin oxide (ATO).
  • To evaluate the methanol oxidation reaction (MOR) activity, durability, and CO tolerance of the synthesized PtSn/ATO catalysts.
  • To demonstrate a strategy for designing high-performance Pt-based intermetallic nanoparticle catalysts for fuel cells.

Main Methods:

  • Synthesis of PtSn intermetallic nanoparticles on ATO support via a hydrothermal method in ethylene glycol at 200 °C.
  • Characterization of the nanoparticle structure and composition.
  • Electrochemical evaluation of MOR activity, durability through accelerated cycling tests, and CO tolerance compared to commercial Pt/C.

Main Results:

  • Structurally ordered PtSn intermetallic nanoparticles were successfully synthesized on the ATO support.
  • The PtSn/ATO catalysts exhibited significantly enhanced MOR activity, 4.1 times higher than commercial Pt/C.
  • The PtSn/ATO catalyst demonstrated superior durability, retaining approximately 85% of its initial current density after 500 cycles, compared to ~50% for Pt/C.
  • The synthesized catalysts also showed improved CO tolerance.

Conclusions:

  • Rational design of structurally ordered PtSn intermetallic nanoparticles on ATO provides a promising pathway for high-performance DMFC catalysts.
  • These novel catalysts offer significant improvements in activity, durability, and CO tolerance over commercial Pt/C.
  • The developed synthesis strategy is applicable for designing advanced Pt-based intermetallic nanoparticle catalysts for various applications.