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Engineering PtCu nanoparticles for a highly efficient methanol electro-oxidation reaction.

Pengfei Yao1,2, Jing Cao1,2, Mingbo Ruan1

  • 1State Key Laboratory of Electroanalytical Chemistry, Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin, 130022, P. R. China. weilinxu@ciac.ac.cn.

Faraday Discussions
|December 7, 2021
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Summary

Researchers developed a novel platinum-copper (PtCu) alloy catalyst for direct methanol fuel cells (DMFCs). This PtCu catalyst demonstrates significantly enhanced activity, CO tolerance, and durability for methanol electro-oxidation in acidic environments.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Direct methanol fuel cells (DMFCs) require efficient and durable catalysts for methanol electro-oxidation in acidic media for commercial viability.
  • Existing platinum-based catalysts often suffer from performance limitations and CO poisoning.

Purpose of the Study:

  • To develop a facile synthesis method for carbon-supported platinum-copper (PtCu) alloy nanoparticles (NPs) with improved catalytic properties.
  • To evaluate the performance of the synthesized PtCu alloy catalyst for methanol electro-oxidation in acid media.

Main Methods:

  • A one-pot synthesis strategy was employed to create carbon-supported PtCu alloy NPs with controlled composition and morphology.
  • Electrochemical techniques were used to assess the catalytic activity, CO tolerance, and durability of the PtCu/C catalyst compared to commercial Pt/C.

Main Results:

  • The synthesized Pt2Cu/C catalyst exhibited a Pt-rich surface, small particle size, and uniform dispersion.
  • The Pt2Cu/C catalyst showed a 4.5-fold increase in mass activity and improved CO tolerance and durability over commercial Pt/C.
  • Enhanced performance is attributed to high Pt utilization, specific surface facets, and a downshifted Pt d-band center due to Cu addition.

Conclusions:

  • The developed Pt2Cu/C catalyst offers superior performance for methanol electro-oxidation in acid media, addressing key challenges in DMFC technology.
  • This study presents an effective strategy for designing advanced Pt-based alloy catalysts for various electrochemical applications.