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Updated: Jul 16, 2026

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Immiscible Metal-Regulated Surface Segregation Enables Core-Shell Bi-PtMn Catalysts With Benchmark Performance in

Shao Ye1,2, Yanhong Xie3, Lecheng Liang1

  • 1The Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China.

Advanced Materials (Deerfield Beach, Fla.)
|July 15, 2026
PubMed
Summary

A new Bi-PtMn catalyst offers superior CO tolerance for methanol oxidation reactions. This core-shell structure enhances activity and selectivity, paving the way for efficient direct methanol fuel cells.

Keywords:
CO‐free pathwaycore‐shell structureintermetallic compoundsmethanol oxidation reaction (MOR)surface segregation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Bi-Pt catalysts show promise for methanol oxidation reaction (MOR) due to CO tolerance.
  • Controlling Bi-Pt surface structures at the atomic level is challenging, leading to activity-selectivity trade-offs.

Purpose of the Study:

  • To develop a novel core-shell Bi-PtMn catalyst for enhanced MOR performance and selectivity.
  • To engineer atomic-level surface structures for improved electrocatalyst design.

Main Methods:

  • Immiscible-metal-induced surface-segregation strategy using Mn and Bi.
  • Synthesis of a core-shell structure with an L1 0-PtMn core and PtBi shell.
  • Electrochemical characterization and theoretical calculations, including kinetic isotope effect (KIE) measurements.

Main Results:

  • The Bi-PtMn catalyst achieved a mass activity of 61.81 A mgPt -1, significantly outperforming Bi-Pt and Pt/C.
  • Demonstrated excellent selectivity towards the CO-free pathway in MOR.
  • Achieved a peak power density of 294.21 mW cm -2 in direct methanol fuel cells at low Pt loading.
  • Mn facilitated C─H bond cleavage, lowering the rate-determining step barrier.

Conclusions:

  • The developed core-shell Bi-PtMn catalyst offers a promising solution for efficient methanol oxidation.
  • Immiscible metal thermodynamics provides a viable strategy for atomic-level surface engineering of electrocatalysts.
  • This approach enables simultaneous optimization of activity and selectivity for fuel cell applications.