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Bismuth Oxyhydroxide-Pt Inverse Interface for Enhanced Methanol Electrooxidation Performance.

Xuchun Wang1,2, Miao Xie1, Fenglei Lyu1

  • 1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, No. 199 Ren'ai Road, Suzhou 215123, Jiangsu, China.

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|September 22, 2020
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Summary

Researchers developed a novel bismuth oxyhydroxide-platinum inverse interface to enhance direct methanol fuel cells. This interface boosts catalyst performance by weakening CO adsorption and strengthening OH adsorption, improving methanol oxidation reaction efficiency and stability.

Keywords:
PtBiX-ray absorption spectroscopyelectrochemical reconstructioninverse interfacemethanol oxidation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Direct methanol fuel cells (DMFCs) require efficient electrocatalysts for methanol oxidation reaction (MOR).
  • Platinum (Pt)-based catalysts are crucial but suffer deactivation from carbonaceous intermediates like CO.
  • Developing stable and active Pt-based electrocatalysts remains a significant challenge for DMFC applications.

Purpose of the Study:

  • To create a bismuth oxyhydroxide (BiO(OH))-Pt inverse interface for enhanced MOR.
  • To investigate the structural and electronic properties of the interface using advanced characterization techniques.
  • To elucidate the mechanism behind the improved catalytic activity and stability.

Main Methods:

  • Electrochemical reconstruction to form the BiO(OH)-Pt inverse interface.
  • Density functional theory (DFT) calculations to model the interface.
  • X-ray absorption spectroscopy (XAS) and ambient pressure X-ray photoelectron spectroscopy (AP-XPS) for structural and electronic analysis.
  • Electrochemical characterizations to evaluate catalytic performance.

Main Results:

  • Formation of a stable BiO(OH)-Pt inverse interface was successfully demonstrated.
  • The interface induces electron deficiency in Pt, weakening CO adsorption and strengthening OH adsorption.
  • The Pt2Bi sample exhibited enhanced activity and stability for the methanol oxidation reaction.

Conclusions:

  • The BiO(OH)-Pt inverse interface effectively mitigates CO poisoning and facilitates MOR.
  • This study provides a fundamental understanding of inverse interface structures for electrocatalysis.
  • The findings offer a rational design strategy for advanced electrocatalysts in DMFCs.