articleJournal of the American Chemical SocietyJan 11, 2024Closed access

Introducing Electron Buffers into Intermetallic Pt Alloys against Surface Polarization for High-Performing Fuel Cells

XLXuan LiuYWYuhan WangJLJiashun LiangSLShenzhou LiSZSiyang Zhang

Huazhong University of Science and Technology · Chinese Academy of Sciences · +3 more institutions

PubMed
Indexed incrossrefpubmed

Abstract

Surface polarization under harsh electrochemical environments usually puts catalysts in a thermodynamically unstable state, which strictly hampers the thermodynamic stability of Pt-based catalysts in high-performance fuel cells. Here, we report a strategy by introducing electron buffers (variable-valence metals, M = Ti, V, Cr, and Nb) into intermetallic Pt alloy nanoparticle catalysts to suppress the surface polarization of Pt shells using the structurally ordered L10-M-PtFe as a proof of concept. Operando X-ray absorption spectra analysis suggests that with the potential increase, electron buffers, especially Cr, could facilitate an electron flow to form a electron-enriched Pt shell and thus weaken the…

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Topics & keywords

Topics
Keywords
  • Chemistry
  • Intermetallic
  • Polarization (electrochemistry)
  • Fuel cells
  • Electron
  • Metallurgy
  • Chemical engineering
  • Physical chemistry
UN Sustainable Development Goals
  • Affordable and clean energy
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