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Atomic Diffusion Engineered PtSnCu Nanoframes with High-Index Facets Boost Ethanol Oxidation.

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  • 1Shenzhen Key Laboratory of Energy Electrocatalytic Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong, 518055, P. R. China.

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Summary

Developing advanced catalysts is key for efficient electrochemical ethanol oxidation. New platinum-tin-copper (Pt47Sn12Cu41) nanoframes significantly boost ethanol oxidation and CO removal in acidic electrolytes.

Keywords:
atomic diffusionelectrocatalysisethanol oxidationhigh‐index facetsnanoframes

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Electrochemical ethanol oxidation is vital for renewable energy conversion but suffers from low efficiency.
  • Developing efficient catalysts, particularly multimetallic nanoalloys, is crucial for improving this process.
  • Rational atomic-level engineering of active sites in nanoalloys remains a significant challenge.

Purpose of the Study:

  • To engineer a novel multimetallic nanoalloy for enhanced electrochemical ethanol oxidation.
  • To investigate the role of atomic tin (Sn) in tuning the catalytic activity of platinum-copper (PtCu) nanocrystals.
  • To develop a state-of-the-art electrocatalyst for efficient ethanol oxidation in acidic media.

Main Methods:

  • Synthesis of Pt47Sn12Cu41 octopod nanoframes via atomic Sn diffusion into PtCu nanocrystals.
  • Characterization of nanoframes enclosed by high-index facets like {331} and {221}.
  • Electrochemical evaluation of catalytic activity and density functional theory (DFT) calculations.

Main Results:

  • The Pt47Sn12Cu41 nanoalloy exhibited a high mass activity of 3.10 A mg-1 Pt.
  • Enhanced C-C bond breaking and oxidation of toxic carbon monoxide (CO) intermediates were observed.
  • DFT calculations confirmed Sn introduction uplifts the d-band center, improving electroactivity and CO oxidation.

Conclusions:

  • The developed Pt47Sn12Cu41 octopod nanoframes represent a highly efficient electrocatalyst for ethanol oxidation.
  • Atomic Sn integration effectively tunes the electronic structure and catalytic performance.
  • This work presents a promising strategy for designing tailored multimetallic nanoalloys for energy applications.