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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Intermetallic PtCu Nanoframes as Efficient Oxygen Reduction Electrocatalysts.

Ho Young Kim1, Taehyun Kwon2, Yoonhoo Ha3

  • 1School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea.

Nano Letters
|September 14, 2020
PubMed
Summary

Atomically ordered platinum-copper (PtCu) nanoframes offer enhanced oxygen reduction reaction (ORR) activity and stability. This new catalyst design overcomes the instability challenges of traditional nanoframes, showing superior performance for fuel cell applications.

Keywords:
electrocatalystintermetallicnanoframeoxygen reduction reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Nanoframe alloy structures are promising catalysts for the oxygen reduction reaction (ORR) due to their high surface area and nanoconfinement effects.
  • However, the structural and chemical instability of nanoframes limits their practical application.
  • Developing stable and highly active nanoframe catalysts is crucial for advancing energy conversion technologies.

Purpose of the Study:

  • To synthesize and characterize atomically ordered platinum-copper (PtCu) nanoframes (O-PtCuNF/C) for improved ORR performance.
  • To investigate the role of the intermetallic L11 structure in enhancing catalytic activity and stability.
  • To compare the performance of O-PtCuNF/C with disordered PtCu nanoframes (D-PtCuNF/C) and commercial Pt/C catalysts.

Main Methods:

  • Theoretical composition predictions guided the rational design of the catalyst.
  • A silica-coating-mediated synthesis approach was employed to construct the O-PtCuNF/C.
  • Electrochemical techniques were used to evaluate ORR activity, durability, and chemical stability.

Main Results:

  • The synthesized O-PtCuNF/C exhibited significantly higher ORR activity and mass activity compared to D-PtCuNF/C and commercial Pt/C.
  • The intermetallic L11 structure of O-PtCuNF/C provided enhanced strain and ligand effects, boosting catalytic performance.
  • O-PtCuNF/C demonstrated superior durability and reduced etching of constituent atoms, indicating improved chemical stability.

Conclusions:

  • Atomically ordered PtCu nanoframes with an L11 intermetallic structure represent a highly active and stable catalyst for ORR.
  • The rational design combining theoretical predictions and a novel synthesis method is effective for creating advanced nanoframe catalysts.
  • These findings pave the way for developing next-generation catalysts for fuel cells and other electrochemical energy conversion devices.