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Uncovering Structural Evolution during the Dealloying Process in Pt-Based Oxygen-Reduction Catalyst.

Huijuan Zhang1, Minyuan Tan1, Longfei Hu1

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Understanding alloy catalyst dealloying is key for oxygen reduction reaction (ORR) design. This study reveals PtTe alloy reconstruction, forming a defect-rich Pt catalyst with enhanced ORR performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Designing alloy catalysts for the oxygen reduction reaction (ORR) requires a deep understanding of the dealloying process.
  • The precise mechanisms of leaching and reconstruction in dealloyed catalysts remain largely unelucidated.

Purpose of the Study:

  • To investigate the dealloying process of a two-dimensional PtTe ordered alloy using in situ techniques.
  • To elucidate the structural evolution and its impact on ORR activity.

Main Methods:

  • Utilized in situ X-ray absorption fine structure (XAFS) spectroscopy to monitor the dealloying of PtTe alloy.
  • Characterized the ORR performance of the resulting dealloyed catalyst.

Main Results:

  • Observed unsynchronous evolution of Platinum (Pt) and Tellurium (Te) sites during dealloying.
  • Pt structural transformation occurred before complete Te leaching, yielding a defect-rich Pt catalyst.
  • The dealloyed catalyst demonstrated superior ORR activity (0.90 V half-wave potential, 0.62 A mgPt-1 mass activity) compared to commercial Pt/C.

Conclusions:

  • The study provides critical insights into the dealloying mechanism of PtTe alloys.
  • The findings facilitate the development of advanced, high-performance Platinum-based alloy catalysts for ORR applications.