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Fast Removing Ligands from Platinum-Based Nanocatalysts by a Square-Wave Potential Strategy.

Rui Xu1, Lingshan Liao1,2, Wenya Liang1

  • 1College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang, 311121, China.

Angewandte Chemie (International Ed. in English)
|June 5, 2025
PubMed
Summary

A new square-wave potential (SWP) strategy rapidly removes ligands from platinum nanocatalysts. This method is 30x more efficient than traditional techniques, enabling cleaner nanocatalysts for improved research.

Keywords:
Catalytic activityLigand removalMethanol oxidation reactionOxygen reduction reactionPt‐based nanocatalysts

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Area of Science:

  • Nanotechnology
  • Electrochemistry
  • Catalysis

Background:

  • Ligand removal from nanoparticle surfaces is essential for developing effective nanocatalysts.
  • Current methods for ligand removal are often inefficient and time-consuming.

Purpose of the Study:

  • To develop a novel and highly efficient method for removing ligands from platinum-based nanocatalyst surfaces.
  • To investigate the mechanism of ligand removal using the new strategy.

Main Methods:

  • Development of a square-wave potential (SWP) strategy for ligand removal.
  • Utilizing in situ electrochemical infrared and Raman spectroscopy to study the removal mechanism.
  • Testing the SWP strategy on platinum and platinum-based alloy nanocatalysts with various ligands.

Main Results:

  • The SWP strategy achieved efficient ligand removal from platinum nanocatalysts in under 1 minute, with 30x higher efficiency than cyclic voltammetry.
  • Spectroscopic analysis revealed the formation of Pt-O-NH2R intermediates and subsequent ligand detachment.
  • The SWP method demonstrated versatility for different ligands and platinum-based alloy nanocatalysts.

Conclusions:

  • The SWP strategy offers a rapid, efficient, and versatile approach for ligand removal from nanocatalysts.
  • This method is crucial for ensuring reproducibility and revealing intrinsic catalytic effects.
  • The findings pave the way for cleaner nanocatalysts in various applications.