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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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High-Loading Pt-Co/C Catalyst with Enhanced Durability toward the Oxygen Reduction Reaction through Surface Au

Feng Wang1, Qi Zhang1, Zhiyan Rui1

  • 1National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, 210093 Nanjing, P.R. China.

ACS Applied Materials & Interfaces
|May 30, 2020
PubMed
Summary

High-loading platinum-cobalt (Pt-Co/C) catalysts were developed for proton exchange membrane fuel cells (PEMFCs). Surface gold modification enhanced durability and activity, crucial for practical PEMFC applications.

Keywords:
durabilityhigh Pt loadingoxygen reduction reactionproton exchange membrane fuel cellssurface Au modification

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Proton exchange membrane fuel cells (PEMFCs) require efficient cathode catalysts.
  • High platinum (Pt) loading on carbon supports (Pt-Co/C) is desirable for PEMFCs.
  • Achieving high Pt loading while maintaining small particle size (2-5 nm) and good durability is challenging.

Purpose of the Study:

  • To develop a method for preparing high-Pt-loading (>50 wt%) Pt-Co/C catalysts.
  • To enhance the catalytic activity and durability of these catalysts for PEMFCs.
  • To investigate the role of gold (Au) modification in improving catalyst performance.

Main Methods:

  • Developed a surfactant-free method for high-Pt-loading Pt-Co/C catalyst synthesis.
  • Employed one-step selective acid etching and surface Au modification.
  • Utilized low-temperature thermal treatment (150 °C) for catalyst preparation.

Main Results:

  • Synthesized Au-Pt-Co/C-0.015 catalyst with 50.2 wt% Pt loading and 3.42 nm particle size.
  • Achieved a mass activity (MA) 1.9 times higher than commercial Pt/C catalysts.
  • Demonstrated excellent durability with only 9.4% MA loss after 30,000 cycles.

Conclusions:

  • The developed synthesis strategy effectively produces high-loading Pt-based catalysts.
  • Surface Au modification significantly enhances catalyst durability by restricting Pt and Co dissolution.
  • The Au-Pt-Co/C catalysts show great promise for practical PEMFC applications.