Stable oxygen reduction electrocatalysts from presynthesized PdPt nanoparticles on carbon

D. A. Slanac, L. Li, K. J. Stevenson, K. P. Johnston

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

We have synthesized an oxygen reduction catalyst composed of pre-synthesized Pd3Pt2 alloy nanoparticles dispersed on Vulcan carbon. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) indicate the alloy particles are 4.0nm. The catalyst loses 20% of its activity after potential cycling from 0.5 V to 1.2 V (NHE) in HClO4 compared to 70% for commercial Pt/VC Even after 20% loss, the final activity of the Pd3Pt2/VC catalyst is 0.095 A/mgPt, equal to that of the fresh commercial PWC After cycling TEM shows only a small increase in particle size to 4.5nm, and X-ray photoelectron spectroscopy reveals no change in the oxidation states of the metals, indicating the stability may result from an increased dissolution resistance of the alloy relative to the base metals. The development of well-defined, stable, and active alloy catalysts facilitates a better understanding of structure-activity relationships and is encouraging for the application of commercially viable fuel cells.

Original languageEnglish
Title of host publicationPolymer Electrolyte Fuel Cells 10, PEFC 10
Pages161-170
Number of pages10
Edition1 PART 1
DOIs
Publication statusPublished - 2010
Externally publishedYes
Event10th Polymer Electrolyte Fuel Cell Symposium, PEFC 10 - 218th ECS Meeting - Las Vegas, NV, United States
Duration: 10 Oct 201015 Oct 2010

Publication series

NameECS Transactions
Number1 PART 1
Volume33
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

Conference10th Polymer Electrolyte Fuel Cell Symposium, PEFC 10 - 218th ECS Meeting
Country/TerritoryUnited States
CityLas Vegas, NV
Period10/10/1015/10/10

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