Highly stable and active Pt-Cu oxygen reduction electrocatalysts based on mesoporous graphitic carbon supports

Gaurav Gupta, Daniel A. Slanac, Pavan Kumar, Jaclyn D. Wiggins-Camacho, Xiqing Wang, Steven Swinnea, Karren L. More, Sheng Dai, Keith J. Stevenson, Keith P. Johnston

Research output: Contribution to journalArticlepeer-review

109 Scopus citations

Abstract

The activity of oxygen reduction catalysts for fuel cells often decreases markedly (30-70%) during potential cycling tests designed to accelerate catalyst degradation. Herein we achieved essentially no loss in electrochemical surface area and catalyst activity during potential cycling from 0.5 to 1.2 V for presynthesized Pt-Cu nanoparticles of controlled composition that were infused into highly graphitic disordered mesoporous carbons (DMC). The high stability is favored by the strong metal-support interactions and low tendency for carbon oxidation, which mitigates the mechanisms of degradation. Electrochemical dealloying transforms the composition from Pt20Cu80 to Pt85Cu15 with a strained Pt-rich shell, which exhibits an enhancedORRactivity of 0.46 A/mgPt,>4 fold that of pure Pt catalysts. The high uniformity in particle size and composition both before and after dealloying, as a consequence of the presynthesis/infusion technique, is beneficial for elucidating the mechanism of catalyst activity and, ul imately, for designing more active catalysts.

Original languageEnglish
Pages (from-to)4515-4526
Number of pages12
JournalChemistry of Materials
Volume21
Issue number19
DOIs
StatePublished - Oct 13 2009

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