Highly stable Pt/ordered graphitic mesoporous carbon electrocatalysts for oxygen reduction

Gaurav Gupta, Daniel A. Slanac, Pavan Kumar, Jaclyn D. Wiggins-Camacho, Jeongnam Kim, Ryong Ryoo, Keith J. Stevenson, Keith P. Johnston

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

Abstract

In this manuscript, we have synthesized a stable fuel cell catalyst composed of presynthesized Pt nanocrystals (<4 nm) on graphitic mesoporous carbon. The catalyst shows negligible loss in mass activity and active surface area after an accelerated durability test (1000 cycles, 0.5-1.2 V), whereas the commercial Pt on amorphous carbon loses ∼70% in activity and area. Strong Pt-graphite interactions, resulting from metal/support orbital overlap (π-backbonding) coupled with partial charge transfer, as shown by XPS, and a low coverage of weakly bound ligands on the Pt surface facilitated high dispersion and loadings up to 20 wt %. The high oxidation resistance of the graphitized carbon, along with the strong Pt-C interactions, helped to maintain electrical contact between the metal and carbon while mitigating Pt dissolution, ripening, and coalescence. The ability to disperse well-defined metal nanoparticles onto graphitic mesoporous carbon offers the potential for creating highly stable and active catalysts.

Original languageEnglish
Pages (from-to)10796-10805
Number of pages10
JournalJournal of Physical Chemistry C
Volume114
Issue number24
DOIs
Publication statusPublished - 24 Jun 2010
Externally publishedYes

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