Nanostructure and surface composition of Pt and Ru binary catalysts on polyaniline-functionalized carbon nanotubes

Huang Yu Lee, Walter Vogel, Peter Po Jen Chu

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Pt-Ru binary catalysts were prepared on a polyaniline-functionalized multiwalled carbon nanotube (PANi/MWCNT). PANi/MWCNT composites were synthesized by the polymerization of aniline in the presence of a carbon nanotube suspension using FeSO 4 and (NH 4) 2S 2O 8 as the oxidants. The Pt-Ru/PANi/MWCNT catalysts were formed by the chemical reduction of H 2PtCl 6 and RuCl 3 using NaBH 4 as the reducing agent. The binary component catalyst is sharply distributed, with particle sizes ranging from 2.0 to 4.0 nm, and the Pt and Ru distributions are homogeneous when supported on PANi/MWCNT. In comparison, the binary catalyst supported on bare MWCNT displayed a Pt-rich core and a Ru-rich shell nanostructure. The surface composition deduced from CO stripping potentials confirms that the Ru surface content (π Ru) is approximately 50% for the Pt-Ru alloy on PANi/MWCNT, and the catalyst on bare MWCNT shows nearly 70% Ru on the surface. Pt-Ru binary catalysts supported on PANi/MWCNT have higher activity, a higher Pt utilization efficiency, and much better durability when compared to other catalyst supports on bare MWCNT or on Vulcan XC-72.

Original languageEnglish
Pages (from-to)14654-14661
Number of pages8
JournalLangmuir
Volume27
Issue number23
DOIs
StatePublished - 6 Dec 2011

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