In situ infrared study of carbon monoxide adsorbed onto commercial fuel-cell-grade carbon-supported platinum nanoparticles: Correlation with13C NMR results

Cynthia Rice, Yuye Tong, Eric Oldfield, Andrzej Wieckowski, Jean Michel Léger, Claude Lamy

Research output: Contribution to journalArticle

Abstract

Carbon monoxide chemisorbed via methanol dissociative chemisorption onto commercial fuel-cell-grade carbonsupported nanoscale platinum electrocatalysts has been investigated by in situ subtractively Normalized mterfacial Fourier /ransform infrared reflectance spectroscopy (SNIFTIRS). The infrared stretching frequency and the Stark tuning rate (i.e., the slope of stretching frequency vs electrode potential) show a strong dependence on platinum particle size. Five platinum particle sizes were analyzed; with average diameters of 2.0, 2.5, 3.2, 3.9, and 8.8 nm. The infrared stretching frequency was found to increase with increasing particle size, while the Stark tuning rate was found to decrease. These results were correlated with those obtained by using solid-state 13C NMR (Tong, Y. Y.; et al. J. Am. Cliem. Soc. 2000, 722, 1123-29), showing that the particle-size-dependent variations in the infrared stretching frequency and the Stark tuning rate are due to the variation in the 2π* back-donation from metal to CO caused by strong interactions between platinum nanoparticles and the conductive carbon support.

Original languageEnglish (US)
Pages (from-to)5803-5807
Number of pages5
JournalJournal of Physical Chemistry B
Volume104
Issue number24
StatePublished - Jun 22 2000

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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