The size effect of titania-supported Pt nanoparticles on the electrocatalytic activity towards methanol oxidation reaction primarily via the bifunctional mechanism

Chao Cheng Ting, Chung Hsuan Liu, Chun Yen Tai, Shih Chieh Hsu, Chih Shuan Chao, Fu-Ming Pan*

*Corresponding author for this work

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

(Graph Presented) We prepared Pt nanoparticles of different particle sizes by plasma enhanced atomic layer deposition (PEALD) on the native oxide surface layer of Ti thin films, and investigated the Pt particle size effect on the electrocatalytic activity towards methanol oxidation reaction (MOR) in acidic media. The average Pt nanoparticles size ranges from 3 nm to 7 nm depending on the number of the PEALD reaction cycles. The electronic interaction between Pt nanoparticles and the TiO2 support is insignificant according to x-ray photoelectron spectroscopy analyses, suggesting that the influence of the Pt particle size on the electrocatalytic activity can be mainly described by the bifunctional mechanism. From cyclic voltammetry measurements, Pt particles of smaller size have a better CO tolerance in MOR. We proposed the reaction steps for the electrooxidation of CO adspecies on Pt nanoparticles on the basis of the bifunctional mechanism. The electrode with Pt nanoparticles of ∼5 nm in size shows the best electrocatalytic performance in terms of CO tolerance and electrochemical stability.

Original languageEnglish
Pages (from-to)166-172
Number of pages7
JournalJournal of Power Sources
Volume280
DOIs
StatePublished - 15 Apr 2015

Keywords

  • Bifunctional mechanism
  • Electronic effect
  • Methanol oxidation reaction
  • Plasma-enhanced atomic layer deposition
  • Pt nanoparticle
  • Titania

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