First-Principles Study on CO Removing Mechanism on Pt-Decorated Oxygen-Rich Anode Surfaces (Pt2/o-MO2(110), M = Ru and Ir) in DMFC

Chi You Liu, Chun Chih Chang, Jia Jen Ho, Elise Y. Li

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Direct methanol fuel cell (DMFC) is an efficient power source. However, the DMFC anodes are easily toxified by CO or other hydrocarbons, which terminates the methanol oxidation reaction (MOR). The most commonly used high performance catalyst on DMFC anodes is Pt or bimetallic PtRu. In this work, we apply density functional theory (DFT) to investigate the adsorption of CO and H2O on pristine Pt2/MO2(110) and the oxygen-rich Pt2/o-MO2(110) surfaces (M = Ru and Ir). We find that the application of the oxygen-rich surfaces significantly reduces the adsorption energies of CO and H2O molecules as well as the major reaction barrier (CO + OH → CO2) in the water-gas-shift-like (WGS-like) reactions forming CO2. Our detailed analyses on the electronic interaction between the catalysts and adsorbates indicate that Pt2/o-MO2(110) may be a promising DMFC anode material, which reduces the poison problem, and that it may be the actual experimental system that is responsible for the observed efficient CO removal.

Original languageEnglish
Pages (from-to)9825-9832
Number of pages8
JournalJournal of Physical Chemistry C
Volume121
Issue number18
DOIs
Publication statusPublished - 2017 May 11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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