The role of tungsten oxide in enhancing the carbon monoxide tolerance of platinum-based hydrogen oxidation catalysts

Douglas W. G. Stewart, Keith Scott, Andrew J. Wain, Timothy E. Rosser, Edward Brightman, Donald MacPhee, Mohamed Mamlouk

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Significant reductions in total cost of ownership can be realized by engineering PEM fuel cells to run on low-purity hydrogen. One of the main drawbacks of low-purity hydrogen fuels is the carbon monoxide fraction, which poisons platinum electrocatalysts and reduces the power output below useful levels. Platinum-Tungsten oxide catalyst systems have previously shown high levels of CO tolerance during both ex situ and in situ investigations. In this work, we explore the mechanism of enhanced tolerance using in situ electrochemical attenuated total reflection-infrared (ATR-IR) and Raman spectroscopy methods and investigate, using a mixture of Pt/C and WO3 powders, the role of the WV/WVI redox couple in the oxidation of adsorbed CO.

Original languageEnglish
Pages (from-to)37079-37091
Number of pages13
JournalACS Applied Materials and Interfaces
Volume12
Issue number33
Early online date21 Jul 2020
DOIs
Publication statusPublished - 19 Aug 2020

Keywords

  • ATR-IR
  • carbon monoxide oxidation
  • fuel cell
  • hydrogen
  • platinum
  • tungsten trioxide

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