The Role of Tungsten Oxide in the Enhancement of Carbon Monoxide Tolerance of Platinum-Based Hydrogen Oxidation Catalysis

ACS Applied Materials & Interfaces
Douglas StewartMohamed Mamlouk

Abstract

Significant reductions in total cost of ownership can be realised 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 in 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 spectroscopic 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.

References

May 13, 2003·Chemical Communications : Chem Comm·Takahiro YajimaMasahiro Watanabe
May 5, 2005·Journal of the American Chemical Society·Matthias ArenzNenad M Markovic
Jul 27, 2006·The Journal of Physical Chemistry. B·V StamenkovicN M Markovic
Jan 23, 2010·Physical Chemistry Chemical Physics : PCCP·Fabrice MicoudMarian Chatenet
Jun 18, 2017·ACS Applied Materials & Interfaces·Elisa AlbaneseGianfranco Pacchioni

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