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The Role of Tungsten Oxide in Enhancing the Carbon Monoxide Tolerance of Platinum-Based Hydrogen Oxidation Catalysts

Stewart, Douglas W. G., Scott, Keith, Wain, Andrew J., Rosser, Timothy E., Brightman, Edward, Macphee, Donald, Mamlouk, Mohamed
ACS applied materials & interfaces 2020 v.12 no.33 pp. 37079-37091
Raman spectroscopy, carbon monoxide, catalysts, electrochemistry, fuel cells, hydrogen, hydrogen fuels, ownership, oxidation, platinum, powders, tungsten oxide
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.