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Effect of heat treatment on PtRu/C catalyst for methanol electro-oxidation

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Abstract

The effect of heat treatment on a commercial PtRu/C catalyst was investigated with a focus on the relationship between electrochemical and surface properties. The heat treated PtRu/C catalysts were prepared by reducing the commercial PtRu/C catalyst at 300, 500, and 600 °C under hydrogen flow. The maximum mass activity for the methanol electro-oxidation reaction (MOR) was observed in the catalyst heat treated at 500 °C, while specific activity for the MOR increased with increasing heat treatment temperature. Cyclic voltammetry (CV) results revealed that the heat treatment caused Pt rich surface formation. The increase in surface Pt was confirmed by X-ray photoelectron spectroscopy; the surface (Pt:Ru) ratio of the fresh catalyst (81:19) changed to (87:13) in the 600 °C heat treated catalyst. Quantitative analysis of the Ru oxidation state showed that the ratio of metallic Ru increased with an increase in heat treatment temperature. On the other hand, RuOxHy completely reduced at 500 °C and the ratio of RuO2 slightly decreased with increasing heat treatment temperature.

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Acknowledgments

This research was partially funded by the Center for Ultramicrochemical Process Systems (CUPS) sponsored by KOSEF (2008). The authors also thank Research Park/LG Chem, Ltd. and Ministry of Commerce, Industry and Energy for funding this research in the framework of the Korean government/industry joint project for the development of 50 W direct methanol fuel cell systems.

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  1. Hee Jung Jeon

    Present address: Catalysis Technologies Lab., Corporate R&D Center, SK Energy, 140-1, Wonchon-dong, Yuseong-gu, Daejeon, 305-712, Republic of Korea

Authors and Affiliations

  1. Department of Chemical and Biomolecular Engineering (BK21 Graduate Program) & Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea

    Min Ku Jeon, Ki Rak Lee, Hee Jung Jeon & Seong Ihl Woo

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  1. Min Ku Jeon
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  2. Ki Rak Lee
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Correspondence to Seong Ihl Woo.

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Jeon, M.K., Lee, K.R., Jeon, H.J. et al. Effect of heat treatment on PtRu/C catalyst for methanol electro-oxidation. J Appl Electrochem 39, 1503–1508 (2009). https://doi.org/10.1007/s10800-009-9833-2

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  • DOI: https://doi.org/10.1007/s10800-009-9833-2

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