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Poly(vinylpyrrolidone)-Modified Graphite Carbon Nanofibers as Promising Supports for PtRu Catalysts in Direct Methanol Fuel Cells
Abstract
Carbon nanomaterials, including herringbone graphite carbon nanofibers (GNFH), multiwalled carbon nanotubes (MWCNT), and carbon black, were surface-modified by a new poly(vinylpyrrolidone) (PVP) grafting process as well as by the conventional acid-oxidation (AO) process, and characterized by FTIR, TGA, Raman, HRTEM, XRD, and XPS measurements. Pt nanoparticles of 1.8 nm were evenly deposited on all PVP-grafted carbon nanomaterials. The effects of the two surface modification processes on the dispersion, average Pt nanoparticle sizes, the electrocatalytic performance, and electrical conductivities of Pt-carbon nanocomposites in direct methanol oxidation were systematically studied and compared. It was found that the PVP-grafted carbon nanomaterials have much less loss in the electric conductivity and thus better electrocatalytic performance, 17-463% higher, than their corresponding acid oxidation-treated nanocomposites. The electrocatalytic performance of the Pt-carbon nanocomposites decreases in the following order: Pt-PVP-GNFH > Pt-PVP-MWCNTarc > Pt-AO-MWCNTarc > Pt-PVP-MWCNTCVD > Pt-AO-MWCNTCVD > Pt-XC-72R > Pt-AO-GNFH, with the Pt-PVP-GNFH nanocomposite having approximately 270% higher performance than that of the Pt-Vulcan XC-72R nanocomposite. In addition, PtRu-PVP-GNFH shows even better (50% higher) electrocatalytic activity than the Pt-PVP-GNFH nanocomposite at a 0.6 V applied voltage.
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Cited by
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Sharma, S., & Pollet, B. G. (2012) · Journal of Power Sources · doi:10.1016/j.jpowsour.2012.02.011 · Cited by 1,206
Novel catalyst support materials for PEMfuelcells: current status and future prospects
Shao, Y., Liu, J., Wang, Y., & Lin, Y. (2009) · J. Mater. Chem. · doi:10.1039/b808370c · Cited by 660
Kim, J. H., Fang, B., Song, M. Y., & Yu, J.-S. (2012) · Chemistry of Materials · doi:10.1021/cm203520a · Cited by 72
Chen, J., Wang, J., Chen, J., & Wang, L. (2017) · Journal of Materials Science · doi:10.1007/s10853-017-1410-1 · Cited by 49
Metadata
- Authors
- Hsin, Y. L., Hwang, K. C., & Yeh, C.-T.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-07-21
- Volume
- 129
- Issue
- 32
- Pages
- 9999-10010
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1991803078
- Cited by
- 467
- References
- 0
- FWCI
- 17.05
- Type
- journal article
- Language
- en
- Open access
- closed
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