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Title: Citric acid functionalized carbon materials for fuel cell applications
Authors: Poh, C.K. 
Lim, S.H.
Pan, H. 
Lin, J. 
Lee, J.Y. 
Keywords: Citric acid
Functionalization of carbon materials
Methanol electro-oxidation
Platinum nanoparticle electrocatalyst
Proton-exchange membrane fuel cell
Issue Date: 21-Jan-2008
Citation: Poh, C.K., Lim, S.H., Pan, H., Lin, J., Lee, J.Y. (2008-01-21). Citric acid functionalized carbon materials for fuel cell applications. Journal of Power Sources 176 (1) : 70-75. ScholarBank@NUS Repository.
Abstract: Carbon materials can be easily functionalized using citric acid (CA) treatment. The CA modification of carbon materials is both simple and effective. It requires no prolonged heating, filtration and washing, and produces more functional groups such as carboxyl and hydroxide on CA-modified carbon nanotubes and XC72 carbon blacks than on HNO3-H2SO4 oxidized carbon nanotubes and as-purchased XC72. Platinum nanoparticles are deposited on these functionalized carbon materials by means of a microwave-assisted polyol process. The investigations using TEM, XRD, FTIR and TGA indicate that CA modification creates more functional groups and thus deposits more Pt nanoparticles with smaller average particle size on the surface of carbon materials. Electrochemical studies of the Pt/C samples for methanol oxidation reveal higher activity for Pt on CA-modified carbon materials. It is therefore considered that this method can find important applications in reducing the cost and improving performance of proton-exchange membrane fuel cells. © 2007 Elsevier B.V. All rights reserved.
Source Title: Journal of Power Sources
ISSN: 03787753
DOI: 10.1016/j.jpowsour.2007.10.049
Appears in Collections:Staff Publications

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