Effect of chemical oxidation of CNFs on the electrochemical carbon corrosion in polymer electrolyte membrane fuel cells

Title
Effect of chemical oxidation of CNFs on the electrochemical carbon corrosion in polymer electrolyte membrane fuel cells
Authors
오형석김광현고영진김한성
Keywords
Carbon nanofibers; Acid treatment; Carbon supports; Carbon corrosion; Fuel cells; Polymer electrolyte membrane; fuel cell
Issue Date
2010-01
Publisher
International journal of hydrogen energy
Citation
VOL 35, NO 2-708
Abstract
Effect of chemical oxidation of carbon nanofibers (CNFs) on the electrochemical carbon corrosion in polymer electrolyte membrane (PEM) fuel cells is examined. With increasing time of chemical oxidation treatment using an acidic solution, more oxygen functional groups are formed on the surface of CNF resulting in an increasingly hydrophilic carbon surface. This effect contributes to improvements in Pt loading and the distribution of Pt particles on carbon supports. However, the chemical oxidation treatment is found to accelerate electrochemical carbon corrosion. The oxygen functional group and the hydrophilic nature of CNFs after chemical oxidation treatment are believed to encourage the formation of CO2, which is a product of carbon corrosion. From the observed results, it can be concluded that the chemical oxidation of CNFs is beneficial for catalyst loading and distribution. On the other hand, however, it reduces the durability of the PEM fuel cells caused by the electrochemical carbon corrosion. (C) 2009 Professor T. Nejat Veziroglu.
URI
http://pubs.kist.re.kr/handle/201004/67024
ISSN
0360-3199
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KIST Publication > Article
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