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Layer-by-layer polypyrrole coated graphite oxide and graphene nanosheets as catalyst support materials for fuel cells

Saner Okan, Burcu and Alkan Gürsel, Selmiye and Yürüm, Yuda (2011) Layer-by-layer polypyrrole coated graphite oxide and graphene nanosheets as catalyst support materials for fuel cells. (Accepted/In Press)

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Abstract

For the production of advanced type of catalyst support materials, the distinguished properties of graphene nanosheets were combined with the structural properties of conducting polypyrrole by the incorporation of graphene nanosheets into a polymer matrix by the proposed simple and low-cost fabrication technique. A precise tuning of electrical conductivity and thermal stability was also achieved by controlling the thickness of randomly dispersed graphene nanosheets by a layer-by-layer polymer coating. Initially, graphene nanosheets were fabricated in large quantities via a mild chemical synthetic route involving graphite oxidation, ultrasonic treatment and chemical reduction. Then, polypyrrole/graphene nanosheet composites with improved conductivity, thermal stability and high surface area were synthesized by in situ polymerization with the different pyrrole feed ratios. Although graphite oxide sheets have electrically insulating property, partially oxidized graphite oxide was also utilized as conductive fillers in polymer matrix. However, polypyrrole/graphene nanosheet composites have better electrical conductivity than polypyrrole/graphite oxide composites.

Item Type:Article
Uncontrolled Keywords:graphite oxide, graphene nanosheets, conducting polymer, nanocomposites, catalyst support
Subjects:T Technology > TP Chemical technology > TP0155-156 Chemical engineering
ID Code:17834
Deposited By:Yuda Yürüm
Deposited On:01 Jan 2012 22:05
Last Modified:09 Nov 2012 11:45

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