Lookup NU author(s): Chenxi Xu,
Dr Yuancheng Cao,
Dr Xu Wu,
Professor Keith Scott
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Polybenzimidazole/graphite oxide (PBI/GO) and PBI/sulfonated graphite oxide composite membranes were prepared for high temperature polymer electrolyte membrane fuel cells. The membranes were loaded with phosphoric acid to provide suitable proton conductivity. The PBI/GO and PBI/SGO membranes were characterized by XRD which showed that the d-spacing reflection (001) of SGO in PBI matrix was shifted from 2 theta = 11 degrees, meaning that the PBI molecules were intercalated into the SGO layers during the membrane preparation process. A low acid loading level reduced the free acid in the membranes which avoided water loss and thus conductivity loss. The ionic conductivities of the PBI/ GO and PBI/ SGO membranes, with low acid loading, were 0.027 S cm(-1) and 0.052 S cm(-1) at 175 degrees C and 0% humidity. Fuel cell performance with SGO/PBI membranes gave a maximum power density of 600 mW cm(-2) at 175 degrees C.
Author(s): Xu CX, Cao YC, Kumar R, Wu X, Wang X, Scott K
Publication type: Article
Publication status: Published
Journal: Journal of Materials Chemistry
Print publication date: 27/06/2011
ISSN (print): 0959-9428
ISSN (electronic): 1364-5501
Publisher: Royal Society of Chemistry
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