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Lookup NU author(s): Dr Xu Wu,
Dr Mohamed Mamlouk,
Emeritus Professor Keith Scott
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Inorganic-organic composite electrolyte membranes were fabricated from Cs substituted heteropolyacids (CsHPAs) and polybenzimidazole (PBI) for application in intermediate temperature hydrogen fuel cells. Four caesium salts of heteropolyacid, (CsXH3-XPMo12O40 (CsPOMo), CsXH3-XPW12O40 (CsPOW), CsXH4-XSiMo12O40 (CsSiOMo) and CsXH4-XSiW12O40 (CsSiOW)), were used to form composite membranes with PBI. The membranes were characterized by using SEM, FTIR and XRD. The CsHPA powders were nano-sized as shown in the XRD and SEM data. The CsHPA/PBI composite membranes loaded with H3PO4 had high conductivity, greater than that of a phosphoric acid loaded PBI membrane. The conductivity increased with an increase in the percentage of the powder in the composite. The 30% CsPOMo/PBI/H3PO4 exhibited a conductivity of 0.12 S cm(-1) under anhydrous conditions, although its mechanical strength was the poorest, but still promising with a value 40 MPa. The performance of the hydrogen fuel cell with composite membranes was better than that with a phosphoric acid-doped PBI membrane under the same conditions. The CsPOMo gave the best power density of around 0.6 W cm(-2) with oxygen at atmospheric pressure.
Author(s): Xu CX, Wu X, Wang X, Mamlouk M, Scott K
Publication type: Article
Publication status: Published
Journal: Journal of Materials Chemistry
Print publication date: 16/03/2011
ISSN (print): 0959-9428
ISSN (electronic): 1364-5501
Publisher: Royal Society of Chemistry
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