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Composite membranes of polybenzimidazole and caesium-salts-of-heteropolyacids for intermediate temperature fuel cells

Lookup NU author(s): Dr Xu Wu, Xu Wang, Professor Mohamed MamloukORCiD, Emeritus Professor Keith Scott

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Abstract

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.

Publication metadata

Author(s): Xu CX, Wu X, Wang X, Mamlouk M, Scott K

Publication type: Article

Publication status: Published

Journal: Journal of Materials Chemistry

Year: 2011

Volume: 21

Issue: 16

Pages: 6014-6019

Print publication date: 16/03/2011

ISSN (print): 0959-9428

ISSN (electronic): 1364-5501

Publisher: Royal Society of Chemistry

URL: http://dx.doi.org/10.1039/c1jm10093a

DOI: 10.1039/c1jm10093a

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