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• Xu, C
• Wang, X
• Wu, X
• Cao, Y
• Scott, K
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• Wang, X
• Wu, X
• Cao, Y
• Scott, K
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• Wang, X
• Wu, X
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• Scott, K

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Membranes 2012, 2(3), 384-394; doi:10.3390/membranes2030384

Article

A Composite Membrane of Caesium Salt of Heteropolyacids/Quaternary Diazabicyclo-Octane Polysulfone with Poly (Tetrafluoroethylene) for Intermediate Temperature Fuel Cells

Chenxi Xu ^† , Xu Wang ^† , Xu Wu, Yuancheng Cao and Keith Scott*

School of Chemical Engineering & Advanced Materials, Newcastle University, Newcastle NE1 7RU, UK ^† These authors contributed equally to this work.

* Author to whom correspondence should be addressed.

Received: 8 May 2012; in revised form: 7 June 2012 / Accepted: 28 June 2012 / Published: 10 July 2012

(This article belongs to the Special Issue Membranes for Electrochemical Energy Applications)

Download PDF Full-Text [647 KB, uploaded 10 July 2012 09:10 CEST]

Abstract: Inorganic-organic composite electrolyte membranes were fabricated from Cs_XH_3−XPMo₁₂O₄₀ (CsPOMo) and quaternary diazabicyclo-octane polysulfone (QDPSU) using a polytetrafluoroethylene (PTFE) porous matrix for the application of intermediate temperature fuel cells. The CsPOMo/QDPSU/PTFE composite membrane was made proton conducting by using a relatively low phosphoric acid loading, which benefits the stability of the membrane conductivity and the mechanical strength. The casting method was used in order to build a thin and robust composite membrane. The resulting composite membrane films were characterised in terms of the elemental composition, membrane structure and morphology by EDX, FTIR and SEM. The proton conductivity of the membrane was 0.04 S cm⁻¹ with a H₃PO₄ loading level of 1.8 PRU (amount of H₃PO₄ per repeat unit of polymer QDPSU). The fuel cell performance with the membrane gave a peak power density of 240 mW cm⁻² at 150 °C and atmospheric pressure.

Keywords: composite membrane; intermediate temperature fuel cells; heteropolyacids; microporous PTFE; polysulfone

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