Promising aquivion composite membranes based on fluoroalkyl zirconium phosphate for fuel cell applications
Date
2014
Authors
Donnadio, A.
Pica, M.
Subianto, S.M.
Jones, D.J.
Cojocaru, P.
Casciola, M.
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Journal article
Citation
ChemPhysChem, 2014; 7(8):2176-2184
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Abstract
Layered zirconium phosphate (ZP) that bears fluorinated alkyl chains bonded covalently to the layers (ZPR) was used as a nanofiller in membranes based on a short-side-chain perfluorosulfonic acid (PFSA) to mechanically reinforce the PFSA hydrophobic component. Compared to the pristine PFSA, membranes with a ZPR loading up to 30 wt% show enhanced mechanical properties, and the largest improvement of elastic modulus (E) and yield stress (sY) are observed for the 10 wt% ZPR membrane: DE/E up to 90% and DsY/sY up 70% at 70 8C and 80% relative humidity (RH). In the RH range 50–95 %, the in-plane conductivity of the composite membranes reaches 0.43 S cm 1 for 10 wt% ZPR at 1108C and is on average 30% higher than the conductivity of the pristine PFSA. The 10 wt% ZPR membrane is as hydrated as the neat PFSA membrane at 50% RH but becomes progressively less hydrated with increasing RH both at 80 and 110 8C. The fuel cell performance of this membrane, at 808C and 30% RH, is better than that of the unmodified PFSA.
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Data source: Supporting information, https://doi.org/10.1002/cssc.201402209
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Copyright 2014 Wiley-VCH Verlag