Low EW Poly [perfluorosulfonic acids]/Phosphotungstic acid/Teflon® Supported Membrane Electrode Assemblies

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Article

Subject Area(s)

Chemical Engineering

Abstract

Two different fabrication procedures of catalyst coated membranes (CCMs) using 750 EW poly [perfluorosulfonic acid] ionomer composite membranes that contain phosphotungstic acid are discussed in this study. Cell polarization was obtained at three operating conditions: 80/100/75, 100/70/70, and 120/35/35 (cell temperature {degree sign}C/anode %RH/cathode %RH), and ambient pressure. Hydrogen/air cell performances at 120/35/35 and 400 mA/cm2 varied with the procedure from 0.39V to 0.64 V. Utilization of different fabrication procedures has a significant effect on electrode structure and thus relative overpotential, but little influence on membrane resistance and related ohmic loss. Although much higher performance occurred with the non-heat treatment process, durability issues require heat treatment for stabilization. Further study on the physical and chemical properties of the fabrication process of 750EW poly [perfluorosulfonic acid] ionomers/phosphotungstic acid CCMs is necessary to optimize both the performance and durability of elevated temperature and low relative humidity CCMs.

Rights

© ECS Transactions, 2008, Electrochemical Society

Li, B., Choi, P., Pearman, B.P., Rodgers, M., Agarwal, R., Mohajeri, N., Linkous, C.A., Wonseok, Y., Huang, X., Slattery, D., Bonville, L., Kunz, H.R., Fenton, J.M. (2008). Low EW Poly [perfluorosulfonic acids]/Phosphotungstic acid/Teflon® Supported Membrane Electrode Assemblies. ECS Transactions, 16(2), 1423-1431.

http://dx.doi.org/10.1149/1.2981983

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