Title

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

Document Type

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.

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