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High Temperature Electrolyte Membrane Properties of MEA with Nafion and CSPPSU Membranes by Decal Method

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In this presentation, membrane electrode assembly (MEAs) were fabricated by the decal method using Nafion115 or CSPPSU membranes and catalysts coated on PTFE sheets. The water electrolysis characteristics were investigated using a self-made water electrolysis apparatus from 80°C to 150°C. The WU and conductivity of the Nafion115 and CSPPSU membranes were 38%, 47mS/cm (80°C, RH90%) and 37%, 12mS/cm (80°C, RH90%), respectively. The anode and cathode side electrodes (S=1cm2) were prepared by applying IrO2 (1 mg/cm2) and Pt/C (I/C=1) (Pt=1 mg/cm2) on PTFE sheets, respectively. The MEA was prepared by transferring the catalyst onto the membrane by hot pressing at 165°C or lower for 10 minutes. The cells were serpentine type, and the anode side was platinum coated. The anode supply water temperature was 80°C. Water supply rate is 2 ml/min. IV measurements were evaluated while increasing the Oven temperature from 80°C to 150°C. The characteristics of MEAs with Nafion115 and CSPPSU membranes showed an increase in current density and a decrease in membrane resistance and interface resistance with increasing cell temperature. The IV performance of the cell with CSPPSU membrane was comparable to that of the cell with Nafion115 membrane. These results suggest that CSPPSU membranes, which have a higher glass transition temperature than Nafion membranes, are expected to be applied to high-temperature water electrolysis.

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