English to French Tech/Engineering Electronics / Elect Eng fuel cell membrane electrode assembly

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The membrane electrode assembly was incorporated into a single cell , a cell temperature was adjusted to 50°C, a 20% by weight aqueous solution of methanol was supplied at a rate of 0.5 ml/min to the anode side, synthetic air was supplied at a rate of 50 ml/min to the cathode side, and a voltage-current characteristic was measured using an evaluating apparatus, a potentiostat and a frequency response analyzer to read a voltage at a current density of 250 mA/cm2. Thereafter, an operation was performed for 100 hours at a constant current of 250 mA/cm2 in a pattern of 5 hour operation-1 hour idling. After a constant current evaluation, a voltage at a current density of 250 mA/cm2 was read from a current-voltage curve to calculate the voltage retention since the initial voltage.