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PERFORMANCE OF POLYMER ELECTROLYTE MEMBRANE FUEL CELL USING DIFFERENT HYDROGEN FLOW RATE

On increasing the flow rate of hydrogen from 3.84 cc/ min to 15.5 cc/ min into a polymer electrolyte membrane fuel cell (PEMFC) operated at 30 o C using a 25 cm 2 self humidifying nafion membrane, the maximum voltage output increased from 0.813 V to 0.993 V DC. The steady state voltage output was almost independent of hydrogen flow rate. The time required to achieve the maximum voltage was longer for lower flow rate. After cutting off the hydrogen flow rate, the PEMFC continued to provide output voltage and current up to 3 minutes and afterwards in a decreasing order up to 3-5 minutes. The cell was able to show a persistent voltage of about 0.0733 V for long time.