Chronoamperometric Investigations of the Electrode-Electrolyte Interface of a Commercial High Temperature PEM Fuel Cell
Résumé
This paper presents investigations into the chronoamperometric experiments performed on polybenzimidazole (PBI) / phosphoric acid based high temperature polymer electrolyte membrane fuel cells (HT-PEM FC). Electrolyte loadings in the membrane electrode assembly (MEA) are varied to realize three different degrees of flooding of the electrode. Steady state as well as dynamic measurements at three different temperatures (160°C, 120°C and 80°C) is made via chronoamperometry on these cells. The transient current behavior resulting from a voltage step change from open circuit voltage (~ 1 V) to low voltages (0.1 V) are recorded and analyzed. Analysis using the Cottrell plot depicts the underlying mass transport processes in the three different electrodes, catalyst utilization as well as a better description of the three phase boundary reaction zone. An extension of the Cottrell equation is deduced to describe a regular commercial fuel cell behavior.
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