Abstract
This paper describes the preparation and evaluation of polytetrafluoroethylene-bonded gas diffusion porous carbon electrodes. The porous carbon electrodes of size 200 cm 2 (20 cm × 10 cm) were prepared using a rolling technique and characterized by employing porosimetry, energy dispersive X-ray and scanning electron microscopy techniques. These carbon electrodes were also evaluated as individual electrodes ( H 2 O 2 ) using a specially designed and fabricated half cell assembly as well as as complete Monocells with H 2-O 2 and H 2-air at a temperature of 175–180 °C and 1 atm pressure. The current density values achieved for different carbon electrodes ranged from 600 to 750 mA cm −2 with H 2-O 2 and from 250 to 275 mA cm −2 with H 2-air at 0.5 V, 175 °C and 1 atm pressure. Four phosphoric acid fuel cell monocells were tested continuously (24 h day −1) for 600 h (without applying an acid management system) at 175 °C and 1 atm pressure to study their stability. The results of long-term testing of the monocells revealed that all the cells were operated successfully with minimum degradation (~10 mV per 600 h).
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