M. Ghouse et al., PREPARATION AND EVALUATION OF PTFE-BONDED POROUS GAS-DIFFUSION CARBONELECTRODES USED IN PHOSPHORIC-ACID FUEL-CELL APPLICATIONS, International journal of hydrogen energy, 20(9), 1995, pp. 727-736
Citations number
10
Categorie Soggetti
Energy & Fuels","Environmental Sciences","Physics, Atomic, Molecular & Chemical
This paper describes the preparation and evaluation of polytetrafluoro
ethylene-bonded gas diffusion porous carbon electrodes. The porous car
bon electrodes of size 200 cm(2) (20 cm x 10 cm) were prepared using a
rolling technique and characterized by employing porosimetry, energy
dispersive X-ray and scanning electron microscopy techniques. These ca
rbon 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 degrees C and 1 atm pressure. The current density values achie
ved for different carbon electrodes ranged from 600 to 750 mA cm(-2) w
ith H-2-O-2 and from 250 to 275 mA cm(-2) with H-2-air at 0.5 V, 175 d
egrees 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 degrees C and 1 atm pressure to study
their stability. The results of long-term testing of the monocelIs rev
ealed that all the cells were operated successfully with minimum degra
dation (similar to 10 mV per 600 h).