The above trend in discharge characteristics can be
explained from the physical parameters of these materials
evaluated by surface area (Table1) and related parameters.
Black Pearls 2000 has the highest surface area and pore
volume than other carbon powders studied here. The reason
attributed for the improved electrochemical performance of
the Black Pearls 2000 may be the increased electrolyte
uptake and retention of large amount of electrolyte [11, 12]
an effect due to the improved physical characteristics of the
carbon powder. The better performance of composite
carbon can also be explained in a similar way, due to its
higher surface area and larger total pore volume than the
Vulcan XC72 and acetylene black.