Abstract:
This article is focused on polymer based gel electrolyte due to the fact that polymers
are cheap and can be used to achieve extended potential window for improved energy
density of the supercapacitor devices when compared to aqueous electrolytes. Electrochemical
characterization of a symmetric supercapacitor devices based on activated
carbon in different polyvinyl alcohol (PVA) based gel electrolyteswas carried out. The
device exhibited a maximum energy density of 24 Wh kg−1 when carbon black was
added to the gel electrolyte as conductive additive. The good energy densitywas correlated
with the improved conductivity of the electrolyte medium which is favorable for
fast ion transport in this relatively viscous environment. Most importantly, the device
remained stable with no capacitance lost after 10,000 cycles.
