A.R Mad ram - Departmen t of Applied Chemistry, Malek Ashtar U niversity of Technology, Isfahan, Iran.
F Khashei - Department of Chemistry, Payame No or University, Isfahan, Iran.

Electrochemical energy stor age and co nversion systems include batteries, fuel cells and electroc hemical su percapacit ors. Two ty pe of electrochemical supercapacitors are currently under developme nt, namely, the elect ric double-layer capacitor (EDLC) and redox-or pseudocapacitor (P sC). They have attracted much attention due to their h igh power a nd high capacitance. Energ y storage arises mainly from the separation of electronic and ionic charges at the i nterface b etween elec trode materials with a high specific area a nd the electrolytic solutio ns. In this research work, a new composite m aterial (nickel/nano-porous carbon or Ni-NPC) was develo ped for supercapacitors. Ni-NPC was produced by electrolytic de position. Electrochemical i mpedance spectroscopy is a me thod to measure complex imped ance of electroc hemical cells. EIS has been applied to study the conductivity of the electro des. The measurements were performed at open circuit poten tial with a signal amplitude of ۵ mV. The spectra were acquired in a frequency range of ۱۰۰ m Hz-۱۰۰ kH z in NaOH ۱M and acetonitril electrolytes.

Nick el/Nano-P orous Carbon (Ni- NPC) Nan ocomposit e, Superc apacitor, Electrochemical I mpedance Spectroscopy (EIS)