Performance of pseudo-capacitive porous electrodes for super-capacitors

Abstract

The specific energy of commercial available Batteries ranges between 10 (for lead acid batteries) and 100Wh/Kg (Li-ion batteries) and few hours of charging time. Modern Li-ion batteries can be changed faster but still not fast enough for many applications such as braking energy recovery and charging processes in satellites. Supercapacitors are electrochemical capacitors that can be charged only within few seconds at cost of the energy density compared to batteries. There is an urgent need to develop new materials in order to improve the energy density of supercapacitors. Pseudo-capacitors are one kind of supercapacitors which contain metal oxides and their redox reactions which considerably improve the electrical energy stored in this materials. In this work, MnOx and MnCoOx oxides were prepared by electrochemical deposition as well as sputtering technique to develop new electrodes for energy storage. The effect of the process parameters to the coating composition, microstructure and performance of the electrodes in different electrolytes are analyzed.