V. Rajendran
K.S. Rangasamy College of Technology
India
Title: : Nano-sized porous mno2 nano particles for electrochemical super capacitor utilizing neutral electrolytes
Biography
Biography: V. Rajendran
Abstract
Electrochemical Capacitors (ECs) are attracting energy storage device have gained enormous attention in recent years due to their higher power density and longer cycle-life compared to batteries. It finds potential application like hybrid electric vehicles and pulse power sources for many electronic devices. Different materials are explored as possible electrodes for ECs in aqueous electrolytes including carbonaceous materials, conducting polymers, and transition-metal oxides. Among many transition-metal oxides, MnO2 is the most promising electrode material due to its cheaper, abundance, and environmentally friendly nature. Even though, the theoretical specific capacitance of MnO2 is ~1380 F/g, only less than 30% of its value being realized. Thus, there is a demand for newer material to fulfill the electrochemical properties of charge storage mechanism as electrode. In this study, we synthesis porous MnO2 nanoparticles with large surface area through soft template method using cationic surfactant. The electrochemical measurements are carried out in a three electrode experimental set-up with MnO2 slurry coated SS plate as a working electrode. The Pt foil is used as a counter electrode, while Ag/AgCl is used as a reference electrode. The electrochemical studies namely cyclic voltammetry, chronopotentiometry and impedance spectroscopy are performed in alkali metal sulphate electrolytes (Li2SO4, Na2SO4 and K2SO4). The observed results reveal that porous MnO2 nanoparticles exhibit ideal capacitive behaviour in all electrolytes. Furthermore, an increased capacitance is explored in Na2SO4 electrolyte compared to other electrolytes. Thus, it is evident from the above study that capacitance achieved in Na2SO4 electrolyte is more suitable for ECs applications.