Research Student Presentation
Dear All,
DEPARTMENT OF INSTRUMENTATION AND APPLIED PHYSICS
Research Student Presentation
NAME OF THE CANDIDATE : Miss. Sumana Kumar
DEGREE : Ph.D.
TITLE OF THE PRESENTATION : Supercapacitors: Insights into charge storage
mechanism and performance analysis.
SUPERVISOR : Prof. Abha Misra.
DATE & TIME : Wednesday, 08th May, 2019 at 2. 30 P.M
VENUE : Seminar Hall, Dept. of Instrumentation &
Applied Physics
Abstract
Rapid globalization has resulted in ever increasing energy demands due to which researchers worldwide are focusing on the development of new kinds of energy storage devices. Supercapacitor, also called the electrochemical capacitor, being one of them has tremendous potential to enable major advances in energy storage. The operating principle of supercapacitor is governed by the same fundamental equations as a conventional capacitor. However, supercapacitor utilizes high surface area electrodes and thinner dielectrics to achieve higher capacitances. This allows achieving higher energy densities than those of conventional capacitors and power densities than those of batteries. Hence, supercapacitors can complement or replace batteries in applications demanding high power densities related to electrical energy storage and harvesting applications. Supercapacitors can be distinguished into different categories depending on charge storage mechanism and active material used. Electrical double-layer capacitors, the most common devices at present, use carbon based materials with high surface area as electrodes. Pseudo capacitors or redox capacitors, use fast and reversible surface or near surface reaction for charge storage. They utilize metal oxides as well as electrically conducting polymers as electrodes. Hybrid capacitors, combining a capacitive or pseudo-capacitive electrode with a battery electrode, are the latest kind of supercapacitors, which benefit from both the capacitor and the battery properties. A brief discussion on each of these types with respective advantages and disadvantages will be presented. The electrolyte, involved in the measurement process, provides a determining factor related to operating voltage which in turn influences the power and the energy densities. Hence, this presentation will also throw lights on the importance of choosing a proper electrolyte for optimum performances. The various parameters involved in the capacitance measurement process will also be discussed.
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ALL ARE WELCOME
CHAIRMAN
Date/Time
Date(s) - 08/05/2019
2:30 pm - 3:30 pm
Seminar Hall, Dept. of Instrumentation and Applied Physics
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