Yulia G Mateyshina, Larisa Brezhneva and Nikolai F Uvarov
Noakhali Science and Technology University, Russia
Posters & Accepted Abstracts: J Fundam Renewable Energy App
Electrochemical double-layer capacitors have tremendous potential as high-energy and high-power sources for using in the low weight hybrid systems. Commercial applications for such devices include uninterruptible power applications, telecommunications, and public transportation. Electrochemical double layer capacitors, commonly called ├ó┬?┬?supercapacitors├ó┬?┬Ł, are intermediate systems that bridge the power/energy gap between traditional dielectric capacitors (high power) and batteries (high energy). Carbon-based supercapacitors have been largely investigated because of their low-cost, high cycle life and high capacitance. New microporous and mesoporous carbon electrode materials have been synthesized by template synthesis followed by carbonization and activation derived from phenol-formaldehyde or resorcin-formaldehyde resins, in which potassium hydroxide acts as both the catalyst of polymerization and the chemical activation reagent. The obtained carbons were characterized by a specific surface area of 1000-2000 m2/g. The aim of the work was to investigate the relationship between the specific capacitance and specific surface area in a series of materials prepared from different organic precursors. The electrochemical characteristics of electrode materials were investigated in a symmetrical two-electrode cell using an impedance spectroscopy, voltammetry in both potentiodynamic and galvanostatic modes. It was shown that the value of C for the materials under study strongly depended on the organic precursor and the type of electrolyte. The capacity diminishes at transition from organic to aqueous electrolytes and decreases in a series: 1M LiClO4 in acetonitrile > 1M H2SO4 > 6M KOH > 1M Li2SO4.
Yulia G Mateyshina has her own experience in the synthesis and study of electrochemical properties, electrode materials for lithium-ion batteries and supercapacitors. She has worked on the study of the electrode materials and solid electrolytes for medium electrochemical devices. She has succeeded in creating an all solid-state supercapacitor.