Tychyna S. Structural-chemical correspondence between carbon electrode materials and electrolytes for electrical double layer capacitors

Compounds that decompose under heating inside the micropores and form products that can interact with the surface of active carbon (e.g. formic acid) have been utilized for the first time for the structural modification of carbon materials. The ratio between activating agent and carbon material was optimized, treatment regimes were developed, a positive effect of the modification on electrochemical parameters of electric double layer capacitors (EDLC) based on the modified active carbon was shown. Nitrogen-containing powdery substances (e.g. melamine) have been utilized for the first time for chemical modification of carbon materials. The ratio between activating agent and carbon material was optimized, treatment regimes were developed, a positive effect of the modification on electrochemical parameters of EDLCs based on the modified active carbon was shown. A method of nuclear magnetic resonance in the technique of a pulse field gradient stimulated echo (NMR PGSTE) has been utilized for the first time to study the electrolyte ions mobility in the porous matrix of electrode materials of EDLC. The results of determination of the electrolyte effective diffusion coefficients in the pores obtained with the use of NMR PGSTE were confirmed by independent method of voltammetry with rotating disk electrode with the use of "ferrocene / ferrocenium" redox couple in acetonitrile solution as a model. The prospects of proposed methods for optimization of the electrochemical systems of EDLC have been shown.