Supercapacitive Properties of Carbon Electrode in an Electrolyte Containing a Newly Synthesized Two-Cation Salt

Abstract

:To examine the effects of a two-cation ionic liquid as an electrolyte component of a supercapacitor, 1,4-bis(3-methylimidazolium-1-yl)butane tetrafluoroborate (MIBBF 4 ), dissolved in propylene carbonate (PC) or acetonitrile (ACN), is newly synthesized and tested here for potential use as an electrolyte of capacitor. The MIBBF 4 salt exhibits higher ionic conductivity in ACN than in PC. The supercapacitive properties of capacitors containing an activated carbon electrode and various electrolytes are evaluated using cyclic voltammetry and electrochemical impedance spectroscopy. The capacitor adopting the MIBBF 4 /ACN electrolyte shows the largest specific capacitance at low scan rates, whereas the capacitor adopting the 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF 4 )/ACN electrolyte shows the largest specific capacitance at high scan rates.

Activated Carbon Electrode From Desiccated Coconut Residue for High Performance of Supercapacitors

“…It exhibits typical double-layer capacitive behaviour. It was also found that the cathodic and anodic charging currents increased with scan rates indicating that dependence of the capacitance on the scan rates and a pure capacitive behaviour (Cho et al, 2011). A high rate scan could stimulate large ohmic resistance distorting the CV loop hence resulted in a narrower loop with an oblique angle (Cheng et al, 2014).…”