Synergistic Approach with Redox Additive for the Development of Environment Benign Hybrid Supercapacitor

Abstract

In the present work, capacitive features of mango kernel derived active carbon-based supercapacitor with environment benign sodium acetate (1M CH 3 COONa) (not holding harmful F-and S-compound) and CH 3 COONa added K 4 Fe(CN) 6 -redox additive electrolyte are explored. Variety of techniques (BET, XRD, SEM, RAMAN & FTIR) are used to characterize the active material. The specific surface area from the BET method is found to be 1133 m 2 g −1 . The supercapacitor cell fabricated by using CH 3 COONa delivers specific capacitance and energy of 92 F/g and 7.1 Wh/Kg, respectively. Interestingly, 2-3 times enhancement in capacitance (197 F/g) and energy (18.2 Wh/Kg) are observed for the addition of K 4 Fe(CN) 6 into CH 3 COONa, which is associated with the faradaic redox reaction between [Fe(CN) 6 ] −4 /[Fe(CN) 6 ] −3 redox couple. For comparison purpose 1M Na 2 SO 4 (with and without K 4 Fe(CN) 6 ) are also used as electrolytes to fabricate supercapacitor and this comparison concludes the better capacitive performance of environment benign CH 3 COONa electrolytes based supercapacitors in all scenarios. Moreover, the cycle life test (for 5000cycles) and thermal effects (in the temperature range of 20°C-70°C) are explored for the fabricated cell. In all these test, K 4 Fe(CN) 6 based redox systems are found to leave its ample effect on the supercapacitor performance, positively.

Fabrication of Binder‐Free TiO2 Nanofibers@Carbon Cloth for Flexible and Ultra‐Stable Supercapacitor for Wearable Electronics

“…Here, R s is the solution/ohmic resistance, which indicates the combination of the resistance between the material/substrate interface, the internal resistance of the substrate and the active material, and the electrolyte ionic resistance. [ 30 ] The R p and C dl signify the resistance due to the faradic charge transfer process at the interface of electrode/electrolyte and the double‐layer capacitance, respectively. [ 29 ] Warburg impedance ( W ) indicates the ionic diffusion process in the electrode material.…”

Fabrication and characterization of supercapacitor comprising mango kernel derived electrode under different electrolyte system

“…Synthesis procedure adopted for the e ‐trode material was similar to our reported work 32 . At first the raw material (mango kernel) is converted into the charcoal by applying heat treatment (300°C for 5 hours) to it in muffle furnace.…”

Role of Carbon Nanotube for Flexible Supercapacitor Application

“…Figure 10b shows the cyclic stability of the fabricated YSC device before and after cycling wherein the impedance spectroscopy data are evaluated by utilizing ZView software and the examined data are displayed with their equivalent electrical circuit [98] in the inset of Figure 10b. In the equivalent electrical circuit, R s signifies the ohmic resistance, R p and C dl denotes the faradic charge transfer resistance at the electrode/electrolyte interface and the double-layer capacitance, respectively, while W is associated with the Warburg impedance [99]. The two important terms such as energy and power densities are the very critical terms, which determine the performance of the SC devices.…”