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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.

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