Electrolyte plays a significant role in improving the stability and specific capacity of supercapacitors however it has gained less attention compared to the designing of electrode materials. This study presents supercapacitor application of novel Prussian blue analog (PBA) based fabricated electrode in different electrolytes. The PBA has been derived by ligand substitution of sodium pentacyanonitrosyl ferrate(III) dihydrate followed by precipitation with cobalt salt to yield cobalt pentacyano(methylaniline)ferrate(II) (CoPCF). The fabricated electrode exhibited specific capacity of 390, 233, 175, and 83 mAh g-1 in 3M KOH, 1M NaOH, 1M LiOH, and 1M KNO3 at 1 A g-1 with capacity retention of 88.80%, 89.95%, 92.42% and 90.80%, respectively after 1000 continues charge discharge cycles. Furthermore, a solid-state asymmetric supercapacitor (ASCs) device was fabricated using PVA/KOH polymer gel electrolyte that exhibited specific capacity of 56 mAh g-1 with specific energy density of 71 Wh Kg-1 and specific power density of 2560 W Kg-1 at current density of 1 A g-1, with excellent capacity retention of 93% over 2000 continues (dis)charge cycles. These results demonstrated that the introduction of organic ligand in the framework of PBAs along with the selection of right electrolyte is an effective strategy in development high capacity and stabile supercapacitor electrode.

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