Viswanathan, A.Nityananda Shetty, A.N.2026-02-032024Bulletin of Materials Science, 2024, 47, 4, pp. -2504707https://doi.org/10.1007/s12034-024-03329-7https://idr.nitk.ac.in/handle/123456789/20800The green energy storage of polyaniline, without major wastages excreted into the environment is effectively demonstrated by using the polyaniline as supercapacitor electrode and the by-product obtained during the synthesis of polyaniline as its electrolyte. This green approach to the energy storage properties of sulphuric acid doped polyaniline (H-PANI) exhibited a substantial improvement in its energy storage, compared to the conventional approach of using an ionically conducting liquid as electrolyte like 1 M H<inf>2</inf>SO<inf>4</inf> (SA), separately. The amelioration of 40.44% was achieved when the by-product obtained as supernatant liquid (SL) was used as electrolyte compared to SA. The H-PANI provided a specific capacity (Q) of 146.4 C g?1, a specific energy (E) of 24.40 W h kg?1 and a specific power (P) of 1.200 kW kg?1 at 1 A g?1 in the presence of SA. The Q of 205.6 C g?1, E of 34.26 W h kg?1 (similar range of E of Pb-acid batteries), P of 1.200 kW kg?1 were achieved in the presence of SL at 1 A g?1 and a high rate capability of 29.18% retention of initial Q up to 25 A g?1 was also achieved. This approach is useful to harvest high energy characters from PANI. © Indian Academy of Sciences 2024.ElectrolytesAcid-doped polyanilineBy-product electrolyteConventional approachEnergyEnergy storage propertiesGreen energySpecific energySulphuric acidSupercapacitor electrodesSupernatant liquidsCapacitor storage