Viswanathan, A.Nityananda Shetty, A.N.2026-02-052021Chemical Engineering Science, 2021, 229, , pp. -92509https://doi.org/10.1016/j.ces.2020.116020https://idr.nitk.ac.in/handle/123456789/23393The mixture of mineral acid and organic acid as aqueous electrolyte for the rGO12%: Cu<inf>2</inf>O/CuO40%: PANI48% (G12CP) nanocomposite, exhibited superior energy storage performance. The acid mixture electrolyte used is 0.4 M H<inf>2</inf>SO<inf>4</inf> + 0.4 M CH<inf>3</inf>SO<inf>3</inf>H (1:1) (SA + MSA) and it exhibited enhanced diffusion and kinetic features in comparison with the bare 0.4 M H<inf>2</inf>SO<inf>4</inf> (SA) and 0.4 M CH<inf>3</inf>SO<inf>3</inf>H (MSA). SA + MSA provided 16.8% higher energy storage than the SA and the performance obtained after 5000 charge/discharge cycles is 276.98% higher than the performance obtained before the cyclic stability test using the same acid mixture electrolyte. The G12CP provided a specific capacitance (C<inf>s</inf>) of 490.19 F g?1, an energy density (E) of 98.0392 W h kg--1 and a power density (P) of 1.500l kW kg?1 at 1 A g?1 in the presence of SA + MSA. The obtained E is comparable with E of Li-ion batteries, Ni-metal hydride batteries, Na-S batteries, and Na-metal chloride batteries. © 2020 Elsevier LtdChlorine compoundsCopper oxidesElectrolytesEnergy storageGrapheneHydridesLithium compoundsLithium-ion batteriesMixturesNickel compoundsOrganic acidsOxide mineralsPolyanilineAqueous electrolyteCharge/discharge cycleCyclic stabilityEnhanced diffusionMethanesulphonic acidNi-metal hydride batteriesSpecific capacitanceStorage performanceSodium compounds