Faculty Publications
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Item Single step synthesis of rGO, copper oxide and polyaniline nanocomposites for high energy supercapacitors(Elsevier Ltd, 2018) Viswanathan, A.; Nityananda Shetty, A.N.Reduced graphene oxide, copper oxide and polyaniline (GCP) nanocomposites possessing energy densities close to many of Li-ion batteries are synthesized by facile in-situ single step chemical method by varying the weight percentage of each of the constituent materials. Of all the composites synthesized, the one with weight percentage of G12%: Cu2O/CuO40%: P48% (G12CP) exhibits the maximum specific capacitance of 684.93 F g?1, specific capacity of 821.91 C g?1, energy density of 136.98 W h kg?1, and power density of 1315.76 W kg?1 at the current density of 0.25 A g?1. The composite shows the retention of 84% of its initial capacitance up to 5000 cycles at a scan rate of 700 mV s?1. The electrochemical performance of G12CP is superior to the performances of other ternary composites and those of binary composites synthesized with respective weight ratios as that of G12CP composite. The potential of G12CP to act as a secondary power backup device is successfully demonstrated and the performance obtained is comparable with some of the previously reported similar works, and even superior to some others. © 2018 Elsevier LtdItem Enhancement of supercapacitance of reduced graphene oxide, copper oxide and polyaniline using the mixture of methane sulphonic acid and sulphuric acid as electrolyte(Elsevier Ltd, 2021) Viswanathan, A.; Nityananda Shetty, A.N.The mixture of mineral acid and organic acid as aqueous electrolyte for the rGO12%: Cu2O/CuO40%: PANI48% (G12CP) nanocomposite, exhibited superior energy storage performance. The acid mixture electrolyte used is 0.4 M H2SO4 + 0.4 M CH3SO3H (1:1) (SA + MSA) and it exhibited enhanced diffusion and kinetic features in comparison with the bare 0.4 M H2SO4 (SA) and 0.4 M CH3SO3H (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 (Cs) 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 LtdItem High energy supercapattery of polyaniline/cupric oxide/stannic oxide nanocomposite(Elsevier Ltd, 2024) Viswanathan, A.; Nityananda Shetty, A.N.The effects of different aqueous acid electrolytes in imparting different features of energy storage to the nanocomposite of PANI50 %: CuO41.7 %: SnO28.3 % (PCS) are studied with three different electrolytes 1 M H2SO4 (SA), 1 M H2SO4 + 1 M CH3SO3H (1:1) (SA + MSA) and acidified by-product (ABP). In the presence of SA, SA + MSA and ABP, the PCS produces, high energy density (E); high E & cyclic stability; and high E & rate capability, respectively. The maximum energy characters are achieved in the presence of SA + MSA. They are specific capacity (Q) of 301.6 C g−1, E of 50.26 W h kg−1 and power density (P) of 1.200 kW kg−1 at 1 A g−1. In the presence of SA + MSA the PCS nanocomposite exhibits 55.56 % retention of its initial Q up to 12500 cycles at 0.4 V s−1. This achieved high E is similar with E of Ni–Cd batteries. The use of by-product as electrolyte for supercapattery makes the process a green process. © 2024 Elsevier Ltd