https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46101 2O₄ materials with different morphologies including spherical, urchin, rod and granular are synthesized using different surfactants. These electrode materials display the maximum specific capacity of 419, 543, 506, and 456 C g⁻¹ at 1 A g⁻¹ respectively in 2 M KOH. The optimized urchin-like NiCo₂O₄ is hybridized with different concentration of NiCo₂O₄ nanosheets. The hybridization process significantly increased the specific capacity to 1029 C g⁻¹ at 1 A g⁻¹ for NiCo₂O₄@ZnCo₂O₄-2 (NZC2). In order to make the hybrid supercapacitor device, honeycomb porous structured N-doped activated carbon is prepared with the Ricinus Communis seed. The prepared material shows an interconnected pore structure with a high nitrogen content and exhibits the maximum specific capacity of 236 C g⁻¹ at a current density of 1 A g⁻¹. The hybrid supercapacitor device made from NZC2 and the N-doped activated carbon offers the highest energy density of 101.6 W h kg⁻¹ with the corresponding power density of 1.62 kW kg⁻¹.]]> Fri 11 Nov 2022 09:59:14 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46950 2O₄@ZnCo₂O₄ (RNZC) ternary composite material is synthesized using a simple hydrothermal method. In this report, we demonstrate the effect of rGO concentration on the electrochemical behavior of the rGO/NiCo₂O₄@ZnCo₂O₄ composite materials. The specific capacity values of the ternary composite materials increase with rGO concentration up to 50 mg. Furthermore, on increasing the rGO concentration, the capacity value decreases. Among the prepared samples, the composite with 50 mg of rGO (RNZC3) exhibits a maximum specific capacity of 1197 C g^–1 at a current density of 1 A g^–1. We also demonstrate the design of a supercapacitor device with high specific energy density using RNZC3. The RNZC3//RNZC3 symmetric supercapacitor device exhibits a maximum energy density of 62 W h kg^–1. In the case of an asymmetric supercapacitor device, the applied potential range is extended beyond the water decomposition range. Enhancement of the potential window ensures to achieve a high energy density. The RNZC3//rGO asymmetric supercapacitor device reaches the highest energy density of 71 W h kg^–1 and the corresponding power density is 0.98 kW kg^–1.]]> Fri 09 Dec 2022 14:35:39 AEDT ]]>