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Yadegari, Amir
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article
Nanostructured mixed transition metal oxides for high performance asymmetric supercapacitors: Facile synthetic strategy
Abstract
Exceptionally simple and cost-effective solid-state method is reported for the synthesis of different mixed transition metal oxides (MTMOs) including FeCo<sub>2</sub>O<sub>4</sub>, MnCo<sub>2</sub>O<sub>4</sub> and ZnCo<sub>2</sub>O<sub>4</sub> with unique nanostructures. The morphological analysis show that MTMOs possess distinct nanostructures such as tetragonal, spherical nanoparticles and hexagonal nanosheets. Furthermore, these MTMOs showed excellent supercapacitive properties with specific capacitances of 660–1263 F/g at current density of 2 A/g. Asymmetric capacitor was fabricated with FeCo<sub>2</sub>O<sub>4</sub> as positive and activated carbon as negative electrode which exhibits a specific capacitance of 88 F/g with energy density of 24 Wh/kg (1.1 mWh/cm<sup>3</sup>) and cycle life (93%) over 5000 cycles.