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Kasim, Muhd Firdaus
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article
Flower-like nanosheets FeCo2O4 for application in supercapacitor and dye-sensitized solar cell
Abstract
<p>Four different iron cobaltite (FeCo<sub>2</sub>O<sub>4</sub>) structures namely nanoneedles, nanorods, nanosheets and microcubes have been obtained by varying the duration of hydrothermal reaction. The dependence of electrochemical properties on the FeCo<sub>2</sub>O<sub>4</sub> structures has been investigated. The FeCo<sub>2</sub>O<sub>4</sub> nanosheet have the highest specific capacitance (C<sub>sp</sub>), followed by nanorods, nanoneedles and microcubes. The highest C<sub>sp</sub> of FeCo<sub>2</sub>O<sub>4</sub> nanosheets is attributed to its highest specific surface area and pore volume. A solid-state asymmetric FeCo<sub>2</sub>O<sub>4</sub> nanosheet/polyvinyl alcohol—potassium hydroxide/reduced graphene oxide supercapacitor was fabricated. The supercapacitor exhibits maximum power density of 3202 W kg<sup>−1</sup> and maximum energy density of 24.5 Wh kg<sup>−1</sup>. It demonstrates 70% capacitance retention after 3000 cycles. The poly(vinylidene fluoride-co-hexafluoropropylene)/propylene carbonate/1,2-dimethoxyethane/1-methyl-3-propyl imidazolium iodide/sodium iodide/iodine/4-tert-butylpyridine/guanidine thiocyanate electrolytes were assembled into dye-sensitized solar cells (DSSCs) with FeCo<sub>2</sub>O<sub>4</sub> nanosheets or platinum as the counter electrodes. DSSC with FeCo<sub>2</sub>O<sub>4</sub> nanosheets counter electrode shows an efficiency of 6.04%.</p>