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Kwon, Yongchai
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article
Direct growth of FeCo2O4 nanowire arrays on flexible stainless steel mesh for high-performance asymmetric supercapacitor
Abstract
Currently, one-dimensional nanostructured binary metal oxides attract a great attention in supercapacitors (SCs) application due to their rapid charge transportation. In this respect, different nanostructures of FeCo<sub>2</sub>O<sub>4</sub> are designed by simply tuning the reaction temperature in hydrothermal synthesis. These nanostructures are directly grown on flexible stainless steel mesh and further applied as binder-free electrodes for SCs. The systematic study is carried out to confirm the relation between surface characteristics and electrochemical properties of FeCo<sub>2</sub>O<sub>4</sub> thin film. Among different nanostructures, FeCo<sub>2</sub>O<sub>4</sub> nanowire arrays exhibit hierarchical mesoporous structure and demonstrate good surface properties including high surface area and appropriate pore volume. As a consequence, relatively high specific capacitance of 1963 F g<sup>−1</sup> is obtained for the FeCo<sub>2</sub>O<sub>4</sub> nanowire electrode. Further, asymmetric SC is fabricated using nanowired-FeCo<sub>2</sub>O<sub>4</sub> and nanoparticulated-MnO<sub>2</sub> thin films as negative and positive electrodes with neutral Na<sub>2</sub>SO<sub>4</sub> electrolyte. Impressively, the MnO<sub>2</sub>//FeCo<sub>2</sub>O<sub>4</sub> cell could be successfully cycled in a wide voltage window of 2.0 V, which can achieve a specific capacitance of 218 F g<sup>−1</sup> and energy density of 43 Wh kg<sup>−1</sup>. In addition, the SCs exhibit improved capacitance with cycling, which is attributed to opening of micro-pores occurred by frequent ion transport.