Electrochemical performance of hierarchical hollow CoMn<sub>2</sub>O<sub>4</sub> hanospheres <i>in-situ</i> grown on nickel foam as supercapacitor electrode materials
Hierarchical hollow nanospheres of cobalt manganese oxide(CoMn<sub>2</sub>O<sub>4</sub>) on nickel foam(NF) are facilely synthesized by a hydrothermal method and post heat treatment in air, and further characterized by diffraction of X-rays(XRD), field emission scanning elect...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN ZH |
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Academic Journals Center of Shanghai Normal University
2021
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| Acceso en línea: | https://doaj.org/article/088f3a824d3e4a26b89bb547b78c3005 |
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| Sumario: | Hierarchical hollow nanospheres of cobalt manganese oxide(CoMn<sub>2</sub>O<sub>4</sub>) on nickel foam(NF) are facilely synthesized by a hydrothermal method and post heat treatment in air, and further characterized by diffraction of X-rays(XRD), field emission scanning electron microscope (FE-SEM) and X-ray photoelectron spectroscopy(XPS). In a three-electrode system of electrochemical measurement, the areal capacitance of 0.1 Co<sup>2+</sup>-250 electrode material is as high as 6 184 mF·cm<sup>-2</sup> at 5 mA·cm<sup>-2</sup>. The hybrid supercapacitor assembled by 0.1 Co<sup>2+</sup>-250 as the positive electrode and commercial activated carbon (AC) as negative electrode presents a maximum energy density of 0.112 mWh·cm<sup>-2</sup> at 1.6 mW·cm<sup>-2</sup>. Even at the power density of 16 mW cm<sup>-2</sup>, the energy density still reaches 0.064 mWh·cm<sup>-2</sup>. After 10 000 charge/discharge cycles under the current density of 2 mA·cm<sup>-2</sup>, the capacitance retains 93% of the initial value. With excellent electrochemical performance and facilely cost-effective synthesis, such hierarchical CoMn<sub>2</sub>O<sub>4</sub> electrode material may hold great promise for high-performance supercapacitor applications. |
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