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Erschienen in:
01.06.2015
Birnessite MnO2-decorated hollow dandelion-like CuO architectures for supercapacitor electrodes
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 6/2015
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Abstract
Birnessite MnO2-decorated hollow dandelion-like CuO architectures are synthesized by a simple hydrothermal method in which tetraoctylammonium bromide is used as surfactant. X-ray diffraction spectroscopy and field emission scanning electron microscopy are applied to investigate the structure and morphology of the as-synthesized dandelion-like CuO hollow sphere and CuO/MnO2 core–shell nanostructures. Furthermore, the electrochemical properties of CuO/MnO2 core–shell structures electrodes are elucidated by cyclic voltammograms, galvanostatic charge/discharge tests and electrochemical impedance spectroscopy in 1 M Na2SO4 electrolyte. The result shows specific capacitance of 228 F g−1 and a long-term cycling stability which retains 82.2 % of its initial capacitance even after 5000 cycles. Such a facile strategy to fabricate the hierarchical CuO/MnO2 core–shell structures with significantly improved functionalities opens up a novel avenue to design electrode materials on demand for high-performance supercapacitor applications.