Abstract
Porous Co(OH)2 film directly grown on nickel foam is prepared by a facile hydrothermal method. The as-prepared Co(OH)2 film possesses a structure consisting of randomly porous nanoflakes with thicknesses of 20–30 nm. The capacitive behavior of the Co(OH)2 film is investigated by cyclic voltammograms and galvanostatic charge-discharge tests in 2 mol/L KOH. The porous Co(OH)2 film exhibits a high discharge capacitance of 935 F g−1 at a current density of 2 A g−1 and excellent rate capability. The specific capacitance keeps a capacitance of 589 F g−1 when the current density increases to 40 A g−1. The specific capacitance of 82.6% is maintained after 1500 cycles at 2 A g−1.
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Zhang, Y., Xia, X., Kang, J. et al. Hydrothermal synthesized porous Co(OH)2 nanoflake film for supercapacitor application. Chin. Sci. Bull. 57, 4215–4219 (2012). https://doi.org/10.1007/s11434-012-5291-z
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DOI: https://doi.org/10.1007/s11434-012-5291-z