Abstract
Mesoporous Co(OH) 2 was synthesized by using CH 3(CH 2) 10CH 2OSO 3Na as soft template and urea as hydrolysis-controlling agent. The composition and microstructure of Co(OH) 2 was investigated by X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM) and nitrogen adsorption and desorption isotherms. Structure characterizations indicated a good mesoporous structure for the prepared Co(OH) 2 with adsorption average pore diameter of 11 nm and Brunauer–Emmett–Teller (BET) specific surface area of 283 m 2 g −1. Cyclic voltammogram, galvanostatic charge–discharge test, and electrochemical impedance spectroscopy (EIS) analysis showed that the Co(OH) 2 possessed good capacitive behavior. The maximum specific capacitance of 341 F g −1 was obtained for the mesoporous Co(OH) 2 at a charge/discharge current density of 5 mA cm −2.
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