Facile synthesis of alfa-nickel hydroxide by an ultrasound-assisted method and its application in energy storage devices
- Facile synthesis of alfa-nickel hydroxide by an ultrasound-assisted method and its application in energy storage devices
- 정광덕; 아사드 아바스; 이브라힘; 김성훈; 핫스나인
- Issue Date
- Applied surface science
- VOL 474-226
- Alfa-nickel hydroxide is prepared by a high-energy ultrasound (sonochemical) method that enables precise control over the reaction process. The prepared alfa-nickel hydroxide can be easily transformed into the beta phase of nickel hydroxide by adjusting the reaction time. BET analysis of the alfa-nickel hydroxide prepared in this method reveals a very high specific surface area (384  m2  g− 1), extraordinarily high pore volume (0.77  cm3  1) and mesoporous structure. Scanning electron microscopy images show that the alfa-nickel hydroxide has a worm-like morphology, whereas the beta phase exhibits a petal-like morphology. To investigate the electrochemical properties of the nickel hydroxide, it is first calcined to nickel oxide at 250  °C, and then the capacitance of the resulting NiO sample is measured by cyclic voltammetry, galvanostatic charge-discharge measurements and electrochemical impedance spectroscopy. When alfa-nickel hydroxide is converted to NiO, the BET surface area increases slightly, due to dehydroxylation and calcination at a relatively low temperature. However, the pore volume remains nearly constant. The high specific capacitance of 955  F  1 at the scan rate of 10  Ag− 1 is obtained for the NiO sample. The presence of mesopores and the high specific surface area enhance ion transport during the charge and discharge processes to enable high energy storage.
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