期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 16, 页码 8029-8035出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm16057a
关键词
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资金
- National Natural Science Foundation of China [20927007, 21175094]
- Youth Foundation of Sichuan University [2010SCU11048]
A novel facile and template-free method to prepare a nanoball-like NiOx material has been developed. The preparation involves the synthesis of an alpha-Ni(OH)(2) precursor by microwave heating and calcination of the precursor. The NiOx material possesses a nanoball-like structure with a large surface area. The pseudo-capacitive properties of the NiOx material were evaluated by cyclic voltammetry and electro-chemical impedance spectroscopy in 6 M KOH solution. The specific capacitances were 951, 796, 713 and 650 F g(-1), corresponding to the scan rates of 2.0, 5.0, 10 and 20 mV s(-1), respectively. The NiOx material also showed excellent cycling stability and maintained 92% of its maximum specific capacitance after 1000 cycles. The hybrid supercapacitor based on this NiOx material exhibited moderate energy density and power density.
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