Polyvinylpyrrolidone-assisted polyol synthesis of NiO nanospheres assembled from mesoporous ultrathin nanosheets

被引:16
作者
Dam, Duc Tai [1 ]
Lee, Jong-Min [1 ]
机构
[1] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637459, Singapore
关键词
Polyvinylpyrrolidone; Supercapacitor; NiO; Porosity; NICKEL-OXIDE NANOWIRES; SUPERCAPACITOR; ARRAYS; CAPACITANCE; ELECTRODE;
D O I
10.1016/j.electacta.2013.07.008
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A facile solvothermal technique is developed to prepare a nickel oxide precursor which is subsequently calcined in air at 300 degrees C for 4h to convert it to NiO nanospheres. These nanospheres are assembled from ultrathin mesoporous nanosheets that possess high surface areas. The final product is characterized by various techniques: thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron spectroscopy, and nitrogen adsorption-desorption method. Such a highly desired structure with a great surface area of 213 m(2)/g is believed to be formed through the Ostwald ripening mechanism. Electrochemical measurements show that our electrode can exhibit a high specific capacitance of 803 Fg(-1) at a discharge current density of 2 A g(-1). The electrode also possesses excellent long-term stability in an alkaline electrolyte. These interesting properties promote it to be a potential supercapacitor electrode material. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:617 / 623
页数:7
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