Journal
ELECTROCHIMICA ACTA
Volume 107, Issue -, Pages 9-15Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.05.122
Keywords
NiO; NaBH4; Ethylene glycol; Electrode material; Supercapacitor
Categories
Funding
- National Basic Research Program of China [2012CB932303]
- National Natural Science Foundation of China [51172261]
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A facile reflux method has been developed to prepare porous NiO samples using NaBH4-EG and NaOH-EG as alkaline precipitants, respectively. NaBH4-EG is used as alkaline precipitant for the first time. Precipitants influence the morphology and structure of NiO significantly, further affect their specific capacitances as supercapacitor electrodes. Compared with NaOH, NaBH4-EG as alkaline precipitant shows great superiority on morphology control. NiO synthesized by NaBH4-EG presents spherical spongy shape with high specific surface areas, whereas the sample synthesized by NaOH-EG exhibits agglomerated irregular structure. When being applied as supercapacitor electrodes, the former NiO could achieve an extremely high specific capacitance of 930 F g(-1) at a current density of 15 A g(-1), significantly higher than that of the latter one (510 F g(-1)). Moreover, the specific capacitance of the former is as high as 1396 F g(-1) after 1000-cycle at 4 A g(-1), revealing superb electrochemical characteristics. The impedance measurement discloses that the electrode prepared by the former NiO possesses lower charge-transfer resistance and ion-diffusion resistance, demonstrating the superiority of NaBH4-EG as alkaline precipitant. NaBH4-EG is an excellent precipitant for the synthesis of porous NiO as supercapacitor electrodes. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
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