Nickel oxide/copper oxide composites are prepared. Then the composites were transferred into autoclave and thermal sinter under different temperature and different time. As-prepared composites were analyzed by XRD, and it was concluded that with the increase of hydrothermal time, content of NiO and Ni0.75Cu0.25O increases, but particles become smaller; it would improve the electrochemical activity. By SEM images directed lower crystallinity of composites, deeper porosity and rougher surface would have better electrochemical activity. The electrochemical performance was investigated by cyclic voltametry, AC impedance and galvanostatic charge-discharge. All results show that under the condition of 150°C 30 h, the electrochemical performance is the best. The specific capacitance was 225.67 F·g-1 at the charge-discharge current of 1 A·g-1.
References
[1]
Conway, B.E. (1991) Transition from “Supercapacitor” to “Battery” Behavior in Electrochemical Energy Storage. Journal of the Electrochemical Society, 138, 1539-1548. https://doi.org/10.1149/1.2085829
[2]
Futaba, D.N., Hata, K., Yamada, T., Hiraoka, T., Hayamizu, Y., Kakudate, Y., Tanaike, O., Hatori, H., Yumura, M. and Iijima, S. (2006) Shape-Engineerable and Highly Densely Packed Single-Walled Carbon Nanotubes and Their Application as Super-Capacitor Electrodes. Nature Materials, 5, 987-994. https://doi.org/10.1038/nmat1782
[3]
Faggiole, E., Rena, P., Danel, V. and Andrieuc, X. (1999) Supercapacitors for the Energy Management of Electric Vehicles. J. Power Sources, 84, 261-269. https://doi.org/10.1016/S0378-7753(99)00326-2
[4]
Zhang, Z.A. and Deng, M.G. (2003) Characteristics and Applications of Electrochemical Capacitors. Electronic Components & Materials, 22, 1.
[5]
Zhang, B.L., Zhao, H., Zhang, X. and Qian, L.J. (2003) Application of Supercapacitor in Hybrid Electric Vehicle. Automobile Research & Development, 5, 48.
[6]
Lam, L.T., Newnham, R.H., Ozgun, H. and Fleming, F.A. (2000) Advanced Design of Valve-Regulated Lead-Acid Battery for Hybrid Electric Vehicles. Journal of Power Sources, 88, 92-97. https://doi.org/10.1016/S0378-7753(99)00515-7
[7]
Zhang, S.S., Xu, K. and Jow, T.R. (2004) Electrochemical Impedance Study on the Low Temperature of Li-Ion Batteries. Electrochimica Acta, 49, 1057-1061. https://doi.org/10.1016/j.electacta.2003.10.016
[8]
Xu, M.W., Bao, S.J. and Li, H.L. (2007) Synthesis and Characterization of Mesoporous Nickel Oxide for Electrochemical Capacitor. Journal of Solid State Electrochemistry, 11, 372-377. https://doi.org/10.1007/s10008-006-0155-6
[9]
Kiani, M.A., Mousavi, M.F. and Ghasemi, S. (2010) Size Effect Investigation on Battery Performance: Comparison between Micro- and Nano-Particles of β-Ni(OH)2 as Nickel Battery Cathode Material. Journal of Power Sources, 195, 5794-5800. https://doi.org/10.1016/j.jpowsour.2010.03.080
[10]
Wang, X.F. (2003) Preparation of Ultra-Fine Ruthenium Oxide as an Electrode Materials for Electrochemical Capacitors. Chinese Journal of Inorganic Chemistry, 19, 371-375.
[11]
Cai, T., Zhu, P. and Ren, Z. (2014) Preparation and Performances of RuO2 and Its Composite Electrodes. Micronanoelectronic Technology, 8, 508-511.
[12]
Gujar, T.P., Shinde, V.R., Lokhande, C.D., et al. (2007) Spray Deposited Amorphous RuO2 for an Effective Use in Electrochemical Supercapacitor. Electrochemistry Communications, 9, 504-510. https://doi.org/10.1016/j.elecom.2006.10.017
