Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7737439 | Journal of Power Sources | 2014 | 6 Pages |
Abstract
A porous Co3O4 nanoflake array film grown on nickel foam is prepared by a hydrothermal synthesis for pseudo-capacitor application. The pseudocapacitive behavior of the Co3O4 nanoflake array is investigated by cyclic voltammograms (CV), galvanostatic charge-discharge tests and electrochemical impedance spectroscopy (EIS) in 2 M KOH at different temperatures. The specific capacity is 210, 289 and 351 F gâ1 at 2 A gâ1 tested at â5 °C, 25 °C and 60 °C, respectively, corresponding to that of 184, 243 and 242 F gâ1 at 20 A gâ1. After 4000 cycles at 2 A gâ1, the remaining specific capacity is 187, 342 and 124 F gâ1 tested at â5 °C, 25 °C and 60 °C. It shows that with increasing the temperature from â5 °C to 60 °C, the specific capacity increases, while the cycling stability becomes worse. The operation temperature has a pronounced influence on the pseudocapacitive performance of Co3O4 nanoflake array.
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Authors
Y.Q. Zhang, L. Li, S.J. Shi, Q.Q. Xiong, X.Y. Zhao, X.L. Wang, C.D. Gu, J.P. Tu,