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Pan, G.X.; Xia, X.; Cao, F.; Tang, P.S.; Chen, H.F.
Electrochimica acta, 02/2012, Letnik: 63Journal Article
Porous Co(OH)2/Ni composite nanoflake array is prepared by combing hydrothermal synthesis and electrodeposition methods. The as-prepared Co(OH)2/Ni composite nanoflake array exhibits a highly porous array structure composed of free-standing nanoflakes with thicknesses of 35–40nm. The pseudocapacitive behavior of the Co(OH)2/Ni composite nanoflake array is investigated by cyclic voltammograms (CV) and galvanostatic charge–discharge tests in 2M KOH. As cathode material for supercapacitor, the porous Co(OH)2/Ni composite nanoflake array exhibits weaker polarization, higher electrochemical activity and better cycling performance as compared to the unmodified Co(OH)2 nanoflake array. The Co(OH)2/Ni composite nanoflake array shows specific capacitances of 1310Fg−1 at 1Ag−1 and 1148Fg−1 at 40Ag−1, much higher than those of the unmodified Co(OH)2 nanoflake array (1017Fg−1 at 1Ag−1 and 775Fg−1 at 40Ag−1). The enhancement of supercapacitor properties is due to the introduction Ni in the composite array, which improves the electric conductivity of the film electrode with fast reaction kinetics.
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