Fabrication of nanosheets Co3O4 by oxidation-assisted dealloying method for high capacity supercapacitors

Co3O4 nanosheets were straightforwardly fabricated through in-situ dealloying and oxidation process of etching Al65Co35 alloy in 1M NaOH solutions. It exhibited a high specific capacitance of 5747mFcm−2 at a current density of 5mAcm−2 and good rate capability. Meanwhile, the capacitance retention ke...

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Bibliographic Details
Published in:Materials letters 2016-12, Vol.184, p.181-184
Main Authors: Wang, R., Qi, J.Q., Sui, Y.W., Chang, Y., He, Y.Z., Wei, F.X., Meng, Q.K., Sun, Z., Zhao, Y.L.
Format: Article
Language:English
Subjects:
Capacitance
Cobalt oxides
Corrosion
Current density
Dealloying
Electrodes
Etching
Free-standing
Nanosheets Co3O4
Nanostructure
Oxidation
Supercapacitors
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Summary:Co3O4 nanosheets were straightforwardly fabricated through in-situ dealloying and oxidation process of etching Al65Co35 alloy in 1M NaOH solutions. It exhibited a high specific capacitance of 5747mFcm−2 at a current density of 5mAcm−2 and good rate capability. Meanwhile, the capacitance retention keeps about 108.7% of the initial value after 1000 cycles at a current density of 30mAcm−2. The simple synthetic process and all these impressive results demonstrated that the Co3O4 electrode with flower-like nanoplates is promising for practical applications in supercapacitors. •Co3O4 nanosheets have been synthesized by in-situ dealloying and oxidation.•Large-scale Co3O4 nanosheets regard as binder-free electrodes.•Co3O4 nanosheets exhibit high specific capacity and cycling stability.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2016.08.049