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 1 M NaOH solutions. It exhibited a high specific capacitance of 5747 mF cm−2 at a current density of 5 mA cm−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 30 mA cm−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.