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Abstract
A 3D-nanonet structured cobalt-basic-carbonate precursor has been obtained by a facile,
low cost and eco-friendly route under ambient temperature and pressure. After calcination
in air, the as-prepared precursor was converted to a 3D-nanonet hollow structured
Co3O4 with its original frame structure almost preserved. Encouragingly, by alternating
experimental parameters (Table S1 in the Supporting Information ), such as concentration
of the starting reagents and calcination temperature, we got the optimized condition
for the final product with desirable electrochemical performance (Figure S1 in the
Supporting Information ). The pseudocapacitive properties of the obtained Co3O4 were
evaluated by cyclic voltammetry (CV), galvanostatic charge-discharge measurement and
electrochemical impedance spectroscopy in 6.0 M KOH solution. At different scan rates
of 5, 10, 20, and 30 mV s(-1), the corresponding specific capacitances were 820, 755,
693, and 656 F g(-1), respectively. The material also exhibited superior charge-discharge
stability and maintained 90.2% of its initial capacitance after 1000 continuous charge-discharge
cycles at a current density of 5 A g(-1). From a broad view, our research and the
outstanding results not only present a feasible access to nanostructured Co3O4 but
also remind us of paying more attention to the simple synthetic methods without complex
processes and sophisticated instruments.