Abstract
A novel CuO electrode material with flower-like nanostructures was fabricated at a low temperature (80 °C) by a simple chemical precipitation method. Scanning electron microscopy (SEM) results showed that CuO with spherical and flower-like structure can be formed under a weak alkali (C 6H 12N 4), and CuO with sheets structure can be obtained under a strong alkali (NaOH). A possible growth mechanism of CuO nanocrystals was discussed. The flower-like CuO electrode exhibited a higher specific capacitance (133.6 Fg −1) and an excellent cycle performance at a high current density of 10 mA/cm 2. Specific capacitance of flower-like CuO was 405.3% higher than globular CuO (26.44 Fg −1) at 2 mA/cm 2.
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