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![Anodization fabrication techniques and energy-related applications for nanostructured anodic films on transition metals](https://image.oaes.cc/a039050a-9503-4666-9b1b-8c75a4ec1d39/5260.fig.4.jpg)
Figure 4. Cyclic voltammograms of (a) CuO nanowires, (b) CuO nanosheets and (c) CuO nanoflowers recorded in a 6.0 mol L-1 KOH solution at a scan rate of 20 mV s-1. The inset shows the cyclic voltammograms of the Cu foam substrate and the CuO nanowires on the Cu foam electrode with the same geometrical area of 1 cm2[91]. Reproduced from Ref.[91] with permission from Elsevier.