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1. Similarly, it is no correct to affirm that the process is a diffusion-controlled one only because the peak current grows in a linear fashion with square root of the scan rate.
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2.Finally, the origin of non-zero intercepts on the current potential scan rate (square root) is unclear and against fundamental electrochemical relathionships (Randles Sevcik equation). this does require clarification and correction? has the background not (or incoreectly) subtracted?
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Moreover, the shapes of the CV curves are similar as the scan rates increase from 5 mV s−1 to 40 mV s−1, showing anodic and cathodic peaks and indicating that a fast redox reaction occurred at the interface of the electroactive materials and the electrolyte. With increase in the scan rate, the measured specific current increases and the anodic and cathodic peaks shift positively and negatively, respectively. This is due to the diffusion extent of OH− into the XXX matrix at various scan rates. Besides, the anodic current (Ip) increase linearly with the square root of the scan rate (v1/2) at all scan rates (Fig. 6b), indicating the redox reaction of XXX in KOH solution is a diffusion-controlled process.

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