Because, I am getting negative intercept for my dopamine sensor (diffusion controlled process). When i am plotting the peak current vs square root of scan rate, i am getting negative intercept. But when i plot with scan rate it shows positive intercept. So, what is reason behind this, and what the intercept stands for......
diffusion controlled process or adsorption controlled process was closely related to i plot with square root of scan rate or scan rate, but not related to negative or positive intercept (I did not see related reports).
Plz read my article (http://www.sciencedirect.com/science/article/pii/S1572665716302806)
Generally, a process that is completely diffusion controlled shows the intercept at 0. However, sometimes the process is diffusion controlled but it is not the only process occurring on the electrode surface. You can also have a look of one of my articles where the same phenomenon occurred to me:
Article Electrochemical Study of a Simulated Spent Pickling Solution
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