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Every paper I've seen discussing it uses it with carbon nanofiber or some other carbon material like a diamond. If the physical principles by which it works are based on sweeping through voltages, I don't understand why it can't be used with metal electrodes.

I've tried to search through the literature but I haven't come across any clear answers.

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It actually does work. Carbon fiber electrodes are just more useful for the neuro work that fast scans are popular for these days.

Here is an example from the literature of a metal electrode used up to $3*10^6$ V/s , Amatore et. al. JEAC

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