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First of all, a theoritical peak separation of 0mV is expected for a fast and reversible surface-confined process (see Bard and Faulkner). A peak separation of 60 mV would suggest a diffusion controlled process. However, a linear current dependance towards scan rate is indicative of a surface -controlled process.
A peak-to-peak separation of 60 mV for a surface-confined process is high as compared to the theoretical 0 mV. The electron transfer can therefore not be considered as "rapid and reversible". Could the authors modify the discussion?

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