Abstract
Electropolymerization of o-aminophenol at planar glassy carbon and ultraporous carbon nanofoam electrodes in buffered aqueous electrolytes produces an ultrathin coating of poly(o- aminophenol), POAP. Poly(o-aminophenol) is not electroactive at the deposition pH of 4.7, and thus the electrodeposited POAP film rapidly passivates the electrode surface against further monomer oxidation. The self-limiting nature of the deposition process allows ultrathin coatings to be deposited onto and within ultraporous electrode structures without occluding the through-connected pore network of the nanofoam. When transferred to acidic aqueous electrolytes, POAP protonates and becomes electroactive. The charge-storage capacity for the resulting composite POAP-coated carbon is higher than that for bare carbon because of the added faradaic electrochemical reactions from the polymer coating.
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