Nanoporous spongelike Au
By Wierzbicka, Ewa; Sulka, Grzegorz D.
Published in Journal of Electroanalytical Chemistry
NULL
2016
Abstract
Abstract A simple strategy to fabricate an efficient electrochemical sensor for epinephrine (EP) oxidation is developed by selective etching of the electrodeposited thin Au-Ag alloyed film. The electrochemical characterization of obtained nanoporous spongelike Au-Ag electrodes was carried out by cyclic voltammetry (CV) and chronoamperometry. It was found that the nanoporous Au-Ag electrode exhibits a significantly higher electrocatalytic activity toward {EP} oxidation when comparing with a bulk Au electrode. The performed electrochemical tests demonstrated that {EP} oxidation and reduction processes are controlled by diffusion. The transfer coefficient (? = 0.55) and total number of electrons involved in the anodic oxidation of epinephrine to adrenalinequinone (n = 2) as well as the diffusion coefficient of {EP} in the 0.1 M phosphate buffer solution {PBS} (D = 1.29
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