Voltammetric response and electrochemical properties of the O2/O
2
•−
couple in acetone |
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Authors: | Y Wei C Shao Hufeng |
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Institution: | (1) Zhengzhou University of Light Industry, Zhengzhou, 450002, P.R. China;(2) Laoyang University, P.R. China |
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Abstract: | Voltammetric responses of the O2/O
2
•−
couple as a function of aprotic solvents are investigated. The results show that acetone is a suitable solvent for examining
the electrode reaction of the O2/O
2
•−
couple. Studying the electrochemical behavior of the O2/O
2
•−
couple at different electrodes in acetone by cyclic voltammetry suggests that the reversibility of the O2/O
2
•−
couple and the redox peak currents at glassy carbon are better than those at gold and platinum. The kinetic parameters (electron
transfer rate constant k
0 and cathodic transfer coefficient α) of the oxygen reduction to superoxide ion (O
2
•−
) are evaluated using normal-pulse voltammetry. The obtained values of k
0 (cm/s) and α are (1.95 ± 0.05) × 10−4 and 0.34 ± 0.01, respectively. The scavenging activities of ascorbic acid and bilirubin are tested and the experimental results
confirm that ascorbic acid is a better scavenger toward O
2
•−
.
Published in Russian in Elektrokhimiya, 2007, Vol. 43, No. 2, pp. 188–194.
The text was submitted by the authors in English. |
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Keywords: | oxygen superoxide ion acetone scavenging activity |
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