caa a22 4500 463220455 CHVBK 20180405153210.0 cr unu---uuuuu 170326e20070201xx s 000 0 eng 10.1134/S1061934807020116 doi (NATIONALLICENCE)springer-10.1134/S1061934807020116 Voltammetric studies of the activity of an electrode made of a graphite-epoxy composite in redox reactions of ascorbic acid and hydroquinone [Elektronische Daten] [V. Kiryushov, L. Skvortsova, T. Aleksandrova] The potentials of the anodic peak of ascorbic acid oxidation and the potential differences of anodic and cathodic peaks (ΔE p) of the hydroquinone/benzoquinone redox system at an electrode made of a graphite-epoxy composite are determined in weakly acidic and neutral supporting electrolytes by direct and cyclic voltammetry. The results obtained are compared with thermodynamic values and with the available values of these parameters at different solid electrodes for the above-mentioned redox systems. The effect of aging of the surface of electrodes made of graphite-epoxy composites on the potentials and peak currents of the anodic oxidation of ascorbic acid are studied. It is demonstrated that the regeneration of the electrode surface by mechanically cutting thin layers is important for reducing the δE p value of the hydroquinone/benzoquinone redox system down to 28-30 mV in supporting electrolytes with pH 2.0 and 7.0. This value is typical of thermodynamically reversible electrode reactions involving two-electron transfer at 20-25°C. Pleiades Publishing, Ltd., 2007 Kiryushov V. Institute of Solid-State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, ul. Kutateladze 18, 630128, Novosibirsk, Russia aut Skvortsova L. Institute of Solid-State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, ul. Kutateladze 18, 630128, Novosibirsk, Russia aut Aleksandrova T. Institute of Solid-State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, ul. Kutateladze 18, 630128, Novosibirsk, Russia aut Journal of Analytical Chemistry Nauka/Interperiodica 62/2(2007-02-01), 161-167 1061-9348 62:2<161 2007 62 10809 https://doi.org/10.1134/S1061934807020116 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061934807020116 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kiryushov V. Institute of Solid-State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, ul. Kutateladze 18, 630128, Novosibirsk, Russia aut NATIONALLICENCE 700 1- Skvortsova L. Institute of Solid-State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, ul. Kutateladze 18, 630128, Novosibirsk, Russia aut NATIONALLICENCE 700 1- Aleksandrova T. Institute of Solid-State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, ul. Kutateladze 18, 630128, Novosibirsk, Russia aut NATIONALLICENCE 773 0- Journal of Analytical Chemistry Nauka/Interperiodica 62/2(2007-02-01), 161-167 1061-9348 62:2<161 2007 62 10809 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer