INFLUENCE OF THE SUPPORTING ELECTROLYTE AND THE PH ON THE ELECTROOXIDATIVE ACTIVATION OF GLASSY-CARBON ELECTRODES

被引:23
作者
JURGEN, D
STECKHAN, E
机构
[1] Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, W-5300 Bonn 1
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1992年 / 333卷 / 1-2期
关键词
D O I
10.1016/0022-0728(92)80390-P
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Glassy carbon electrodes were modified by electrooxidative pretreatment in sulphate, phosphate. perchlorate and tetrafluoroborate solutions applying a constant potential (1600 mV vs. Ag/AgCl) for 1 h. In addition, the pH of the sulphate and phosphate solutions was altered, and two cations (Li+ and Na+) were used as counterions of tetrafluoroborate. The effect of the different supporting electrolytes and the pH during electrochemical pretreatment on the formation of graphite oxide on the glassy carbon surfaces was investigated. All anodizations resulted in higher background currents, increased reversibility of the catechol couple, and decreased values of the anodic peak potentials of catechol and ascorbic acid. The anodic peak heights of catechol were dependent on the anion and the pH chosen for the anodization, and the anodic peak heights of ascorbic acid seemed to be specific for the anion chosen as the supporting electrolyte. Most of the modified electrodes showed coloured surface layers and increased wettability. The biggest influence on the anodization had LiClO4 as supporting electrolyte. The change of the cation from Na+ to Li+ as the counterion of BF4- had almost no effect on the results of the electrochemical pretreatment.
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页码:177 / 193
页数:17
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