Nearly reversible polarographic waves of ferrocenecarboxylate at dropping carbon fluid electrodes

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• 作者：Hirosuke Tatsumi ; ^{tatsumi@shinshu-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Nariaki Seike ; Kei Kubo
• 关键词：Polarography ; Dropping electrodes ; Carbon fluid electrodes ; Potential of zero charge
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2016
• 出版时间：15 October 2016
• 年：2016
• 卷：779
• 期：Complete
• 页码：236-240
• 全文大小：638 K

文摘

A new polarography was studied with dropping carbon fluid electrode (DCFE), composed of graphite powder and low-viscosity liquid paraffin. By using a stainless steel capillary with 0.37 mm inner diameter and a very dense electrolyte solution of saturated CsCl (~ 10 M), nearly spherical carbon drops of about 2 mm at the maximum size were obtained reproducibly. Well-defined polarograms of ferrocenecarboxylate (FcCOO⁻) with clear limiting currents were observed at this dropping electrode. The slope of the log plot of the polarogram was 66.6 mV, which was close to the theoretical value of reversible wave (59.2 mV at 25 °C). By achieving the nearly reversible polarographic wave, limiting currents could be observed more clearly than our previous study, in which broadened polarograms had been obtained due to a considerable IR drop at high concentrations. Potential of zero charge of DCFE was also measured and discussed.