Analytical Sciences

Conducting Polymer-coated Electrode as a Reference/Counter Electrode in an Organic Phase and Its Application to a Two-electrode Type Thin-layer Cell for Voltammetry at the Liquid | Liquid Interface

Yumi YOSHIDA,*,** Satoshi YAMAGUCHI,* and Kohji MAEDA*

*Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo, Kyoto 606-8585, Japan
**PRESTO, Japan Science and Technology Agency, Sanbancho bldg., 5-Sanbancho, Chiyoda, Tokyo 102-0075, Japan

An indium tin oxide glass electrode coated with poly(3,4-ethylenedioxythiophene), PEDOT, PEDOT-ITOE, was proposed as an electrode workable as both a reference electrode and a counter one, a reference/counter electrode, in an organic phase and applied to a thin-layer cell of a two-electrode system for voltammetry at the liquid | liquid interface. By oxidizing the PEDOT film by 50% and doping a supporting electrolyte anion in an organic phase into the PEDOT film, a suitable depolarization was realized at the PEDOT | organic phase interface. The partially oxidized PEDOT-ITOE showed a Nerntian response to the supporting electrolyte anion concentration in the organic phase. The electrode potential was stable within ±3 mV for 12 h, and showed a consistent value among the PEDOT-ITOEs prepared under the same procedure (the error range was about 7 mV, n = 8).

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