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Microchannel Voltammetry in the Presence of Large External Voltages and Electric Fields

Author:
Zaino, Lawrence P., Wichert, William R. A., Crouch, Garrison M., Bohn, Paul W.
Source:
Analytical chemistry 2016 v.88 no.8 pp. 4200-4204
ISSN:
1520-6882
Subject:
capillary electrophoresis, electric field, electric power, electrochemistry, electrodes, instrumentation, silver, silver chloride
Abstract:
The ability to perform electrochemistry in the presence of large voltages and electric field magnitudes without concern for the local potential has many possible applications in micro/nanofluidic assays and in capillary electrophoresis. Traditionally, electrochemistry in the presence of significant external electric fields has been dominated by end-channel detection for capillary and microchip electrophoresis detection. We describe novel instrumentation for potentiostatically controlled voltammetry that can be applied in the presence of high external voltages and electric fields. Cyclic voltammetry is demonstrated without significant shifts in the half-wave potential at working electrodes at local potentials of up to ∼1500 V and field strengths of up to 3000 V/cm, using a standard Ag/AgCl reference electrode.
Agid:
5304743