Visualizing the Zero-Potential Line of Bipolar Electrodes with Arbitrary Geometry

Analytical Chemistry
Meng LiWei Wang

Abstract

In a typical bipolar electrochemistry (BPE) configuration, voltage applied between the two driving electrodes induced a potential drop through solution filled in the microchannel, resulting in an interfacial potential difference between solution and BPE varied along the BPE. In the present work, we employed a recently developed plasmonic imaging technique to map the distribution of surface potential of bipolar electrodes with various geometries including round, triangle, hexagon, star, and rhombus shapes under the nonfaradaic charging process, from which the line of zero potential (LZP) was visualized and determined. We further investigated the dependence of LZP on electrode geometry and the distribution of external electric field and explained the experimental results with a charge balance mechanism. The triangular and star-shaped BPEs show quite different LZP features from the other ones with symmetrical geometry. These experimentally obtained potential distributions are all in good agreement with electromagnetic simulations. Finally, the line of zero overpotential (LZO) of the triangular-shaped BPE under faradaic reactions were investigated. The results confirm the shift of LZO when faradaic reactions occurred at the corresp...Continue Reading

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Citations

May 3, 2019·Physical Chemistry Chemical Physics : PCCP·Alonso Gamero-QuijanoMicheál D Scanlon
Nov 25, 2020·Analytical Chemistry·Kira L Rahn, Robbyn K Anand

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