Potential modulation and control of redox reactions at bipolar electrodes using an ion-selective membrane

Document Type

Article

Publication Date

1-1-2024

Abstract

Potential difference at a bipolar electrode (BPE)/solution interface was controlled by forming a polymeric Na ion-selective membrane (ISM) on one part of the BPE. Using the difference between the potentials at the solution/cathodic pole and solution/anodic pole interfaces along with a predetermined driving voltage, the potential differences at the cathodic/anodic pole interface were independently regulated. For open bipolar systems, distinct changes in the intensity of electrochemiluminescence (ECL) were observed by varying the location of the ISM and/or the concentrations of the primary ions determining the potential of the ISM. Folded BPE structures with ISMs at one or both ends of the BPEs were more effective in changing the potential differences at the cathodic/anodic pole interface over a wider range. Furthermore, the potential control was efficient and changes in the ECL intensity were more significant in closed bipolar systems. The device was used for measuring analyte concentration by optimizing the size of the cathodic pole employed for detection and adjusting the driving voltage. We believe that the technique can be a starting point to achieve bipolar electrochemical devices with better controllabilities than those of previous bipolar electrochemical systems and similar reliabilities as those of three-electrode systems. © 2024 The Electrochemical Society (“ECS”). Published on behalf of ECS by IOP Publishing Limited.

Keywords

Ion selective electrodes, Poles, Redox reactions, Bipolar electrodes, Driving voltages, Electro chemiluminescence, Electrode structure, Electrode/solution interfaces, Ion-selective membrane, Na+ ions, One parts, Potential difference, Primary ions, Ions

Divisions

biomedengine

Funders

Japan Society for the Promotion of Science

Publication Title

Journal of the Electrochemical Society

Volume

171

Issue

2

Publisher

Institute of Physics

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