Document Type
Article
Publication Date
5-18-2020
Abstract
The Ag/AgCl reference electrode is commonly used in choline chloride based deep eutectic solvents. However, we found it undergoes significant potential shifts in electrochemical tests which previous reports largely ignored. In this work, we studied the degradation mechanism leading to its instability. Results show that due to the high Cl− concentration in ethaline, the AgCl film easily dissolves and forms AgCl2 − species causing a potential shift. Therefore, we suggest a [Fe(CN)6]3−/[Fe(CN)6]4− reference electrode based on the reversibility and low diffusivity of [Fe(CN)6]3−/[Fe(CN)6]4− redox couple in ethaline, which was demonstrated to be reliable and stable over weeks of operation.
Keywords
solvents, electrodes
Publication Title
Journal of The Electrochemical Society
Rights
© 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BYNC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org.
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Recommended Citation
X. Shen et al 2020. Evaluating and Developing a Reliable Reference Electrode for Choline Chloride Based Deep Eutectic Solvents. J. Electrochem. Soc. 167 086509. DOI 10.1149/1945-7111/ab913c