Han Wang and Siambun, Nancy J. and Wang, Linpo Yu and Chen, George Z. (2012) A Robust Alumina Membrane Reference Electrode for High Temperature Molten Salts. Journal of The Electrochemcial Society, 159.
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Abstract
A new reference electrode for high temperature molten salts (except for fluorides) was conveniently fabricated by sealing the Ag|Ag+ (AgCl) couple in a commercial alumina tube whose closed end was ground into a membrane (ca. 0.1 mm in thickness) to facilitate ion conduction. Repeated (>15 times) and prolonged continuous (7 days) tests of this reference electrode in molten chloride and carbonate salts confirmed highly satisfactory and robust performance in terms of stability, reproducibility and reusability over a wide range of temperatures (500∼900°C) without any noticeable deterioration. It exhibited ionic resistance (<4 kΩ) decreasing with temperature, but changing insignificantly with the composition of all molten salts tested. A linear relation of potential versus logarithm of mole fraction of NaCl was observed in mixed NaCl-CaCl2 (slope: 0.1603 V/decade). Salt penetration into the membrane was confirmed by scanning electron microscopy, although no through-pores were observed. These findings are discussed in terms of the membrane and liquid junction potentials, and a mechanism of ion conduction through semi-closed pores (fast and ion-non-selective) and grain boundaries (slow and cation-selective) in series.
| Item Type: | Article |
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| Keyword: | Physical and Analytical Electrochemistry, Electrocatalysis, and Photoelectrochemistry |
| Subjects: | Q Science > QD Chemistry T Technology > T Technology (General) |
| Department: | FACULTY > Faculty of Engineering |
| Depositing User: | OTHMAN HJ RAWI - |
| Date Deposited: | 05 Mar 2019 12:07 |
| Last Modified: | 05 Mar 2019 12:07 |
| URI: | https://eprints.ums.edu.my/id/eprint/21425 |
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