Potentiometric Sensors for High Temperature Liquids

Fouletier, J.; Ghetta, V.

doi:10.1007/978-1-4020-8422-5_22

Cited by 1 publication

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“…41 Electrical conduction of the electrolyte by only one ion and negligible electronic conductivity (far lower than 1%), equilibrium at both reference and working electrodes and chemical stability of the solid electrolyte are required as potentiometric cell. 42 For the use of GDC in low temperature (450-520 K) liquid sodium environment, electrolyte domain should be defined at the oxygen partial pressure between 10 −73 and 10 −80 atm, however, limited ranges of the electrolyte domain of GDC were researched. 43 In this study, GDC solid electrolyte shows n-type electronic properties in oxygen-saturated sodium environment since cerium displays a stable 4+-oxidation state and it can be shown by simple thermodynamic arguments that reduction of Ce 4+ to Ce 3+ is possible using liquid sodium.…”

Section: Table II Results Of the Energy Dispersive Spectroscopy (Eds)...mentioning

confidence: 99%

Measurement of Emf in Liquid Sodium Using a Gadolinia-Doped Ceria Solid Electrolyte

Shin

Lee

et al. 2015

J. Electrochem. Soc.

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Improvement in the efficiency of solid electrolytes requires the use of low electrolyte operating temperatures even though the ionic conductivity of electrolytes generally decreases at low temperatures. In this study, we propose the use of gadolinia-doped ceria (GDC) that has relatively high conductivity even at low temperature (200 • C) as a solid electrolyte for potential application in liquid sodium, and we investigate its thermochemical stability in the liquid sodium environment. The results of microstructural analyses, thermochemical stability tests, and total conductivity measurements in liquid sodium at 200 • C are discussed. Potentiometric cell with gadolinia-doped ceria (GDC) as a solid electrolyte and a In/In 2 O 3 reference electrode were also tested in oxygen saturated liquid sodium environment in order to measure the emf. The emf in sodium environment is compared with theoretical data. The emf values measured in this study show a narrow range at low temperatures; however, the emf rapidly decreases with increasing temperature. The reason is caused by the mixed ionic electronic conductivity of GDC in oxygen-saturated sodium environment.

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Section: Table II Results Of the Energy Dispersive Spectroscopy (Eds)...mentioning

confidence: 99%