TY - JOUR
T1 - Measurement of Emf in Liquid Sodium Using a Gadolinia-Doped Ceria Solid Electrolyte
AU - Lim, Jun
N1 - Score=10
PY - 2015/4/1
Y1 - 2015/4/1
N2 - 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/In2O3 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.
AB - 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/In2O3 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.
KW - EMF
KW - gadolinia doped ceria
KW - Liquid sodium
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/11932185
U2 - 10.1149/2.0301507jes
DO - 10.1149/2.0301507jes
M3 - Article
SN - 0013-4651
VL - 162
SP - B152-B158
JO - Journal of The Electrochemical Society
JF - Journal of The Electrochemical Society
IS - 7
ER -