TY - JOUR
T1 - A linear diffusion model for ion current across blocking grain boundaries in oxygen-ion and proton conductors
AU - Kim, Seong K.
AU - Khodorov, Sergey
AU - Lubomirsky, Igor
AU - Kim, Sangtae
AU - Kim, So Hui
N1 - US-Israel Binational Science Foundation; Minerva foundation S.K. and I.L. wish to thank the US-Israel Binational Science Foundation and Minerva foundation for funding this research. I.L. wishes to acknowledge the Nancy and Stephen Grand Research Center for Sensors and Security. The research is also made possible in part by the generosity of the Harold Perlman Family.
PY - 2014/7/28
Y1 - 2014/7/28
N2 - We demonstrate the applicability of the linear diffusion model recently proposed for the current-voltage, Igb-Ugb, characteristics of blocking grain boundaries in solid electrolytes to various oxygen-ion and proton conductors: the model precisely reproduces the Igb-U gb characteristics of La-, Sm-, Gd-, and Y-doped ceria as well as Y-doped barium zirconate to provide accurate explanations to the "power law" behavior of the Igb-Ugb relationship, i.e. Igb ∝ Ugbn, experimentally observed. The model also predicts that the grain-boundary potential, Ψgb, in doped ceria weakly depends on temperature, if the trapped charge remains constant, and that the value of Ψgb can be determined from the value of the power n. Furthermore, the model provides a plausible explanation for the increase in the Ψgb with temperature observed for the proton conductor in which the concentration of the charge carrier decreases with temperature. Hence, it is evident that the linear diffusion model is robust and applicable to grain boundaries in a large variety of practically important solid electrolytes.
AB - We demonstrate the applicability of the linear diffusion model recently proposed for the current-voltage, Igb-Ugb, characteristics of blocking grain boundaries in solid electrolytes to various oxygen-ion and proton conductors: the model precisely reproduces the Igb-U gb characteristics of La-, Sm-, Gd-, and Y-doped ceria as well as Y-doped barium zirconate to provide accurate explanations to the "power law" behavior of the Igb-Ugb relationship, i.e. Igb ∝ Ugbn, experimentally observed. The model also predicts that the grain-boundary potential, Ψgb, in doped ceria weakly depends on temperature, if the trapped charge remains constant, and that the value of Ψgb can be determined from the value of the power n. Furthermore, the model provides a plausible explanation for the increase in the Ψgb with temperature observed for the proton conductor in which the concentration of the charge carrier decreases with temperature. Hence, it is evident that the linear diffusion model is robust and applicable to grain boundaries in a large variety of practically important solid electrolytes.
UR - http://www.scopus.com/inward/record.url?scp=84903527350&partnerID=8YFLogxK
U2 - https://doi.org/10.1039/c4cp01254b
DO - https://doi.org/10.1039/c4cp01254b
M3 - مقالة
SN - 1463-9076
VL - 16
SP - 14961
EP - 14968
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 28
ER -