A linear diffusion model for ion current across blocking grain boundaries in oxygen-ion and proton conductors

Seong K. Kim, Sergey Khodorov, Igor Lubomirsky, Sangtae Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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 ∝ Ugb n, 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.

Original languageEnglish
Pages (from-to)14961-14968
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number28
DOIs
Publication statusPublished - Jul 28 2014

Fingerprint

oxygen ions
ion currents
Protons
Grain boundaries
grain boundaries
conductors
Ions
Oxygen
protons
Cerium compounds
Solid electrolytes
solid electrolytes
Barium zirconate
Charge carriers
Temperature
barium
temperature
charge carriers
Electric potential
electric potential

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

A linear diffusion model for ion current across blocking grain boundaries in oxygen-ion and proton conductors. / Kim, Seong K.; Khodorov, Sergey; Lubomirsky, Igor; Kim, Sangtae.

In: Physical Chemistry Chemical Physics, Vol. 16, No. 28, 28.07.2014, p. 14961-14968.

Research output: Contribution to journalArticle

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