Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 123, Issue 36, Pages 21993-21997Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b05705
Keywords
-
Funding
- Russian Science Foundation [18-73-00001]
- Russian Science Foundation [18-73-00001] Funding Source: Russian Science Foundation
Ask authors/readers for more resources
Features of ionic transport across grains and along grain boundaries of solid oxide electrolyte materials play a key role in the efficient application of these materials in electrochemical devices including solid oxide fuel and electrolysis cells, membrane reactors, and electrochemical converters. In the present work, equivalent circuit scheme (ECS) and distribution of relaxation times (DRT) analyses were successfully utilized to distinguish the bulk and grain boundary resistances, both from each other and from the polarization resistance component. Considering a Ag|BCG|Ag symmetrical cell (where BCG = BaCe0.9Gd0.1O3-delta) as a simple model system, the complex impedance spectra were obtained. Due to the close characteristic parameters (relaxation time and capacitance) exhibited by some electrochemical processes, these spectra cannot be precisely resolved using only an ECS tool, although a joint application of ECS and DRT allowed the spectra to be deconvoluted. As a result, data concerning grain and grain boundary conductivities were obtained along with their activation energies. The good agreement of these data with those published in the literature indicates the correctness of the provided analysis. The presented results confirm the wide applicability of ECS/DRT for various electrochemical functions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available