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Self-Transforming Configuration Based on Atmospheric-Adaptive Materials for Solid Oxide Cellsopen access

Authors
Kim, SeonaLee, SeungtaeKim, JunyoungShin, JeeyoungKim, Guntae
Issue Date
Nov-2018
Publisher
Nature Publishing Group
Citation
Scientific Reports, v.8, no.1, pp 1 - 7
Pages
7
Journal Title
Scientific Reports
Volume
8
Number
1
Start Page
1
End Page
7
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/4185
DOI
10.1038/s41598-018-35659-y
ISSN
2045-2322
Abstract
Solid oxide cells (SOC) with a symmetrical configuration have been focused due to the practical benefits of such configurations, such as minimized compatibility issues, a simple fabrication process and reduced cost compared to SOCs with the asymmetrical configuration. However, the performance of SOCs using a single type of electrode material (symmetrical configuration) is lower than the performance of those using the dissimilar electrode materials (asymmetrical configuration). Therefore, to achieve a high-performance cell, we design a ‘self-transforming cell’ with the asymmetric configuration using only materials of the single type, one based on atmospheric adaptive materials. Atmospheric-adaptive perovskite Pr0.5Ba0.5Mn0.85Co0.15O3-δ (PBMCo) was used for the so-called self-transforming cell electrodes, which changed to layered perovskite and metal in the fuel atmosphere and retained its original structure in the air atmosphere. In fuel cell mods, the self-transforming cell shows excellent electrochemical performance of 1.10 W cm−2 at 800 °C and good stability for 100 h without any catalyst. In electrolysis mode, the moderate current densities of −0.42 A cm−2 for 3 vol.% H2O and −0.62 A cm−2 for 10 vol.% H2O, respectively, were observed at a cell voltage of 1.3 V at 800 °C. In the reversible cycling test, the transforming cell maintains the constant voltages for 30 h at +/− 0.2 A cm−2 under 10 vol. % H2O. © 2018, The Author(s).
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