Engineering of the Charged Defects at the Perovskite Oxide Surfaces for Exceptionally Stable Solid Oxide Fuel Cell ElectrodesEngineering of Charged Defects at Perovskite Oxide Surfaces for Exceptionally Stable Solid Oxide Fuel Cell Electrodes
- Other Titles
- Engineering of Charged Defects at Perovskite Oxide Surfaces for Exceptionally Stable Solid Oxide Fuel Cell Electrodes
- Authors
- Choi, Mingi; Ibrahim, Ismail A. M.; Kim, Kyeounghak; Koo, Ja Yang; Kim, Seo Ju; Son, Ji-Won; Han, Jeong Woo; Lee, Wonyoung
- Issue Date
- May-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Solid oxide fuel cell; Perovskite oxide; Stability; Cation segregation; Charged defects; Heterointerface; Redistribution; Electron transfer
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.12, no.19, pp.21494 - 21504
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 12
- Number
- 19
- Start Page
- 21494
- End Page
- 21504
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/187344
- DOI
- 10.1021/acsami.9b21919
- ISSN
- 1944-8244
- Abstract
- Cation segregation, particularly Sr segregation, toward a perovskite surface has a significant effect on the performance degradation of a solid oxide cell (solid oxide electrolysis/fuel cell). Among the number of key reasons generating the instability of perovskite oxide, surface-accumulated positively charged defects (oxygen vacancy, V-o(center dot center dot)) have been considered as the most crucial drivers in strongly attracting negatively charged defects (SrA - site') toward the surface. Herein, we demonstrate the effects of a heterointerface on the redistribution of both positively and negatively charged defects for a reduction of V-o(center dot center dot) at a perovskite surface. We took Sm0.5Sr0.5CoO3-delta (SSC) as a model perovskite film and coated Gd0.1Ce0.9O2-delta (GDC) additionally onto the SSC film to create a heterointerface (GDC/SSC), resulting in an similar to 11-fold reduction in a degradation rate of similar to 8% at 650 degrees C and similar to 10-fold higher surface exchange (k(q)) than a bare SSC film after 150 h at 650 degrees C. Using X-ray photoelectron spectroscopy and electron energy loss spectroscopy, we revealed a decrease in positively charged defects of V-o(center dot center dot) and transferred electrons in an SSC film at the GDC/SSC heterointerface, resulting in a suppression of negatively charged Sr (Sr-Sm') segregation. Finally, the energetic behavior, including the charge transfer phenomenon, O p-band center, and oxygen vacancy formation energy calculated using the density functional theory, verified the effects of the heterointerface on the redistribution of the charged defects, resulting in a remarkable impact on the stability of perovskite oxide at elevated temperatures.
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