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J. Korean Ceram. Soc. > Volume 59(2); 2022 > Article
Journal of the Korean Ceramic Society 2022;59(2): 131-152.
doi: https://doi.org/10.1007/s43207-021-00175-9
A brief review of heterostructure electrolytes for high-performance solid oxide fuel cells at reduced temperatures
Doyeub Kim1, Incheol Jeong1,2, Kyeong Joon Kim1, Kyung Taek Bae1, Dongyeon Kim1, Jongun Koo1, Hyeongmin Yu1, Kang Taek Lee1
1Department of Mechanical Engineering, KAIST, Daejeon 34141, Korea
2Department of Energy Science and Engineering , DGIST , Daegu   42988 , Korea
Correspondence  Kang Taek Lee ,Email: leekt@kaist.ac.kr
Received: August 30, 2021; Revised: November 12, 2021   Accepted: December 6, 1949.  Published online: March 31, 2022.
Solid oxide fuel cells (SOFCs), which are widely viewed as the next-generation energy conversion devices, provide environmentally friendly power generation by direct conversion of chemical energy with high efficiency and less pollutant emissions. However, their high operating temperatures limit their usability in applications, such as distributed generation of electricity and heat, power plants, and transportation. At reduced temperatures, the electrolytes and electrodes used in SOFCs experience sluggish oxygen transport kinetics. Therefore, the development of materials with high oxygen ion conduction and unique cell designs is needed to achieve higher performance. This article provides an overview of the recent progress on solid oxide electrolyte materials, unique cell designs featuring bilayer electrolytes, and resulting microstructures at lower operating temperatures.
Key words: Solid oxide fuel cells  · High-performance  · Heterostructures  · Bilayer  · Electrolytes
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