Pr- and Sm-Substituted Layered Perovskite Oxide Systems for IT-SOFC Cathodes

Sung Hun Woo, Kyeong Eun Song, Seung-Wook Baek, Hyunil Kang, Wonseok Choi, Tae Ho Shin, Jun-Young Park and Jung Hyun Kim
Additional contact information
Sung Hun Woo: Department of Advanced Materials Science and Engineering, Hanbat National University, 125, Dongseodae-ro, Yuseong-gu, Daejeon 34158, Korea
Kyeong Eun Song: Department of Advanced Materials Science and Engineering, Hanbat National University, 125, Dongseodae-ro, Yuseong-gu, Daejeon 34158, Korea
Seung-Wook Baek: Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science (KRISS), 267, Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
Hyunil Kang: Department of Electrical Engineering, Hanbat National University, 125, Dongseo-Daero, Yuseong-gu, Daejeon 34158, Korea
Wonseok Choi: Department of Electrical Engineering, Hanbat National University, 125, Dongseo-Daero, Yuseong-gu, Daejeon 34158, Korea
Tae Ho Shin: Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101, Soho-ro, Jinju-si 52851, Korea
Jun-Young Park: HMC, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 143-747, Korea
Jung Hyun Kim: Department of Advanced Materials Science and Engineering, Hanbat National University, 125, Dongseodae-ro, Yuseong-gu, Daejeon 34158, Korea

Energies, 2021, vol. 14, issue 20, 1-18

Abstract: In this study, the phase synthesis and electrochemical properties of A / A // A /// B 2 O 5+d (A / : Lanthanide, A // : Ba, and A // : Sr) layered perovskites in which Pr and Sm were substituted at the A/-site were investigated for cathode materials of Intermediate Temperature-Operating Solid Oxide Fuel cells (IT-SOFC). In the Pr x Sm 1−x Ba 0.5 Sr 0.5 Co 2 O 5+d (x = 0.1–0.9) systems, tetragonal (x < 0.4) and orthorhombic (x ≥ 0.5) crystalline structures were confirmed according to the substitution amount of Pr, which has a relatively large ionic radius, and Sm, which has a small ionic radius. All of the layered perovskite oxide systems utilized in this study presented typical metallic conductivity behavior, with decreasing electrical conductivity as temperature increased. In addition, Pr 0.5 Sm 0.5 Ba 0.5 Sr 0.5 Co 2 O 5+d (PSBSCO55), showing a tetragonal crystalline structure, had the lowest conductivity values. However, the Area-Specific Resistance (ASR) of PSBSCO55 was found to be 0.10 Ω cm 2 at 700 °C, which is lower than those of the other compositions.

Keywords: intermediate; temperature-operating; solid; oxide; fuel; cell; electrical conductivity; electrochemical properties; X-ray photoelectron spectroscopy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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