New & Renewable Energy (신재생에너지)

Korean Society for New and Renewable Energy (한국신·재생에너지학회)
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Application of Layered Perovskites Substituted with Co and Ti as Electrodes in SOFCs

Co 및 Ti가 치환된 Layered perovskite의 SOFC 전극에 대한 적용성 연구

  • Kim, Chan Gyu (Department of Advanced materials Science and Engineering, Hanbat National University) ;
  • Shin, Tae Ho (Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Nam, Jung Hyun (Department of Polymer Science and Engineering, Sungkyunkwan University) ;
  • Kim, Jung Hyun (Department of Advanced materials Science and Engineering, Hanbat National University)
  • Received : 2022.02.28
  • Accepted : 2022.03.25
  • Published : 2022.06.25
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Abstract

In this study, the phase and electrochemical properties of Co and Ti substituted layered perovskites SmBaCo2-xTixO5+d (x=0.5, 0.7, 1.0, 1.1, 1.3, and 1.5) were analyzed, and their application as electrodes in solid oxide fuel cells (SOFCs) were evaluated. After calcination at 1300℃ for 6 h, a single phase was observed for two compositions of the SmBaCo2-xTixO5+d oxide system, SmBaCoTiO5+d (x=1.0) and SmBaCo0.9Ti1.1O5+d (x=1.1). However, the phases of SmBaCoTiO5+d (SBCTO) and SmTiO3 coexisted for compositions with x≥1.3 (Ti content). In contrast, for compositions of x≤0.7, the SmBaCo2O5+d phase was observed instead of the SmTiO3 phase. To evaluate the applicability of these materials as SOFC electrodes, the electrical conductivities were measured under various atmospheres (air, N2, and H2). SBCTO exhibited stable semi-conductor electrical conductivity behavior in an air and N2 atmosphere. However, SBCTO showed insulator behavior at temperatures above 600℃ in a H2 atmosphere. Therefore, SBCTO may only be used as cathode materials. Moreover, SBCTO had an area specific resistance (ASR) value of 0.140 Ω·cm2 at 750℃.

Keywords

Acknowledgement

본 연구는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원(No. 2019R1A2C1087534)과 한국세라믹기술원의 기관고유사업(KPP20003/21010)의 지원을 받아 수행된 연구 결과입니다. 이에 감사드립니다.

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