Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Structural and electrochemical characterization of K2NiF4 type layered perovskite as cathode for SOFCs

K2NiF4 type 층상 페롭스카이트 구조 La(Ca)2Ni(Cu)O4-δ의 SOFC 양극 특성 및 결정구조 평가

  • Myung, Jae-ha (Department of Materials Science and Engineering, Yonsei University) ;
  • Hong, Youn-Woo (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Lee, Mi Jai (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Jeon, Dae-Woo (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Lee, Young-Jin (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Hwang, Jonghee (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Shin, Tae Ho (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Paik, Jong Hoo (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering & Technology (KICET))
  • 명재하 (연세대학교, 신소재공학과) ;
  • 홍연우 (한국세라믹기술원, 전자소재융합본부) ;
  • 이미재 (한국세라믹기술원, 전자소재융합본부) ;
  • 전대우 (한국세라믹기술원, 전자소재융합본부) ;
  • 이영진 (한국세라믹기술원, 전자소재융합본부) ;
  • 황종희 (한국세라믹기술원, 전자소재융합본부) ;
  • 신태호 (한국세라믹기술원, 전자소재융합본부) ;
  • 백종후 (한국세라믹기술원, 전자소재융합본부)
  • Received : 2015.06.04
  • Accepted : 2015.06.12
  • Published : 2015.06.30
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Abstract

$La_2NiO_{4+{\delta}}$ based oxides, a mixed electronic-ionic conductors (MIECs) with $K_2NiF_4$ type structure, have been considerably investigated in recent decades as electrode materials for advanced solid oxide fuel cells (SOFCs) due to their high electrical conductivity, and oxidation reduction reaction (ORR). In this study, structure properties of $La(Ca)_2Ni(Cu)O_{4+{\delta}}$ were studied as a potential cathode for intermediate temperature SOFCs (IT-SOFCs).

혼합이온 전도체인 $K_2NiF_4$-type 산화물인 $La(Ca)_2Ni(Cu)O_{4+{\delta}}$ 분말을 합성하여 결정구조 분석과 분말의 나노구조화에 따른 고체산화물 연료전지의 양극 성능을 비교 평가하였다. 이온 반경이 큰 Cu가 Ni 자리에 치환되어 Ni-O 팔면체 구조에서 c 축 방향으로 결정구조가 팽창하였으며, Ni-Cu의 Jahn-Teller 뒤틀림으로 산소이온 산화 환원 반응과 이온 전도도 특성에 영향을 주었다. 특히 나노구조의 $La(Ca)_2Ni(Cu)O_{4+{\delta}}$ 분말의 경우 표면 촉매성능이 향상되어 단위 전지 성능 향상 결과를 얻을 수 있었다. Ni-YSZ 음극 지지체에 8YSZ 전해질을 dip-coating한 후 $La(Ca)_2Ni(Cu)O_{4+{\delta}}$ 분말을 양극으로 도포하여 얻은 SOFC 단위성능 측정 결과 $800^{\circ}C$에서 $1w/cm^2$의 최대 출력 값을 얻을 수 있었다.

Keywords

References

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