Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Improvement of Open Circuit Voltage (OCV) depending on Thickness of GDC Electrolyte of LT-SOFCs

저온형 SOFC용 GDC 전해질 두께에 따른 Open Circuit Voltage 향상

  • Ko, Hyun-Jun (Department of Advanced Materials Science and Engineering, Yonsei University) ;
  • Lee, Jong-Jin (Department of Advanced Materials Science and Engineering, Yonsei University) ;
  • Hyun, Sang-Hoon (Department of Advanced Materials Science and Engineering, Yonsei University)
  • 고현준 (연세대학교 신소재공학과) ;
  • 이종진 (연세대학교 신소재공학과) ;
  • 현상훈 (연세대학교 신소재공학과)
  • Published : 2010.03.31
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Abstract

It has been considered to apply GDC ($Gd_{0.1}Ce_{0.9}O_{1-X}$) for low-temperature SOFC electrolytes because it has higher ionic conductivity than YSZ at low temperature. However, open circuit voltage with using GDC ($Gd_{0.1}Ce_{0.9}O_{1-X}$) electrolyte in SOFCs, becomes lower than using YSZ (8 mol% Yttria stabilized Zirconia) electrolyte because GDC has electronic conductivity. In this work, the effect of changing GDC electrolyte thickness on the open circuit voltage has been investigated. Ni-GDC anode-supported unit cells were fabricated as follows. Mixed NiO-GDC powders were pressed and pre-sintered at $1200^{\circ}C$. And then, GDC electrolyte material was dip-coated on the anode and sintered at $1400^{\circ}C$. Finally the LSCF-GDC cathode material was screen-printed on the electrolyte and sintered at $1000^{\circ}C$. Electrolyte thickness was controlled by the number of dip-coating times. Open circuit voltage was measured depending on electrolyte thickness at $650^{\circ}C$ and found that the thicker GDC electrolyte was, the better OCV was.

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References

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