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J. Korean Ceram. Soc. > Volume 47(2); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(2): 195.
doi: https://doi.org/10.4191/kcers.2010.47.2.195
저온형 SOFC용 GDC 전해질 두께에 따른 Open Circuit Voltage 향상
고현준, 이종진, 현상훈
연세대학교 신소재공학과
Improvement of Open Circuit Voltage (OCV) depending on Thickness of GDC Electrolyte of LT-SOFCs
Hyun-Jun Ko, Jong-Jin Lee, Sang-Hoon Hyun
Department of Advanced Materials Science and Engineering, Yonsei University
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.
Key words: Solid oxide fuel cell, Open circuit voltage, Electrolyte, Gadolinia-doped ceria
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