Ceramics International, Volume 41, Issue 6, July 2015, Pages 7982–7988.
Jin Goo Lee1,3, Ok Sung Jeon1,3, Kwang Hyun Ryu2,3, Myeong Geun Park1,3, Sung Hwan Min2,3,Sang Hoon Hyun3, Yong Gun Shul1,3
- Department of Chemical and Bio-molecular Engineering, Yonsei University, 134 Shinchon-dong Seodaemun-gu, Seoul 120-749, Republic of Korea.
- LTC Co., Ltd., Seoul 120-749, Anyang, Gyeonggi, Republic of Korea
- Department of Advanced Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-ku, Seoul 120-749, Republic of Korea.
Solid oxide fuel cells (SOFCs) have advanced rapidly for the last decades. Since 8 mol% yttria-stabilized zirconia (8YSZ) has been considered the most conventional material for SOFC electrolyte, a number of studies have been focused on improving 8YSZ performance by changing dopants or adding a trace of metal oxide. In this study, the effect of a trace of CuO (100 ppm) on the performance of 8YSZ-based SOFCs is investigated. It is found that addition of a trace of CuO not only promotes a densification of the YSZ electrolyte by acting as a sintering aid but also increases the amount of the oxygen vacancy in the YSZ electrolyte. The ionic conductivities are about 0.0173 S cm−1 and 0.0196 S cm−1 in pristine and CuO (100 ppm)–YSZ electrolyte, respectively. The cell performance is about 0.5103 W cm−2 at 800 °C, which is about 1.5 times higher than the cell based on the pure YSZ electrolyte. The gadolinium-doped ceria (GDC)/8YSZ bilayer cell test also shows similar improvement to the single YSZ cell tests. Thus, the introduction of a trace of Cu (100 ppm) to the 8YSZ can be promising for a solid oxide fuel cell electrolyte.