Effects of 8 mol% yttria-stabilized zirconia with copper oxide on solid oxide fuel cell performance

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 

  1. Department of Chemical and Bio-molecular Engineering, Yonsei University, 134 Shinchon-dong Seodaemun-gu, Seoul 120-749, Republic of Korea.
  2. LTC Co., Ltd., Seoul 120-749, Anyang, Gyeonggi, Republic of Korea
  3. Department of Advanced Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-ku, Seoul 120-749, Republic of Korea.

 

Abstract

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.

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