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Korean Journal of Metals and Materials > Volume 55(5); 2017 > Article
Korean Journal of Metals and Materials 2017;55(5): 335-341. doi: https://doi.org/10.3365/KJMM.2017.55.5.335
BCY 기반 고체산화물 연료전지의 내구성에 영향을 미치는 인자에 대한 연구
배선영1, 박미영1, 이종규2, 임형태1
1창원대학교 신소재공학부
2포항산업과학연구원 기후에너지연구그룹
Effects of the Air Flow Rate and Electrolyte Thickness on the Durability of Yttria-doped Barium Cerate (BCY)-based Solid Oxide Fuel Cells
Seon Yeong Bae1, Mi Young Park1, Jong Gyu Lee2, Hyung-Tae Lim1
1School of Materials Science and Engineering, Changwon National University, Changwon 51140, Republic of Korea
2Energy Research Group, Research Institute of Industrial Science & Technology, Pohang 37673, Republic of Korea
Correspondence  Hyung-Tae Lim ,Tel: +82-55-213-3716, Email: htaelim@changwon.ac.kr
Received: 20 September 2016;  Accepted: 18 November 2016.  Published online: 9 May 2017.
ABSTRACT
Anode-supported yttria-doped barium cerate (BCY) electrolyte cells are fabricated and durability tests are conducted as a function of the current density (cell voltage sign), air flow rate, and BCY electrolyte thickness. As the air flow rate increases and the current density decreases (from negative to positive cell voltage), the cell voltage drop rate is reduced during the constant current test. The thick (18 μm) electrolyte cell exhibits relatively stable performance in comparison with the thin (10 μm) electrolyte cell. Electrolyte/electrode delamination is not observed on the cells, even after the negative voltage operation, and this is attributed to sufficient electronic conduction inside the BCY electrolyte. Thus, the present work indicates that the durability of BCY-based cells can be improved with optimization of the air utilization and electrolyte thickness.
Keywords: solid oxide fuel cell, proton conductor, barium cerate, degradation mechanism
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