화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.17, No.3, 439-444, May, 2011
DOI10.1016/j.jiec.2010.10.016  Export Citation
Ce0.8Gd0.2O2 modification on La0.6Sr0.4Co0.2Fe0.8O3 cathode for improving a cell performance in intermediate temperature solid oxide fuel cells
Jeong Woo Yun, Jonghee Han1, Sung Pil Yoon1, †, Sanggyun Park1, Hee Su Kim1, and Suk Woo Nam1
  • School of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea
  • 1Fuel Cell Research Center, Korea Institute of Science & Technology, Seoul 136-791, Republic of Korea
E-mail:
To increase the cell performance of solid oxide fuel cells operated at intermediate temperature (600- 800℃ ), Ce0.8Gd0.2O2 (GDC) was applied to the La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode in electrode microstructure using sol-gel coating. We employed a GDC as a diffusion barrier layer on the yttriastabilized zironia (YSZ) electrolyte to prevent the interlayer formation of SrZrO3, which has poor ionic conductivity. This interfacial reaction product was hardly formed at the electrolyte-cathode interlayer after sintering the GDC layer resulting to reduce the cathode polarization resistance. Moreover, we use sol-gel method to coat GDC thin layer through the cathode pore wall surface to extend the triple phase boundary (TPB) area. The cathode polarization resistance also reduced due to the additional TPB area. For the single cell featuring LSCF cathode modified with GDC sol-gel coating, the maximum densities were 0.41 W/cm2 and 0.89 W/cm2 at 700 ℃ and 800 ℃.
Keywords:Intermediate-temperature solid oxide fuel cel;Diffusion barrier layer Ce0.8Gd0.2O2;La0.6Sr0.4Co0.2Fe0.8O3
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