Ce0.8Gd0.2O2 modification on La0.6Sr0.4Co0.2Fe0.8O3 cathode for improving a cell performance in intermediate temperature solid oxide fuel cells

作者：Yun Jeong Woo; Han Jonghee; Yoon Sung Pil^*; Park Sanggyun; Kim Hee Su; Nam Suk Woo

来源：Journal of Industrial and Engineering Chemistry, 2011, 17(3): 439-444.

DOI：10.1016/j.jiec.2010.10.016

• Intermediate-temperature solid oxide fuel cell
• Diffusion barrier layer Ce0.8Cd0.2O2
• La0.6Sr0.4Co0.2Fe0.8O3

To increase the cell performance of solid oxide fuel cells operated at intermediate temperature (600-800 degrees C), 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 yttria-stabilized 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/cm(2) and 0.89 W/cm(2) at 700 degrees C and 800 degrees C.

• 出版日期2011-5-25