Cathodic behavior of La0.8Sr0.2Co1-zMnzO3-δ perovskite ozide on YSZ electrolyte for intermediate temperature-operating solid ozide fuel cells
A study of the cathode properties of an intermediate temperature-operating solid oxide fuel cell (IT-SOFC) was carried out using La0.8Sr0.2Co1-x MnxO3-δ (LSCM). LSCM-8246 had the lowest impedance on the 8 mol% yttria-stabilized zirconia (YSZ) electrolyte among the various compositions investigated in this study. A Ce0.9Gd0.1O2-δ (CGO) interlayer between LSCM and YSZ was introduced to inhibit the formation of resistive phases. Cathode impedance was decreased by approximately three times compared to that shown with non-interlayer samples. Investigation of the oxygen partial pressure dependence of LSCM-8246 on CGO-layered YSZ showed that the adsorbed oxygen ionization is the rate-determining step of the cathode reaction. The cathode material and structure can be applied to IT-SOFC at 700℃ because the area-specific resistance is sufficiently low, leading to a cell power density higher than 0.5 W/cm2 at 0.7 V.
Solid ozide fuel cell Cathode Ozygen reduction reaction Surface ezchange Diffusion
Changbo Lee Seung-Wook Baek Joongmyeon Bae
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejeon 305-701, Republic of Korea
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
1465-1469
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）