Analysis of property and application of LSCF–SCDC composite cathode materials

• Main Authors: Jing-Jhan Li, 李京展
• Other Authors: Yu-Chuan Wu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/y7zef3

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 104 === In this study, the anode (60 wt% Ni – 40 wt% Sm0.2Ce0.8O1.9), main electrolytes (Ce0.8Sm0.15Ca0.05O1.875), cathode (La0.6Sr0.4Co0. 2Fe0.8O3–δ), three kind of composite cathode (90 wt% La0.6Sr0.4Co0.2Fe0.8O3–δ – 10 wt% Ce0.8Sm0.15Ca0.05O1.875, 80 wt% La0.6Sr0.4Co0.2Fe0.8O3–δ – 20 wt% Ce0.8Sm0.15Ca0.05O1.875, 70 wt% La0.6Sr0.4Co0.2Fe0.8O3–δ – 30 wt% Ce0.8Sm0.15Ca0.05O1.875) and the Buffer layer (Ce0.8Sm0.15Ca0.05O1.875, La0.4Ce0.6O1.8, La0.85Sr0.15Ga0.8Mg0.2O2.825) were prepared by solid state reaction method. The electrolyte-supported solid oxide fuel cell, symmetrical cell and three-electrode cell with the anode, main electrolytes, cathode and the Buffer layer were prepared in the study. The symmetrical cell were measured by AC impedance analyzer to analysis the impedance of the polarization resistance in cathode. In the meantime we can also calculate the exchange current density and activation energy by using the formula. The three-electrode cell were measured by CV and AC impedance analyzer, and we utilized the formula to calculate the overpotential. The surface morphology and cross-section of the cathode were analyzed by SEM, and utilized the XRD, electrochemical instrument and AC impedance analyzer to understand the effects of adding different Buffer layers on the full cell and their respective power density.