Properties and performance of La2NiO4+δ-LaNiO3 composite cathodes for intermediate temperature solid oxide fuel cells

• Main Authors: Yen-Ting Lin, 林彥廷
• Other Authors: 邱德威
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/34g787

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 99 === Composite cathodes of La2NiO4+δ-LaNiO3 were prepared for application in intermediate temperature solid oxide fuel cells (IT-SOFCs). La2NiO4+δ and LaNiO3 powders were synthesized by solid state reaction. The effect of composition on the electrical performance of the composite electrodes was studied. The addition of LaNiO3 into La2NiO4+δ increased the electrical conductivity remarkably. The composite cathodes with 50 wt.% LaNiO3 exhibited the highest electrical conductivity of 156 S/cm at 600°C in air. The composite electrode containing 40 wt.% LaNiO3 calcined at 1150°C exhibited the lowest polarization resistance at 700°C in air. The addition of LaNiO3 to La2NiO4+δ cathode reduced the polarization resistance and caused the electrical conductivity to increase with temperature. The corresponding electrical conductivity and thermal expansion mismatch with Ce0.8Sm0.2O1.9 (SDC20) basically satisfied the requirement for cathode material. Controlling the content of LaNiO3 in composite cathode can properly take advantage of LaNiO3 and La2NiO4+δ to achieve better electrical performance and La2NiO4+δ-LaNiO3 is a prospective cathode material for application in intermediate temperature solid oxide fuel cells. All the samples showed high chemical compatibility with electrolyte SDC20, even under the 1000°C thermal treatment.