复合阳极NiO-SDC+LSGM的性能研究

Study on performance of composite anode Ni-SDC+LSGM

采用共压-共烧结法分别制备了以50%(质量分数)NiO-(50-x)%(质量分数)Ce0.8Sm0.2O1.9(SDC)+x%(质量分数)La0.9Sr0.1Ga0.8Mg0.2O3-a(LSGM)(x=0、10、20、30、40)为阳极支撑,LSGM为电解质、La0.9Sr0.1Co0.2Fe0.8O3-δ(LSCF)+Ce0.8Gd0.2O2-δ(GDC)为复合阴极的单电池片;用扫描电子显微镜(SEM)观察了电池片的微观结构;用X射线衍射(XRD)法分析了阳极材料于1250℃条件下烧结4h后的晶相结构;在350～600℃之间,以50℃为间隔,以干天然气为燃料气、氧气为氧化气测试了其电化学性能。结果表明:单电池阳极材料具有良好的孔道结构;在测试条件下,五种不同阳极组成的单电池中50%(质量分数)NiO-30%(质量分数)SDC+20%(质量分数)LSGM阳极支撑的单电池具有最佳的电化学性能,对天然气有更好的催化效果,在常压和600℃条件下其最大电流密度为229.32mA/cm2,最大比功率为45.86mW/cm2。

The 50%NiO-（50-x）%Ce0.8Sm0.2O1.9（SDC）＋x%La0.9Sr0.1Ga0.6Mg0.2O3-α（LSGM） （x=0, 10, 20, 30, 40） anode supported cells were fabricated by dry-pressing process using LSGM as electrolyte and 85% LSCF＋15% GDC as cathode. The crystal microstructure of cells was observed by scanning electron microscope （SEM）. The crystal forms of the anode materials which had been sintered 4 h in 1 250 ℃ were analyzed by X-ray diffraction. The composite anode cells were tested and compared with un-composite anode cell from 350-600 ℃ every 50 ℃, using dry natural gas as fuel and oxygen as oxidant. The results of experiment show that the anode of the cells has good structure of hole. The 50% NiO-30% SDC＋20% LSGM anode supported-cell has the best electrochemical performance among the five cells. The composite anode cell has better catalyze for natural gas than un-composite anode cell. The composite anode cell of maximum current density and power density at 600 ℃ are 229.32 mA/cm^2 and 45.86 mW/cm^2, respectively.