天然气燃料电池中双层阳极Ni-SDC的性能

Performance of double-deck Ni-samaria-doped ceria anode for natural gas fuel cell

采用干压方法制备双层阳极支撑的以BCY20(BaCe0.8Y0.2O3-δ)为电解质的固体氧化物燃料电池。双层阳极的质量分数分别为60%NiO+40%SDC(Ce0.8Sm0.2O2-δ)和30%NiO+70%SDC。阴极采用质量分数分别为85%LSCF(La0.9Sr0.1Co0.2Fe0.8O3-δ)+15%GDC(Ce0.8Gd0.2O2-$)复合阴极。在400～600℃的范围内,用天然气为燃料气,氧气为氧化气,50℃为间隔,测试并比较了该电池与单层阳极支撑电池(阳极质量分数为50%NiO+50%SDC、阴极为85%LSCF+15%GDC复合阴极、电解质为BCY20)的性能。用扫描电镜(SEM)分别分析单电池阳极、阴极及电解质的型貌。实验表明:电池具有良好的微结构,在测试条件下双层阳极支撑电池具有更优的性能。600℃测得电池最大比功率为55mW/cm2,电流密度为253mA/cm2。

Double-deck anode-supported solid state fuel cells （SOFCs） based on BCY20 （BaCe0.8Y0.2O3-δ） were fabricated by dry-pressing process. The double-deck anode consisted of 60% NiO＋40% SDC（Ce0.8Sm0.2O2-δ）, 30% NiO＋70% SDC and the cathode consisted of 85% LSCF （La0.8Sr0.1Co0.2Fe0.8O3-δ）＋15% GDC （Ce0.8Gd0.2O2-δ）. The double-deck anode cell was tested and compared with the single-deck anode cell in the range of temperature, from 400 ℃ to 600 ℃. When dry natural gas was used as fuel and oxygen as oxidant, the maximum power density and current density were 55 mW/cm^2and 253 mA/cm^2 at 600 ℃, respectively. Further the microstructure of the cell, anode and cathode were observed by scanning electron microscope（SEM）.