阳极组分对热喷涂制备SOFC输出特性的影响

Effect of anode microstructure on performance of SOFC fabricated by thermal spraying

针对传统管状与板块结构SOFC的特点,提出了集两种结构设计的优点为一体的金属陶瓷支撑管状结构SOFC,并采用低成本的火焰喷涂与等离子喷涂制备电池各结构层。采用3种不同成分与结构的阳极探讨了阳极结构对电池输出特性的影响,结果表明,阳极结构对电池运行时的极化产生显著影响,采用小颗粒的NiO与YSZ的复合粉末制备的阳极,可以有效增加阳极的三相界面,从而降低阳极极化,显著提高电池的输出功率密度,1 000℃时可达到最大值0.57 W/cm2。这些结果为优化电池阳极结构层的设计与制备提供了依据。

A cermet supported tubular SOFC was manufactured by thermal spray processes to aim at reducing the production cost. The effect of the anode microstructure on the performance of SOFC was investigated. The results show that the maximum output power density strongly depends on the anode microstructure. The length and density of the three-phase boundaries （TPB） can be increased by decreasing the particle size of YSZ and Ni in composite an- ode. The performance of SOFC can be improved by modifying the active TPB length and TPB density. It is revealed that the present SOFC of the distributed Ni/YSZ composite anode manufactured by thermal spray process reaches to a maximum output power density of 0.57 W/cm^2 at 1 000 ℃. All these results can be used for preparation of optimizing the anode structure.