This study adopts a novel structure design of large-area planar metal-supported solid oxide fuel cell (MS-SOFC), which exhibits the characteristics of self-sealing and high thermal cycling resistance. The self-sealing structure of MS-SOFCs is achieved by brazing technology. Plasma spraying is performed to prepare all functional layers of cells. The size of cells is 10 × 10 cm². The coefficients of thermal expansion of relevant parts (i.e., porous metal support, interconnector and compound structure of both) and the electrical conductivity of brazing solder were measured. The microstructure of brazing area was observed in situ at 800 °C for 500 h, and the distribution of fuel gas in the interconnector was simulated. The performance of cells was characterized and found that the maximum power density can reach up to 716 mW cm⁻² at 700 °C. Moreover, the long-term stability of the cell was investigated for about 500 h with 6 times of thermal cycling implemented during this period. The open circuit voltage and the maximum power density of the cell showed a good stability.

本研究采用大面积平面金属支撑固体氧化物燃料电池（MS-SOFC）的新颖结构设计，具有自密封性和高抗热循环性的特点。MS-SOFC的自密封结构是通过钎焊技术实现的。进行等离子喷涂以制备细胞的所有功能层。电池尺寸为10×10 cm ²。测量了相关部件（即多孔金属支架，互连器和二者的复合结构）的热膨胀系数以及钎焊焊料的电导率。在800°C下进行了500 h原位钎焊区域的微观结构观察，并模拟了燃料气体在互连器中的分布。对电池的性能进行了表征，发现在700°C时，最大功率密度可以达到716 mW cm ^-2。此外，在此期间进行了6次热循环，对电池的长期稳定性进行了约500小时的研究。电池的开路电压和最大功率密度显示出良好的稳定性。