Abstract Direct methane-fueled solid oxide fuel cells (DM-SOFCs) are promising next-generation energy conversion devices, in which, however, anode reactions should be facilitated for high performance even at low temperature. Herein, we report on compositional gradient cermet anode for DM-SOFCs operated at 450 °C using co-sputtering method. The cell with the gradient cermet anode demonstrates approximately 0.1 V higher open-circuit voltage and 36 % better power density than the cell with homogeneous one. Moreover, the thermal stability of the cell with the gradient cermet anode (3.7 % h-1 at 450 °C) is improved compared to the cell with homogeneous one (4.5 % h-1). Higher coking resistance is also observed in the cell with the gradient cermet anode with low carbon content after operation. The combination of high triple phase boundary density preserved well at elevated temperature and percolating ceria network may be the reason for such improvements in the cell with the gradient cermet anode.

中文翻译：

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用于直接甲烷固体氧化物燃料电池的 Ru/Samaria 掺杂的氧化铈梯度金属陶瓷阳极

摘要 直接以甲烷为燃料的固体氧化物燃料电池（DM-SOFCs）是有前途的下一代能量转换装置，然而，即使在低温下也应促进阳极反应以实现高性能。在此，我们报告了使用共溅射方法在 450°C 下运行的 DM-SOFC 的成分梯度金属陶瓷阳极。具有梯度金属陶瓷阳极的电池的开路电压比均质电池高约 0.1 V，功率密度高 36%。此外，与具有均质阳极的电池（4.5 % h-1）相比，具有梯度金属陶瓷阳极（450 °C 时为 3.7 % h-1）的电池的热稳定性得到了改善。在具有低碳含量的梯度金属陶瓷阳极的电解槽中也观察到更高的抗结焦性。