LiNiCoAlO (NCAL) is reported to provide dual catalytic activities of hydroxide reaction (HOR) and oxygen reduction reaction (ORR) in solid oxide fuel cell. However, it has been observed that the performance of NCAL symmetric electrodes undergoes a gradual decrease during fuel cell operation, especially the cathode, which was found to suffer from severe gas diffusion degradation. In this study, we tried to optimize the NCAL cathode by modifying the microstructure in order to increase the cathode performance under extended operation time. During the fabrication of SOFCs, various mass ratios of poly (methyl methacrylate) (PMMA) microspheres were introduced into the NCAL cathode as pore former. The affection of pore former ratio and its size on cell performance is investigated. Results suggest that properly increasing the porosity of the cathode is of significant importance for improving cathode performance, but additionally increasing the porosity of the anode by pore-former is not a wise choice. Besides, considering the oxidation of nickel foam at the cathode, comparative study on the application of nickel foam is carried out to understand its role. In addition, the performance of the cells over a continuous operation for hours has been studied to evaluate the effectiveness of the optimization method. This study provides reference for improving the performance of SOFC based on NCAL electrodes.

中文翻译：

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通过阴极修饰提高LiNi0.8Co0.15Al0.05O2-δ电极燃料电池性能

据报道，LiNiCoAlO（NCAL）在固体氧化物燃料电池中提供氢氧化物反应（HOR）和氧还原反应（ORR）的双重催化活性。然而，据观察，NCAL对称电极的性能在燃料电池运行过程中逐渐下降，特别是阴极，被发现遭受严重的气体扩散退化。在本研究中，我们尝试通过修改微观结构来优化 NCAL 阴极，以提高阴极在延长运行时间下的性能。在 SOFC 的制造过程中，将不同质量比的聚甲基丙烯酸甲酯 (PMMA) 微球作为造孔剂引入 NCAL 阴极中。研究了成孔剂比例及其大小对电池性能的影响。结果表明，适当增加正极的孔隙率对于提高正极性能具有重要意义，但通过造孔剂额外增加负极的孔隙率并不是明智的选择。此外，考虑到泡沫镍在正极的氧化作用，对泡沫镍的应用进行了对比研究，了解其作用。此外，还研究了电池连续运行数小时的性能，以评估优化方法的有效性。该研究为提高基于NCAL电极的SOFC的性能提供参考。