L. Bernadet, F. Buzi, F. Baiutti, J. Segura-Ruiz, J. Dolado, D. Montinaro, M. Torrell, A. Morata, A. Tarancón
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Despite the relevance of this solution, the impact of the barrier layer thickness on the final performance of the cells is still unknown. In this work, gadolinia-doped ceria barrier layers with thicknesses between 200 and 800 nm made by pulsed laser deposition were studied in button cells. Excellent electrochemical performance was obtained for all the cells, improving 45% of the power output of the reference counterparts. Moreover, durability tests performed on the cell with the thinnest layer (200 nm) did not show any measurable degradation for 3500 h of continuous operation under high current densities of 0.77 A cm−2 (∼0.87 V) at 750 °C. Post-mortem characterization by synchrotron nano-x-ray fluorescence of a pristine cell and the aged cell allowed us to observe that some spots of SrZrO3 were present at the cathode/electrolyte interface since the cell manufacturing step without increasing during long-term operation. 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引用次数: 0
摘要
高效固体氧化物电池是基于可再生氢的可持续未来最有前途的技术之一。锆基电解质和最先进的氧电极之间的扩散阻挡层旨在限制电绝缘二次相的形成,从而大大降低电池的性能。通过丝网印刷技术制造的传统阻隔层导致多孔微结构,从而形成绝缘的SrZrO3,部分阻断细胞的活性区域。相反,均匀和致密的屏障层已被证明是限制相互扩散的最终解决方案,大大提高了电池的性能。尽管该解决方案具有相关性,但阻挡层厚度对电池最终性能的影响仍然未知。本文研究了用脉冲激光沉积方法在纽扣电池中制备厚度为200 ~ 800 nm的钆掺杂二氧化铈阻挡层。所有电池都获得了优异的电化学性能,输出功率比对照电池提高了45%。此外,在750°C下0.77 A cm−2 (~ 0.87 V)的高电流密度下,对最薄层(200 nm)的电池进行的耐久性测试显示,在连续运行3500小时时,没有任何可测量的退化。通过同步加速器纳米x射线荧光对原始细胞和老化细胞进行解剖表征,我们观察到自电池制造步骤以来,阴极/电解质界面上存在一些SrZrO3斑点,而在长期操作中没有增加。事实上,这个绝缘阶段的不连续性似乎对电池的运行并不重要。
Thickness effect of thin-film barrier layers for enhanced long-term operation of solid oxide fuel cells
Highly efficient solid oxide cells are one of the most promising technologies for a sustainable future based on renewable hydrogen. The diffusion barrier layer employed between zirconia-based electrolytes and state-of-the-art oxygen electrodes aims to limit the formation of electrically insulating secondary phases that dramatically reduce the cells’ performance. Conventional barrier layers manufactured by screen-printing technology lead to porous microstructures that enable the formation of insulating SrZrO3, partially blocking the active area of the cells. Opposite, homogeneous and dense barrier layers have proven to be the ultimate solution to limit interdiffusion, substantially improving the cells’ performance. Despite the relevance of this solution, the impact of the barrier layer thickness on the final performance of the cells is still unknown. In this work, gadolinia-doped ceria barrier layers with thicknesses between 200 and 800 nm made by pulsed laser deposition were studied in button cells. Excellent electrochemical performance was obtained for all the cells, improving 45% of the power output of the reference counterparts. Moreover, durability tests performed on the cell with the thinnest layer (200 nm) did not show any measurable degradation for 3500 h of continuous operation under high current densities of 0.77 A cm−2 (∼0.87 V) at 750 °C. Post-mortem characterization by synchrotron nano-x-ray fluorescence of a pristine cell and the aged cell allowed us to observe that some spots of SrZrO3 were present at the cathode/electrolyte interface since the cell manufacturing step without increasing during long-term operation. Indeed, the discontinuity of this insulating phase seems not to be critical for cell operation.