Quantitative Study on the Correlation between Solid Oxide Fuel Cell Ni-YSZ Composite Anode Performance and Reduction Temperature Based on Three-Dimensional Reconstruction
Quantitative Study on the Correlation between Solid Oxide Fuel Cell Ni-YSZ Composite Anode Performance and Reduction Temperature Based on Three-Dimensional Reconstruction
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DOI：
10.1149/2.0721506jes
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发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Shikazono, Naoki
中科院分区：
文献类型：
--
作者：
Jiao, Zhenjun;Shikazono, Naoki
研究了还原温度对镍钇稳定氧化锆复合固体氧化物燃料电池阳极初始性能和短时耐久性的影响。基于聚焦离子束扫描电镜技术进行三维重建，对运行100 h前后的阳极微观结构进行定量分析。 500℃还原的阳极表现出最差的初始性能和运行稳定性，这归因于最小的镍-氧化钇稳定-氧化锆界面面积和低温还原中形成的多孔镍。800℃还原的阳极表现出最小的极化电阻，这归因于最大的活性三相边界密度。在1000℃还原的阳极表现出最稳定的性能，并且在操作中极化电阻增强，这归因于最大的比镍-氧化钇稳定-氧化锆界面面积以及在高温还原中形成的致密镍相。研究发现，阳极的性能不仅取决于活性三相边界密度，还取决于复合阳极中镍与氧化钇稳定氧化锆之间的界面结合。随着还原温度的升高，镍-氧化钇稳定-氧化锆界面结合增强，能够抑制镍的烧结，提高负极在长期运行中的性能稳定性。 (C) 作者 2015 年。ECS 出版。版权所有。
The effects of reduction temperature on the initial performances and short-time durability of nickel-yttria-stabilized zirconia composite solid oxide fuel cell anodes were investigated. The anode microstructures before and after 100 hours operation were quantitatively analyzed by three-dimensional reconstruction based on focused ion beam-scanning electron microscopy technique. The anode reduced at 500 degrees C showed the worst initial performance and stability in operation which was attributed to the smallest specific nickel-yttria-stabilized-zirconia interface area and the very porous nickel formed in low temperature reduction, The anode reduced at 800 degrees C showed the smallest polarization resistance which was attributed to the largest active three phase boundary density. The anode reduced at 1000 degrees C showed the most stable performance with polarization resistance enhanced in operation, which was attributed to the largest specific nickel-yttria-stabilized-zirconia interface area and the dense nickel phase formed in high temperature reduction. It is found that the performance of anode is determined not only by the active three phase boundary density but also the interface bonding between nickel and yttria-stabilized-zirconia in composite anode. Nickel-yttria-stabilized-zirconia interfacial bonding can be enhanced with the increase of reduction temperature, which is able to inhibit the nickel sintering and improve the anode performance stability in long-time operation. (C) The Author(s) 2015. Published by ECS. All rights reserved.