Ni/YSZ anode Effect of pre-treatments on cell degradation and microstructures
Ni/YSZ anode Effect of pre-treatments on cell degradation and microstructures
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Ni/YSZ 阳极 预处理对电池降解和微观结构的影响
DOI：
10.1016/j.jpowsour.2011.01.009
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. Mogensen
中科院分区：
文献类型：
--
作者：
A. Hauch;P. S. Jørgensen;K. Brodersen;M. Mogensen
测试了阳极支撑（Ni/YSZ-YSZ-LSM/YSZ）固体氧化物燃料电池，并通过阻抗谱监测和分析了数百小时内的退化。选择测试条件以关注Ni/YSZ阳极降解，并且所有测试均在750°C、0.75Acm−2的电流密度下操作。向阴极供应氧气，阳极入口气体混合物具有0.4/0.6的高p（H2O）/p（H2）比。使用市售气体。研究了不同类型的预处理对后续燃料电池测试期间Ni/YSZ电极降解的影响。预处理包括在燃料电池测试之前在OCV（H2中4%和40%H2O）下操作，在700°C下清洁入口H2气体，以及经由多层带流延处理阳极半电池。阻抗谱的分析表明，当与未预处理的参比测试电池相比时，对于预处理的和燃料电池测试的电池，Ni/YSZ（RNi，TPB）中的电荷转移反应电阻的增加降低至1/4或更小;所有电池都在相同的燃料电池测试条件下操作。对未预处理的参比测试电池和所选预处理电池的扫描电子显微镜和图像分析显示，活性阳极和支撑层中的电镀镍的面积分数存在显著差异。
Anode supported (Ni/YSZ–YSZ–LSM/YSZ) solid oxide fuel cells were tested and the degradation over hundreds of hours was monitored and analyzed by impedance spectroscopy. Test conditions were chosen to focus on the Ni/YSZ anode degradation and all tests were operated at 750°C, a current density of 0.75Acm−2. Oxygen was supplied to the cathode and the anode inlet gas mixture had a high p(H2O)/p(H2) ratio of 0.4/0.6. Commercially available gasses were applied. The effect of different types of pre-treatments on the Ni/YSZ electrode degradation during subsequent fuel cell testing was investigated. Pre-treatments included operating at OCV (4% and 40% H2O in H2) prior to fuel cell testing, cleaning of the inlet H2gas at 700°C and processing the anode half cell via multilayer tape casting. Analyses of impedance spectra showed that the increase in the charge transfer reaction resistance in the Ni/YSZ (RNi,TPB) was decreased to ¼ or less for the pre-treated and fuel cell tested cells when compared with a non-pre-treated reference tested cell; all operated at the same fuel cell test conditions. Scanning electron microscopy and image analyses for the non-pre-treated reference tested cell and selected pre-treated cells showed significant differences in the area fractions of percolating nickel both in the active anode and support layer.