Effect of inhomogeneous re-oxidation on Ni-based SOFC oxidation resistance
Effect of inhomogeneous re-oxidation on Ni-based SOFC oxidation resistance
复制标题
不均匀再氧化对镍基SOFC抗氧化性能的影响
DOI：
10.1142/s0217979216502003
复制
发表时间：
2016-10
影响因子：
1.7
通讯作者：
Zhao Xiang
中科院分区：
文献类型：
--
作者：
Lou Kang;Wang Feng Hui;Lu Yong Jun;Zhao Xiang
不均匀的二次氧化导致NiO含量沿阳极厚度方向沿着呈梯度分布，已被证实是镍基电池在氧化还原过程中开裂的一个重要原因。本文建立了一个分析模型来评估不均匀再氧化对镍基固体氧化物燃料电池（SOFC）抗氧化性能的影响。并进行了部分再氧化的SOFC模型试验。模拟结果表明，阳极均匀再氧化可显著降低电解质内应力（氧化度为60%时，从367 MPa降至135 MPa），且在氧化度达到70%左右时，电解质仍能保持完整。这种不均匀再氧化对电解质中应力的影响随着阳极厚度的增加而减小。部分氧化的阳极横截面的扫描电子显微镜（SEM）图像证实，Ni氧化是不均匀的，其中阳极的外部区域几乎完全氧化，而内部区域保持金属性。随着氧化还原次数的增加，不均匀性增大。因此，重要的是在氧化过程中避免NiO含量的梯度以防止电池破裂。
Inhomogeneous re-oxidation, which causes graded NiO content along anode thickness, has been confirmed to be a key reason for Ni-based cell cracking during redox progress. In this paper, an analytical model is developed to estimate the impact of inhomogeneous re-oxidation on Ni-based solid oxide fuel cell (SOFC) oxidation resistance. And experiments, in which the SOFC was partially re-oxidized, were implemented for model trial. Model results show that electrolyte internal stress can be significantly reduced (from 367 MPa to 135 MPa, when the oxidation degree is 60%), and the electrolyte can remain intact even when the oxidation degree reaches about 70%, if the anode was re-oxidized uniformly. This impact of inhomogeneous re-oxidation on stress in the electrolyte decreases as the anode thickness increases. Scanning electron microscopic (SEM) images of partially oxidized anode cross-sections confirmed that Ni oxidation was inhomogeneous, in which the outer regions of the anode became almost fully oxidized, while the inner regions remained metallic. And the inhomogeneity increases with the redox times. Consequently, it is important to avoid gradients in NiO content during oxidation progress to prevent cell cracking.
登录
查看更多内容
影响因子：
4.1
作者：
Neng-Hui Zhang;Jian-zhong Chen
通讯作者：
Neng-Hui Zhang;Jian-zhong Chen
影响因子：
1.8
作者：
L. Freud
通讯作者：
L. Freud
影响因子：
3.2
作者：
Neng-Hui Zhang;Jingjing Xing
通讯作者：
Neng-Hui Zhang;Jingjing Xing
影响因子：
9.2
作者：
Faes, Antonin;Nakajo, Arata;Van herle, Jan
通讯作者：
Van herle, Jan
影响因子：
3.2
作者：
A. Atkinson
通讯作者：
A. Atkinson