(Invited) MIEC Materials for Membrane Applications: Enhancing the Oxygen Transport
(Invited) MIEC Materials for Membrane Applications: Enhancing the Oxygen Transport
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（特邀）膜应用的MIEC材料：增强氧传输
DOI：
10.1149/06101.0283ecst
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发表时间：
2014
影响因子：
22.1
通讯作者：
S. Wagner
中科院分区：
文献类型：
--
作者：
E. Ivers;C. Niedrig;S. Wagner
巴0。 5Sr0。 5Co0。 8Fe0。 2O3-δ，La0。 58Sr0。 4Co0。 2Fe0. 8O3-δ，或La0。 6Sr0。 4CoO3-δ表现出优异的氧离子和电子传输特性，因此是高渗透OTM的有希望的候选者。不过，首先必须确定它们在广泛的氧分压 pO2 范围内的化学稳定性和电化学传输特性（D δ 和 k δ）。这都可以通过定制的氧化锆“氧气泵”装置来实现。表面氧交换 (k δ) 成为高性能薄 OTM 氧气渗透的速率决定因素。氧通量的进一步增加需要增强表面交换。这可以通过用多孔功能层修饰 OTM 表面来实现。借助 3D FEM OTM 模型，可以轻松评估传输参数和功能层微观结构（厚度、孔隙率、粒径）的相互作用。
Ba0. 5Sr0. 5Co0. 8Fe0. 2O3-δ, La0. 58Sr0. 4Co0. 2Fe0. 8O3-δ, or La0. 6Sr0. 4CoO3-δ exhibit excellent oxygen-ionic and electronic transport properties and are, hence, promising candidates for high-permeation OTMs. It is essential, though, to determine their chemical stability and electrochemical transport properties (D δ and k δ) over a broad range of oxygen partial pressure pO2 first. This can both be achieved in a custom-made zirconia “oxygen pump” setup. Surface oxygen exchange (k δ) becomes rate-determining for oxygen permeation of high-performing thin OTMs. Further increase of oxygen flux requires an enhancement of surface exchange. This can be achieved by modifying the OTM surfaces with a porous functional layer. With the help of a 3D FEM OTM model the interplay of transport parameters and functional-layer microstructure (thickness, porosity, particle sizes) can be readily assessed.