Progress in Ce0.8Gd0.2O2−δ protective layers for improving the CO2 stability of Ba0.5Sr0.5Co0.8Fe0.2O3−δ O2-transport membranes,Sustainable Energy & Fuels

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Progress in Ce0.8Gd0.2O2−δ protective layers for improving the CO2 stability of Ba0.5Sr0.5Co0.8Fe0.2O3−δ O2-transport membranes
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-05-14 , DOI: 10.1039/d0se00324g
Cecilia Solís _{1,

2,

3,

4} , María Balaguer _{1,

2,

3,

4} , Julio Garcia-Fayos _{1,

2,

3,

4} , Elena Palafox _{1,

2,

3,

4} , José M. Serra _{1,

2,

3,

4}

Affiliation

Ce_0.8Gd_0.2O_2−δ (CGO) thin films were deposited by radio frequency (RF) magnetron sputtering and deposition temperature was changed in order to optimize the microstructure and transport properties of the obtained films. Afterwards, the films were deposited on Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ (BSCF) oxygen separation membranes as CO₂ protective layers. Oxygen permeation was finally measured by sweeping both Ar and CO₂, and the obtained results were compared with the bare BSCF membrane. It was found that the oxygen permeation of the BSCF is improved by this CGO layer, with a 4-fold improvement in the oxygen permeation flux when using pure CO₂ as the sweep gas at 900 °C. Therefore, these CGO protective layers are a promising way for overcoming the limitations of BSCF membranes in CO₂-containing environments, associated with surface competitive O₂–CO₂ adsorption and carbonation of Ba at low temperatures.

中文翻译：

Ce0.8Gd0.2O2-δ保护层用于改善Ba0.5Sr0.5Co0.8Fe0.2O3-δO2传输膜的CO2稳定性的研究进展

通过射频（RF）磁控溅射沉积Ce _0.8 Gd _0.2 O _{2- δ}（CGO）薄膜，并改变沉积温度，以优化所得薄膜的微观结构和传输性能。然后，将膜沉积在巴_0.5锶_0.5钴_0.8铁_0.2 ø _{3- δ}（BSCF）氧分离膜的CO ₂的保护层。最后通过扫除Ar和CO ₂来测定氧气的渗透率，并将获得的结果与裸露BSCF膜进行比较。发现通过该CGO层改善了BSCF的氧气渗透，当在900℃下使用纯CO ₂作为吹扫气体时，氧气渗透通量提高了4倍。因此，这些CGO保护层是克服BSCF膜在含CO ₂的环境中与低温下Ba的表面竞争性O ₂ -CO ₂吸附和碳酸化相关的局限性的有希望的方法。

更新日期：2020-06-30

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