Enhancing oxygen permeation through Fe2NiO4–Ce0.8Tb0.2O2−δ composite membranes using porous layers activated with Pr6O11 nanoparticles†,Journal of Materials Chemistry A

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Enhancing oxygen permeation through Fe2NiO4–Ce0.8Tb0.2O2−δ composite membranes using porous layers activated with Pr6O11 nanoparticles†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-12-12 00:00:00 , DOI: 10.1039/c7ta06485c
Julio García-Fayos _{1,

2,

3,

4} , Rian Ruhl _{5,

6,

7,

8,

9} , Laura Navarrete _{1,

2,

3,

4} , Henny J. M. Bouwmeester _{5,

6,

7,

8,

9} , Jose M. Serra _{1,

2,

3,

4}

Affiliation

Fe₂NiO₄–Ce_0.8Tb_0.2O_2−δ (NFO–CTO) composite membranes are of interest to separate oxygen from air. In this study, we investigate the influence of the catalytic activation of NFO–CTO membranes on the oxygen permeation rate. Specifically, the effect of activating porous NFO–CTO layers –coated on both sides of the dense NFO–CTO membrane – with Pr₆O₁₁ nanoparticles is studied. Measurements in the temperature range 850–700 °C revealed a 2–4 fold increase in the oxygen flux after coating a 30 μm-thick porous NFO–CTO layer on both membrane sides, and a 6–12 fold increase relative to the bare membrane after activating the porous layers coated on both sides of the membrane with Pr₆O₁₁ nanoparticles. No degradation of the oxygen fluxes was found in CO₂-containing atmospheres. Pulse isotopic exchange measurements confirmed an increase in the oxygen surface exchange rate of more than one order of magnitude after dispersion of Pr₆O₁₁ nanoparticles on the surface of NFO–CTO composite powders. Electrochemical impedance spectroscopy measurements on symmetrical cells, using Gd-doped ceria (CGO) as the electrolyte and Pr₆O₁₁-activated NFO–CTO electrodes, showed a 10-fold decrease in the polarization resistance compared to non-infiltrated electrodes in air. Modification of porous layers by activation with Pr₆O₁₁ nanoparticles is considered a viable route to enhance the oxygen fluxes across composite membranes.

中文翻译：

使用由Pr ₆ O ₁₁纳米粒子活化的多孔层增强通过Fe ₂ NiO ₄ -Ce _0.8 Tb _0.2 O _{2- δ}复合膜的透氧性†

Fe ₂ NiO ₄ -Ce _0.8 Tb _0.2 O ₂ - _δ（NFO-CTO）复合膜可用于从空气中分离氧气。在这项研究中，我们研究了NFO-CTO膜的催化活化对氧气渗透速率的影响。具体来说，激活多孔NFO-CTO层的效果-涂在致密NFO-CTO膜的两侧-用Pr ₆ O ₁₁研究了纳米颗粒。在850-700°C的温度范围内进行的测量表明，在膜的两面都涂上30μm厚的多孔NFO-CTO层后，氧通量增加了2-4倍，而相对于裸膜，则增加了6-12倍在活化了用Pr ₆ O ₁₁纳米颗粒涂覆在膜的两面上的多孔层之后。在含CO ₂的气氛中没有发现氧通量的降低。脉冲同位素交换测量结果证实，分散Pr ₆ O ₁₁后，氧表面交换速率增加了一个数量级以上。NFO-CTO复合粉末表面上的纳米颗粒。使用掺d二氧化铈（CGO）作为电解质和Pr ₆ O ₁₁活化的NFO-CTO电极对对称电池进行电化学阻抗谱测量，与空气中未渗透的电极相比，其极化电阻降低了10倍。通过用Pr ₆ O ₁₁纳米颗粒活化来改性多孔层被认为是增强跨复合膜的氧气通量的可行途径。

更新日期：2017-12-12

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