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用于二氧化碳渗透的W掺杂镧钼氧化物/碳酸锂-钠-钾复合膜

W-doped Lanthanum Molybdenum Oxide/Lithium-Sodium-Potassium Carbonate Composite Membranes for Carbon Dioxide Permeation.

作者信息

Medina Midilane S, Carvalho Sabrina G M, Tabuti Francisco N, Muccillo Eliana N S, Fonseca Fábio C, Muccillo Reginaldo

机构信息

Center of Science and Technology of Materials, Energy and Nuclear Research Institute, Sao Paulo 05508-000, Brazil.

Center of Fuel Cells and Hydrogen, Energy and Nuclear Research Institute, Sao Paulo 05508-000, Brazil.

出版信息

Materials (Basel). 2023 Jul 20;16(14):5128. doi: 10.3390/ma16145128.

DOI:10.3390/ma16145128
PMID:37512402
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10386737/
Abstract

Single-phase tungsten-doped lanthanum molybdenum oxide (LaMoWO) ceramic powders were synthesized using the complex polymerization technique. Porous ceramic pellets were obtained by thermally removing graphite, which served as a pore former. The porous pellets were then impregnated with molten eutectic lithium-sodium-potassium carbonates. The energy dispersive X-ray analysis and scanning electron microscopy (FEG-SEM) images of the external and fracture surfaces of the LaMoWO-(Li,Na,K)CO composite dual-phase membrane revealed the percolation of the carbonate mixture through the pores. Electrochemical impedance spectroscopy measurements conducted at temperatures below and above the melting point of the eutectic carbonate composition demonstrated the contributions of oxygen and carbonate ions to the ionic conductivity of the dual membrane. The electrical conductivity of the carbonate ions within the membrane was continuously monitored for over 1300 h with negligible degradation, implying that the membrane could be used for long-term monitoring of CO without aging effects. A comparison of FEG-SEM images taken before and after this endurance test suggested minimal fouling, indicating that the membrane could potentially replace similar zirconia- and ceria-based composite membranes.

摘要

采用复合聚合法合成了单相钨掺杂钼酸镧（LaMoWO）陶瓷粉末。通过热去除用作造孔剂的石墨获得多孔陶瓷颗粒。然后将多孔颗粒浸渍在熔融的共晶碳酸锂 - 钠 - 钾中。LaMoWO-(Li,Na,K)CO复合双相膜外表面和断裂表面的能量色散X射线分析及扫描电子显微镜（场发射扫描电子显微镜，FEG-SEM）图像显示了碳酸盐混合物通过孔隙的渗透情况。在低于和高于共晶碳酸盐组合物熔点的温度下进行的电化学阻抗谱测量表明，氧离子和碳酸根离子对双相膜的离子电导率有贡献。对膜内碳酸根离子的电导率进行了超过1300小时的连续监测，降解可忽略不计，这意味着该膜可用于长期监测CO且无老化影响。该耐久性测试前后拍摄的场发射扫描电子显微镜图像比较表明污垢极少，这表明该膜有可能替代类似的氧化锆和氧化铈基复合膜。

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