Lanthanum silicate-based layered electrolyte for intermediate-temperature fuel cell application
Lanthanum silicate-based layered electrolyte for intermediate-temperature fuel cell application
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DOI：
10.1016/j.jpowsour.2020.228543
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发表时间：
2020-11-01
影响因子：
9.2
通讯作者：
Matsui, Junji
中科院分区：
文献类型：
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作者：
Mineshige, Atsushi;Saito, Atsushi;Matsui, Junji
制备了一种以硅酸氧磷灰石（La9.33+xSi6O26+1.5x， LSO）为基体材料的氧化离子（O2-）导电膜电池，该电池在中温区（873 K）具有较低的欧姆电阻和极化电阻。采用另一种不导电的硅酸镧La2SiO5改性的高导电性掺镁LSO La-9.8(Si5.7Mg0.3)O-26.4 （MDLS）作为固体电解质。在Ni-MDLS多孔阳极载体上依次自旋涂覆两种硅酸盐层，然后进行热处理，旨在通过固态反应扩散提高离子电导率和MDLS的致密化。此外，还在改性MDLS电解质上自旋涂覆了gd掺杂的CeO2 (Ce0.9Gd0.1)O-1.95 （GDC）电解质层，该电解质层对防止电解质与正极材料之间的反应起着重要作用。最后，将多孔的（La,Sr）（Co,Fe）O3-delta阴极层丝网印刷在电解质层上。在氩气稀释的氢气和纯氧环境下，该电池在873 K下的最大功率密度为94 mW cm(-2)，表现出良好的燃料电池性能。
An oxide ion (O2-) conducting membrane cell, based on lanthanum silicate oxyapatite (La9.33+xSi6O26+1.5x, LSO), exhibiting low ohmic and polarization resistances in the intermediate-temperature region (similar to 873 K) was developed. As a solid electrolyte, highly conductive Mg-doped LSO, La-9.8(Si5.7Mg0.3)O-26.4 (MDLS), modified with another kind of non-conductive lanthanum silicate, La2SiO5 was employed. Two kinds of silicate layers were successively spin-coated on a Ni-MDLS porous anode support, followed by thermal treatment aimed at improving ionic conductivity as well as densification of MDLS through solid state reactive diffusion. In addition, the Gd-doped CeO2, (Ce0.9Gd0.1)O-1.95 (GDC) electrolyte layer, which plays an important role to prevent a reaction between the electrolyte and cathode materials, was spin-coated on the modified MDLS electrolyte. Finally, the cathode layer of porous (La,Sr)(Co,Fe)O3-delta was screen printed on the electrolyte layers. The resulting cell obtained from this study showed good fuel cell performance with a maximum power density of 94 mW cm(-2) at 873 K, when operated with argon-diluted hydrogen and pure oxygen gasses.