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Improving Grain Boundary Conductivity of Ce0.9Gd0.1O2 − δ Electrolyte through Compositing with Carbonate or Semiconductor
Energy Technology ( IF 3.6 ) Pub Date : 2020-07-11 , DOI: 10.1002/ente.202000424 Xiaomi Zhou 1 , Chen Xia 1 , Xunying Wang 1 , Wenjing Dong 1 , Baoyuan Wang 1
Energy Technology ( IF 3.6 ) Pub Date : 2020-07-11 , DOI: 10.1002/ente.202000424 Xiaomi Zhou 1 , Chen Xia 1 , Xunying Wang 1 , Wenjing Dong 1 , Baoyuan Wang 1
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In the solid oxide fuel cell field, heterogeneous ion doping is a common methodology to improve the ionic conductivity of electrolytes, but overwhelming grain boundary resistance is still the main obstacle for low‐temperature applications. According to previous reports, building rapid ion transport at the grain boundary through compositing methods was considered as a proposed design for electrolytes to decrease the grain boundary resistance and obtain high ionic conductivity. Herein, Ce0.9Gd0.1O2 − δ (GDC) is selected as the matrix material and composited with Na2CO3 and NdBa0.5Sr0.5Cu2O5 + δ (NBSCu) to form GDC‐Na2CO3 nanocomposite and GDC‐NBSCu composite. The grain boundary conductivity (σb) is delicately separated from the EIS results, demonstrating that the σb of GDC‐NBSCu and GDC‐Na2CO3 composite are both substantially higher than that of pure GDC. Therefore, the power density maximum of GDC‐NBSCu and GDC‐Na2CO3 electrolyte is 726 mW cm−2 at 600 °C and 797 mW cm−2 at 575 °C, respectively. Variety of characterization reveales that the proton contributes to the enhancement of σb in GDC‐Na2CO3, while the band energy alignment between GDC and NBSCu works as an accelerator to promote the ionic conduction for GDC‐NBSCu.
中文翻译：
通过碳酸盐或半导体复合提高Ce0.9Gd0.1O2-δ电解质的晶界电导率
在固体氧化物燃料电池领域，异质离子掺杂是提高电解质的离子电导率的常用方法，但是压倒性的晶界电阻仍然是低温应用的主要障碍。根据以前的报道，通过复合方法在晶界处建立快速离子迁移被认为是电解质的拟议设计，以降低晶界电阻并获得高离子电导率。在此，选择Ce 0.9 Gd 0.1 O 2- δ（GDC）作为基质材料，并与Na 2 CO 3和NdBa 0.5 Sr 0.5 Cu 2 O 5 + δ复合。（NBSCu）形成GDC-Na 2 CO 3纳米复合材料和GDC-NBSCu复合材料。晶界电导率（σ b）是精心从EIS结果分开，这表明σ b GDC-NBSCu和GDC-的Na 2 CO 3复合物都较纯的GDC实质上更高。因此，GDC-NBSCu和GDC-Na 2 CO 3电解质的最大功率密度在600°C下为726 mW cm -2，在575°C下为797 mW cm -2。表征reveales的品种，质子有助于的提高σ b在GDC娜2 CO 3，而GDC和NBSCu之间的能带对准充当促进剂，以促进GDC-NBSCu的离子传导。
更新日期：2020-09-05
中文翻译：
通过碳酸盐或半导体复合提高Ce0.9Gd0.1O2-δ电解质的晶界电导率
在固体氧化物燃料电池领域，异质离子掺杂是提高电解质的离子电导率的常用方法，但是压倒性的晶界电阻仍然是低温应用的主要障碍。根据以前的报道，通过复合方法在晶界处建立快速离子迁移被认为是电解质的拟议设计，以降低晶界电阻并获得高离子电导率。在此，选择Ce 0.9 Gd 0.1 O 2- δ（GDC）作为基质材料，并与Na 2 CO 3和NdBa 0.5 Sr 0.5 Cu 2 O 5 + δ复合。（NBSCu）形成GDC-Na 2 CO 3纳米复合材料和GDC-NBSCu复合材料。晶界电导率（σ b）是精心从EIS结果分开，这表明σ b GDC-NBSCu和GDC-的Na 2 CO 3复合物都较纯的GDC实质上更高。因此，GDC-NBSCu和GDC-Na 2 CO 3电解质的最大功率密度在600°C下为726 mW cm -2，在575°C下为797 mW cm -2。表征reveales的品种，质子有助于的提高σ b在GDC娜2 CO 3，而GDC和NBSCu之间的能带对准充当促进剂，以促进GDC-NBSCu的离子传导。
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