Low temperature fabrication of dense gadolinia-doped ceria electrolyte with enhanced electrical conductivity

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• 作者：Jinping Liang ; ^{jinpingliang@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：ceria ; sintering ; solid oxide fuel cell ; electrical conductivity ; electrolyte
• 刊名：Electrochimica Acta
• 出版年：2015
• 出版时间：1 October 2015
• 年：2015
• 卷：178
• 期：Complete
• 页码：321-328
• 全文大小：2813 K

文摘

By combination of supercritical drying route and coprecipitation synthesis method, ultrafine Ce_0.8Gd_0.2O_1.9 (GDC20) nano-powders are successfully prepared using (NH₄)₂CO₃ as the precipitant. The as-synthesized powder has a specific surface area of 113.4 m² g⁻¹ and an average crystalline size of ∼6 nm after calcination at 400 °C, together with other favorable properties like high dispersibility, weak agglomeration and remarkable flowability. The powder shows high sintering activity, where the relative density reaches ∼99.9% with an average grain size of ∼100 nm after sintered at 900 °C for 4 h. Low temperature sintering not only suppresses grain growth but also improves electrical performance of the electrolyte. The sample sintered at 900 °C exhibits high electrical conductivity of 5.39 S m⁻¹ at 700 °C, which is superior to most of the reported ceria-based electrolyte.