The effect of NiO addition on the grain boundary behavior and electrochemical performance of Gd-doped ceria solid electrolyte under different sintering conditions

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• 作者：Dan Xu^a ; Kehui Li^a ; Yongjun Zhou^a ; Yang Gao^b ; Duanting Yan^c ; Shifeng Xu^a ; ^{sfxu@sau.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Solid oxide fuel cell ; Transition metal oxides ; CeO2 ; Grain boundary ; Electrochemical performance
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：37
• 期：1
• 页码：419-425
• 全文大小：2808 K

文摘

It has been reported that some transition metal oxides are effective aids both for the densification and the grain boundary behavior of ceria-based electrolytes. In the present work, NiO which is the most popular component of the anode of solid oxide fuel cells was added directly into the electrolyte ceramic, Ce_0.8Gd_0.2O_1.9, to investigate the effects of the presence of NiO on the properties of GDC electrolyte. All of the samples possess a single phase with cubic fluorite structure. The grain size is increased by the addition of NiO when the sintering temperature is 1400 °C. This modification in chemical composition also results in a decrease in activation energy and thus a tendency to enhance grain boundary mobility. The maximum power density of the composite electrolyte single cell is higher than that of a GDC single cell. Therefore, NiO can be used as an effective aid for ceria-based electrolytes.