Influence of sintering temperature on ceramic fuel cell electrolyte conductivity with lithium-compound electrode. Issue 11 (1st August 2020)

• Record Type: Journal Article
• Authors: He, Yang; Chen, Gang; Zhang, Xuebai; Zhang, Linlin; Yang, Di; Asghar, Muhammad Imran; Geng, Shujiang; Lund, Peter D.
• Is Part Of: Ceramics international. Volume 46:Issue 11(2020)Part A
• Page Start: 17545
• Page End: 17552
• Publication Date: 2020-08-01
• Subjects: Ceramic fuel cell -- Ni0.8Co0.15Al0.05LiO2 -- LiOH -- Li2CO3 -- Conductivity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.04.053
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Using lithium compounds as anode in ceramic fuel cells will form LiOH/Li2 CO3 at the anode, which diffuse into the Gd-doped CeO2 (GDC) electrolyte significantly improving its ionic conductivity. Here the importance of the density and microstructure of the electrolyte on this conductivity improvement is analyzed. Test cells with Ni0.8 Co0.15 Al0.05 LiO2 (NCAL) electrode and GDC electrolyte are prepared at four sintering temperatures of 900, 1100, 1300, and 1550 °C. The amount of LiOH/Li2 CO3 that enters into the electrolyte from the NCAL anode decreases with increasing sintering temperature, which led to lower electrolyte ionic conductivity and fuel cell performance. The results of XPS and EPR show that the concentration of oxygen vacancy in GDC containing LiOH/Li2 CO3 increased significantly. The effective interface of LiOH/Li2 CO3 -GDC composite electrolyte results in higher ionic conductivity as compared to the composite electrolytes with larger grains and a smaller amount of LiOH/Li2 CO3 due to higher sintering temperatures.