Influence of sintering temperature on ceramic fuel cell electrolyte conductivity with lithium-compound electrode
| Autor: | Xuebai Zhang, Shujiang Geng, Linlin Zhang, Peter Lund, Yang He, Gang Chen, Muhammad Asghar, Di Yang |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Sintering chemistry.chemical_element 02 engineering and technology Electrolyte Conductivity 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Anode chemistry Chemical engineering visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ionic conductivity Lithium Ceramic 0210 nano-technology |
| Zdroj: | Ceramics International. 46:17545-17552 |
| ISSN: | 0272-8842 |
| Popis: | Using lithium compounds as anode in ceramic fuel cells will form LiOH/Li2CO3 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 Ni0.8Co0.15Al0.05LiO2 (NCAL) electrode and GDC electrolyte are prepared at four sintering temperatures of 900, 1100, 1300, and 1550 °C. The amount of LiOH/Li2CO3 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/Li2CO3 increased significantly. The effective interface of LiOH/Li2CO3-GDC composite electrolyte results in higher ionic conductivity as compared to the composite electrolytes with larger grains and a smaller amount of LiOH/Li2CO3 due to higher sintering temperatures. |
| Databáze: | OpenAIRE |
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