High-conductivity electrolyte with a low sintering temperature for solid oxide fuel cells. (8th March 2022)

• Record Type: Journal Article
• Authors: Wang, Haoran; Lei, Ze; Jiang, Weiwei; Xu, Xiang; Jing, Junmeng; Zheng, Ziwei; Yang, Zhibin; Peng, Suping
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 21(2022)
• Page Start: 11279
• Page End: 11287
• Publication Date: 2022-03-08
• Subjects: Electrolyte -- Sintering -- Bismuth oxide -- SOFC; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.01.168
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Bismuth oxide and scandia co-doped zirconia (Sc2 O3 )0.06 (Bi2 O3 ) x (ZrO2 )0.94– x (ScSZB, x = 0, 0.01, 0.03, 0.05, 0.07, 0.1) powders are prepared via a citrate sol-gel method. Bi2 O3 promotes the sintering process of scandia stabilized zirconia (ScSZ) and increases electrical conductivity of system. A high conductivity of ∼0.094 S/cm at 800 °C is achieved on 5 mol% Bi2 O3 doped ScSZ (ScSZB05). X-ray Rietveld refinement and transmission electron microscope (TEM) analysis of the ScSZB05 reveal the formation of cubic phase and rhombohedral phase at room temperature. The electrolyte-supported cell constructed by the ScSZ electrolyte gives the maximum power density of 258.3 mW/cm 2 at 800 °C, while the cell with ScSZB05 electrolyte shows a higher value of 387.6 mW/cm 2 . The performance obtained by theoretical simulation of the two electrolyte-supported cells is in good agreement with the experimental results. Highlights: Bismuth oxide and scandia co-doped zirconia electrolytes with low sintering temperature were obtained. Cubic zirconia stabilized by doping bismuth at room temperature. The conductivity of zirconia based electrolyte was improved by doping bismuth oxide.