Characterization of one-step co-fired BaZr0.8Y0.2O3-δ-La2Ce2O7 composite electrolyte for low-temperature solid oxide fuel cells. Issue 11 (September 2021)

• Record Type: Journal Article
• Authors: Bao, Hang; Chen, Ruijie; Wang, Xinrui; Yang, Yang; Lin, Tianqiang; Wang, Xinxin; Ou, Xuemei; Tian, Yunfeng; Ling, Yihan
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 11(2021)
• Page Start: 5531
• Page End: 5540
• Publication Date: 2021-09
• Subjects: Low-temperature solid oxide fuel cells -- Composite electrolyte -- Mixed conductivity -- Sintering activity -- Electrochemical performance; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.04.025
• Languages: English
• ISSNs: 0955-2219

Abstract

Highlights: One-step co-fired BZY-LCO composite electrolyte are prepared and characterized. BZY-LCO can increase sintering activity and cut down internal short-circuit. 3BZY-LCO composite shows the best overall performance. Maximum power density with 3BZY-LCO can reach 0.581 W cm −2 at 750 °C. Composite electrolyte can make up for the shortcomings of BZY and LCO. Abstract: Doped BaZrO3 has outstanding stability and proton conductivity, and doped-ceria La2 Ce2 O7 (LCO) has mixed conductivities of free-electron, oxygen-ion and proton, which are both potential electrolyte materials. Herein, one-step-co-fired BaZr0.8 Y0.2 O3- δ(BZY)-LCO composite electrolytes are prepared and characterized to give play to their respective advantages and avoid their shortcomings for low-temperature solid oxide fuel cells (LT-SOFCs). As for different components of BZY-LCO, the sintering activity increases with the increase of LCO content, however, the corresponding open circuit voltage decreases. Interestingly, the 30 %mol BZY-70 %mol LCO (3BZY-LCO) shows the best overall performance as functions of sintering activity, total conductivity, cell performance. As for the anode supported single cells, the maximum power density of 3BZY-LCO electrolyte can reach 0.581 W cm −2 at 750 °C using humidified hydrogen (3% H2 O) as fuel. Preliminary experiment results suggest that the strategy of composite electrolyte can make up for the shortcomings of doped BaZrO3 and doped-ceria to a certain extent for LT-SOFCs.