Enhancing oxygen reduction activity and CO2-tolerance of A-site-deficient BaCo0.7Fe0.3O3-δ cathode by surface-decoration with Pr6O11 particles. (6th November 2020)

• Record Type: Journal Article
• Authors: Li, Jun; Zhao, Xinyu; Min, Huihua; Lu, Yi; Li, Mingze; Ding, Xifeng
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 55(2020)
• Page Start: 31070
• Page End: 31079
• Publication Date: 2020-11-06
• Subjects: Solid oxide fuel cells (SOFCs) -- Oxygen reduction reaction -- CO2-tolerance -- Composite cathode -- Surface-decoration; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.08.147
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Sluggish oxygen reduction reaction (ORR) activity and poor CO2 -tolerance has been the long-standing limitations for the application of alkaline earth metal oxide cathode for solid oxide fuel cells (SOFCs). Here we report this situation can be ameliorated with a composite cathode based on Ba0.9 Co0.7 Fe0.3 O3-δ (B90CF) by surface-decorated Pr6 O11 (PO) particles. A halved polarization resistance is obtained by B90CF-15PO (PO of 15 wt%) cathode (0.033 Ω cm 2 at 700 °C) compared to blank B90CF, suggesting boosted oxygen reduction reaction activity owing to the accelerated oxygen surface exchange kinetics introduced by PO particles. PO protective layer also brings up desirable CO2 -tolerance for B90CF cathode due to the more stable fluorite cubic structure of PO and higher acidity of Pr 3+ /Pr 4+ than Ba 2+, which ensures the stable operation of cells. This work demonstrates the positive potential of surface-decoration with PO in developing cathodes with high performance and CO2 -tolerance. Highlights: B90CF-15PO cathode exhibits boosted ORR activity compared to B90CF. Oxygen surface exchange kinetics of B90CF-15PO cathode is highly accelerated. CO2 -tolerance of B90CF-15PO is effectively enhanced with the protection of PO layer.