A novel dual phase BaCe0.5Fe0.5O3-δ cathode with high oxygen electrocatalysis activity for intermediate temperature solid oxide fuel cells. (7th June 2019)

• Record Type: Journal Article
• Authors: Zhu, Lin; Hong, Tao; Xu, Chenxi; Cheng, Jigui
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 29(2019)
• Page Start: 15400
• Page End: 15408
• Publication Date: 2019-06-07
• Subjects: Dual phase cathode -- Iron-based perovskite -- Oxygen reduction reaction -- Solid oxide fuel cells; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.04.060
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A novel iron-based perovskite BaCe0.5 Fe0.5 O3-δ (BCF) powders were successfully fabricated and the phase composition, lattice structure, oxygen surface exchange coefficient and electrochemical performance were investigated. The ultrafine BCF powder with grain size of about 200 nm consisted of dual phase BaCe0.15 Fe0.85 O3-δ and BaCe0.85 Fe0.15 O3-δ . Electrical conductivity relaxation measurement illustrates the low conductivity activation energy and the high oxygen surface exchange kinetics with oxygen surface exchange coefficient of 3.8 × 10 −5 cms −1 at 600 °C. BCF cathode exhibits 1.04 Ωcm 2 on doped ceria electrolyte and remains stable in 400 h long term test at 600 °C. A single cell based on doped ceria electrolyte with BCF cathode shows a maximum power density of 228 mW cm −2 at 650 °C. The preliminary results indicate that the dual phase BCF can be applied as cathode material for oxygen ion conductive solid oxide fuel cells. Highlights: A dual-phase BaCe0.5 Fe0.5 O3-δ cathode was successful applied in oxygen ion conductive SOFC. The specific composition and lattice parameter for each phase were investigated. BCF shows high oxygen surface exchange coefficient of 3.8 × 10 −5 cm −1 at 600 °C. It exhibits 1.04 Ωcm 2 on doped ceria electrolyte and remain stable in 400 h at 600 °C.