Insight of BaCe_0.5Fe_0.5O_3−δ twin perovskite oxide composite for solid oxide electrochemical cells

Abstract

One‐pot synthesized twin perovskite oxide composite of BaCe0.5Fe0.5O3−δ (BCF), comprising cubic and orthorhombic perovskite phases, shows triple‐conducting properties for promising solid oxide electrochemical cells. Phase composition evolution of BCF under various conditions was systematically investigated, revealing that the cubic perovskite phase could be fully/partially reduced into the orthorhombic phase under certain conditions. The reduction happened between the two phases at the interface, leading to the microstructure change. As a result, the corresponding apparent conducting properties also changed due to the difference between predominant conduction properties for each phase. Based on the revealed phase composition, microstructure, and electrochemical properties changes, a deep understanding of BCF's application in different conditions (oxidizing atmospheres, reducing/oxidizing gradients, cathodic conditions, and anodic conditions) was achieved. Triple‐conducting property (H+/O2−/e−), fast open‐circuit voltage response (∼16–∼470 mV) for gradients change, and improved single‐cell performance (∼31% lower polarization resistance at 600°C) were comprehensively demonstrated. Besides, the performance was analyzed under anodic conditions, which showed that the microstructure and phase change significantly affected the anodic behavior.

CuO‐modified LaNi0.4Al0.6O3−δ with improvement performance in MSR at low temperature

“…When large-scale hydrogen production is carried out in industrial production, the environmental impact of CO is relatively reduced. 26 The results show that the sample with the CuO loading of 15 wt% has the best hydrogen production performance. However, the BET characterization results showed that the specific surface area of the 15 wt%CuO/LaNi 0.4 Al 0.6 O 3−δ is not the largest.…”

“…The less selective the CO, the less CO can be produced by this reaction. When large‐scale hydrogen production is carried out in industrial production, the environmental impact of CO is relatively reduced 26 . The results show that the sample with the CuO loading of 15 wt% has the best hydrogen production performance.…”

Nanotechnologies in ceramic electrochemical cells

“…Very interestingly, a twin perovskite with a precursor composition of BaCe 0.5 Fe 0.5 O 3− δ was designed by Zhao et al and successfully used for syntheses of cubic and orthorhombic perovskites, while the cubic perovskite was observed to be reduced into orthorhombic oxide in dry 5 vol% H 2 , which would change their conduction properties. 338 Shi et al reported that through regulating the A-site metal ion ratios of LaSr x Co 1.5 Fe 1.5 O 10− δ ( x = 2.0–3.0), nanocomposites with different weight ratios of R–P and single perovskite (S–P) could be controllably prepared, via a one-pot strategy. 339 A synergy was created between R–P and S–P NPs, generating favorable ORR activity in contrast to bare R–P and S–P oxides.…”

Exploring the potential of triple conducting perovskite cathodes for high-performance solid oxide fuel cells: a comprehensive review

“…However, the performance needs to be improved. 76 Tong et al improved the performance of BCF by adjusting the ratio of Ce and Fe. They synthesized BaCe x Fe 1− x O 3− δ ( x = 0.36, 0.43, and 0.50 denoted as BCF36, BCF43, and BCF50) perovskites and found that BCF36 had the highest PPD.…”