A-site deficient Fe-based double perovskite oxides PrxBaFe2O5+δ as cathodes for solid oxide fuel cells

Lü, Shiquan; Zhu, Yanzhuo; Fu, Xinmin; Huang, Rui; Guo, Yanqing; Zhang, Wenxing; Li, Hongliang; Hou, Lujin; Meng, Xiuxia

doi:10.1016/j.jallcom.2022.165002

Cited by 27 publications

(5 citation statements)

References 48 publications

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“…Moreover, a literature analysis demonstrates that simple synthesis in air can also result in the formation of PrBaFe 2 O 6−δ with different lattice symmetry. Besides the cubic structure [15,17,20], a tetragonal one with a P4/mmm space group [14,21], and orthorhombic one with Pmmm [22,23] are also reported for this composition prepared in air. A comparison of the synthesis conditions used in the above mentioned studies demonstrates that the oxides with low symmetry were obtained at relatively low temperatures-950 or 1000 • C [14,[21][22][23], whereas synthesis at 1330 or 1350 • C provides the formation of PrBaFe 2 O 6−δ with a cubic structure [15,17,20].…”

Section: Introductionmentioning

confidence: 73%

“…Besides the cubic structure [15,17,20], a tetragonal one with a P4/mmm space group [14,21], and orthorhombic one with Pmmm [22,23] are also reported for this composition prepared in air. A comparison of the synthesis conditions used in the above mentioned studies demonstrates that the oxides with low symmetry were obtained at relatively low temperatures-950 or 1000 • C [14,[21][22][23], whereas synthesis at 1330 or 1350 • C provides the formation of PrBaFe 2 O 6−δ with a cubic structure [15,17,20]. This feature shows that although Pr 3+ and Ba 2+ cations in ferrites tend to be ordered due to a considerable size difference, synthesis at high temperature ensures the formation of a substantially disordered state in the A sublattice.…”

Section: Introductionmentioning

confidence: 73%

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Structural Features and Defect Equilibrium in Cubic PrBa1−xSrxFe2O6−δ

et al. 2022

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The structure, oxygen non-stoichiometry, and defect equilibrium in perovskite-type PrBa1−xSrxFe2O6−δ (x = 0, 0.25, 0.50) synthesized at 1350 °C were studied. For all compositions, X-ray diffraction testifies to the formation of a cubic structure (S.G. Pm3¯m), but an electron diffraction study reveals additional diffuse satellites around each Bragg spot, indicating the primary incommensurate modulation with wave vectors about ±0.43a*. The results were interpreted as a sign of the short-order in both A-cation and anion sublattices in the areas of a few nanometers in size, and of an intermediate state before the formation of an ordered superstructure. An increase in oxygen deficiency was found to promote the ordering, whereas partial substitution of barium by strontium caused the opposite effect. The oxygen content in oxides as a function of oxygen partial pressure and temperature was measured by coulometric titration, and the data were used for the modeling of defect equilibrium in oxides. The simulation results implied oxygen vacancy ordering in PrBa1−xSrxFe2O6−δ that is in agreement with the electron diffraction study. Besides oxidation and charge disproportionation reactions, the reactions of oxygen vacancy distribution between non-equivalent anion positions, and their trapping in clusters with Pr3+ ions were taken into account by the model. It was demonstrated that an increase in the strontium content in Pr0.5Ba0.5−xSrxFeO3−δ suppressed ordering of oxygen vacancies, increased the binding energy of oxygen ions in the oxides, and resulted in an increase in the concentration of p-type carriers.

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Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 73%

Structural Features and Defect Equilibrium in Cubic PrBa1−xSrxFe2O6−δ

et al. 2022

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“…On the other end, the progressively increased size difference between Ln 3+ and Ba 3+ due to lanthanide contraction prevents SBF and GdBaFe 2 O 5 (GBF) from forming cubic structures; instead, they have a less symmetrical tetragonal crystal structure, where atoms are arranged in an ordered layer structure, as depicted in Figure 4D. For PrBaFe 2 O 5 (PBF) and NdBaFe 2 O 5 , they could be formed into cubic phases [110][111][112][113][114] or tetragonal phases [110,[115][116][117] , depending on variations in the synthesis methods. From an electron conduction point of view, linear O-Fe-O bonds (i.e., bonding angle of 180°) in cubic LaBaFe 2 O 5 are most conducive to electron conduction and are largely attributed to the relatively high DC conductivity observed in LaBaFe 2 O 5 [118,119] .…”

Section: Characteristics Of Lnbafe 2 O 5 Materialsmentioning

confidence: 99%

Review on Fe-based double perovskite cathode materials for solid oxide fuel cells

Xie,

Cai,

Duan

et al. 2024

Energy Mater

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As a clean and efficient energy conversion device, solid oxide fuel cells have been garnering attention due to their environmentally friendly and fuel adaptability. Consequently, they have become one of the current research directions of new energy. The cathode, as the electrochemical reaction site of an oxidation atmosphere in solid oxide fuel cells, plays a key role in determining the output performance. In recent years, the development of double perovskite cathode materials with mixed ionic and electronic conductors has made significant progress in intermediate-temperature (600-800 °C) fuel cells. These materials have the potential to deliver higher power densities and improved stability, making them promising candidates for future fuel cell applications. The Fe-based double perovskite structure cathode material has gained extensive attention due to its adjustable crystal structure and performance, as it has A(A’) or B(B’) positions in its AA’BB’O6 structure. This material has several advantages, such as high oxygen catalytic activity, low thermal expansion coefficient, and compatibility with the thermal expansion of the electrolyte. An increasing number of researchers have been exploring the performance reaction mechanism of double perovskite by modifying and adjusting its material microstructure, crystal structure, and electronic structure. In this paper, the research progress of LnBaFe2O5 and Sr2Fe2-xMoxO6 double perovskite cathode materials is reviewed to highlight the effects of various modification methods developed on electrochemical performance of these materials. Furthermore, the potential future research directions of double perovskite cathode materials are prospected.

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“…[119]. Extensive investigations have been undertaken to understand the effects of Ba 2+ [93][94][95][96][97]120,121] and Ln 3+ [122][123][124][125] deficiencies on the crystal structure, oxygen content, electrical conductivity, and electrochemical performance of double perovskite LnBaCo2O5+δ. Pang et al [94,95] observed that with an increase in Ba deficiency from x = 0.00 (0.181 Ω cm 2 ) to x = 0.08 (0.093 Ω cm 2 ) at 600 °C, the ASR value of PrBa1-xCo2O5+δ drops by approximately 50%.…”

Section: Compositional Optimization Of Lnbaco 2 O 5+δmentioning

confidence: 99%

Progress in Developing LnBaCo2O5+δ as an Oxygen Reduction Catalyst for Solid Oxide Fuel Cells

Zheng,

Pang

2023

Catalysts

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Solid oxide fuel cells (SOFCs) represent a breed of eco-friendly, weather-independent, decentralized power generation technologies, distinguished for their broad fuel versatility and superior electricity generation efficiency. At present, SOFCs are impeded by a lack of highly efficient oxygen reduction catalysts, a factor that significantly constrains their performance. The double perovskites LnBaCo2O5+δ (Ln = Lanthanide), renowned for their accelerated oxygen exchange and conductivity features, are widely acclaimed as a promising category of cathode catalysts for SOFCs. This manuscript offers a novel perspective on the physicochemical attributes of LnBaCo2O5+δ accumulated over the past two decades and delineates the latest advancements in fine-tuning the composition and nanostructure for SOFC applications. It highlights surface chemistry under operational conditions and microstructure as emerging research focal points towards achieving high-performance LnBaCo2O5+δ catalysts. This review offers a comprehensive insight into the latest advancements in utilizing LnBaCo2O5+δ in the field of SOFCs, presenting a clear roadmap for future developmental trajectories. Furthermore, it provides valuable insights for the application of double perovskite materials in domains such as water electrolysis, CO2 electrolysis, chemical sensors, and metal–air batteries.

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A-site deficient Fe-based double perovskite oxides PrxBaFe2O5+δ as cathodes for solid oxide fuel cells

Cited by 27 publications

References 48 publications

Structural Features and Defect Equilibrium in Cubic PrBa1−xSrxFe2O6−δ

Structural Features and Defect Equilibrium in Cubic PrBa1−xSrxFe2O6−δ

Review on Fe-based double perovskite cathode materials for solid oxide fuel cells

Progress in Developing LnBaCo2O5+δ as an Oxygen Reduction Catalyst for Solid Oxide Fuel Cells

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