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

Abstract

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.

Na0.6Co3O4- La/Pr co-Doped Ceria as Semiconductor-Ionic Heterostructure Material for Fuel Cell Application

“…To verify its conduction properties, BZCY was used as an O 2− blocking layer. 22 BZCY is a novel proton conductor with proton conductivity ranging from 0.063 S cm −1 to 0.088 S cm −1 at 400 ∼ 750 °C. 23 Figure 5a shows the cross-sectional scanning electron microscope image of NCAL-Ni/BZCY/8LCP-2NCO/BZCY/NCAL-Ni system unit.…”

Revealing the detrimental CO2 reduction effect of La0.6Sr0.4FeO3-δ-derived heterostructure in solid oxide electrolysis cells

“… 3 , 4 However, the electrolytic efficiency of SOEC is limited by the catalytic activity of the cathode due to the linear nature of CO 2 molecules and high C=O binding energy, so over the years, researchers have conducted many studies on the development of highly active electrode materials for efficient CO 2 activation and reduction. 5 , 6 , 7 In recent years, Ni-based cermet cathodes like Ni-YSZ (nickel-yttrium stabilized zirconia) were first reported because of their high electrical conductivity and superb catalytic activity for CO 2 reduction reaction (CO 2 -RR). 8 , 9 However, it still suffers from a series of problems, such as carbon deposition and grain aggregation, which makes the long-term application of Ni-based cermet materials in SOEC problematic.…”

Novel Anion-Doped Cathode Material SrFe1–xSixO3−δFy for Intermediate-Temperature Solid Oxide Fuel Cells

“…If S is introduced into the Li 4 Ti 5 O 12 electrode material, the electrochemical performance can be improved environmentally and at low cost . Sr 2 Fe 1.5 Mo 0.5 O 5.8 Cl 0.2 still maintains the cubic structure of Fm 3̅ m and reduces the ASR value about 21% compared with Sr 2 Fe 1.5 Mo 0.5 O 6 . The high electronegativity of F can reduce the valence electron density of oxygen, weakening the chemical bond between A/B cations and oxygen.…”

“… 17 Sr 2 Fe 1.5 Mo 0.5 O 5.8 Cl 0.2 still maintains the cubic structure of Fm 3̅ m and reduces the ASR value about 21% compared with Sr 2 Fe 1.5 Mo 0.5 O 6 . 18 The high electronegativity of F can reduce the valence electron density of oxygen, weakening the chemical bond between A/B cations and oxygen. The partial replacement of the ion with the asymmetrical oxidation of O 2– by the F – ion can improve the electrochemical performance of SrFe 1.5 Mo 0.5 O 2.9 F 0.1 .…”