Oxygen storage capacity of Sr3Fe2O7−δ having high structural stability

Beppu, Kosuke; Hosokawa, Saburo; Teramura, Kentaro; Tanaka, Tsunehiro

doi:10.1039/c5ta01588j

Cited by 50 publications

(61 citation statements)

References 30 publications

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“…New cathodes with mixed conductivity based on simple perovskite (doped LaCoO 3 , BaCoO 3 , and LaFeO 3 ) have been extensively studied [8][9][10][11][12][13]. Considering high oxygen-ion defect concentration, oxygen diffusion anisotropy, and cation ordered-structure, several recent studies have highlighted the promising of the Ruddlesden-Popper (RP) series, A n+1 BnO 3n+1 , for cathode application, where the special sandwich structure consists of n ABO 3 perovskite and two AO rock salt layers [14][15][16][17][18][19]. The Sr 3 Fe 2 O 7-δ -based systems, belonging to the n = 2 series, have been widely investigated owing to their high oxygen deficiency, excellent water-intercalation property, and prominent catalytic activity [20][21][22].…”

Section: Introduction mentioning

confidence: 99%

New two-layer Ruddlesden—Popper cathode materials for protonic ceramics fuel cells

Ling

Guo

et al. 2021

J Adv Ceram

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New two-layer Ruddlesden—Popper (RP) oxide La0.25Sr2.75FeNiO7−δ (LSFN) in the combination of Sr3Fe2O7−δ and La3Ni2O7−δ was successfully synthesized and studied as the potential active single-phase and composite cathode for protonic ceramics fuel cells (PCFCs). LSFN with the tetragonal symmetrical structure (I4/mmm) is confirmed, and the co-existence of Fe3+/Fe4+ and Ni3+/Ni2+ couples is demonstrated by X-ray photoelectron spectrometer (XPS) analysis. The LSFN conductivity is apparently enhanced after Ni doping in Fe-site, and nearly three times those of Sr3Fe2O7−δ, which is directly related to the carrier concentration and conductor mechanism. Importantly, anode supported PCFCs using LSFN-BaZr0.1Ce0.7Y0.2O3−δ (LSFN-BZCY) composite cathode achieved high power density (426 mW·cm−2 at 650 °C) and low electrode interface polarization resistance (0.26 Ω·cm2). Besides, distribution of relaxation time (DRT) function technology was further used to analyse the electrode polarization processes. The observed three peaks (P1, P2, and P3) separated by DRT shifted to the high frequency region with the decreasing temperature, suggesting that the charge transfer at the electrode-electrolyte interfaces becomes more difficult at reduced temperatures. Preliminary results demonstrate that new two-layer RP phase LSFN can be a promising cathode candidate for PCFCs.

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Section: Introduction mentioning

confidence: 99%

New two-layer Ruddlesden—Popper cathode materials for protonic ceramics fuel cells

Ling

Guo

et al. 2021

J Adv Ceram

View full text Add to dashboard Cite

show abstract

“…New cathodes with mixed conductivity based on simple perovskite (doped LaCoO 3 , BaCoO 3 and LaFeO 3 ) have been extensively studied [7][8][9][10][11][12]. Considering high oxygen-ion defect concentration, oxygen diffusion anisotropy and cation ordered-structure, several recent studies have highlighted the promising of the Ruddlesden-Popper (RP) series, A n+1 BnO 3n + 1 , for cathode application, where the special sandwich structure consists of n ABO 3 perovskite and two AO rock salt layers [13][14][15][16][17]. The Sr 3 Fe 2 O 7−δ -based systems, belonging to the n = 2 series, have been widely investigated owing to their high oxygen de ciency, excellent water-intercalation property and prominent catalytic activity [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

New Two-layer Ruddlesden-popper Cathode Materials for Protonic Ceramics Fuel Cells

Ling

Guo

et al. 2021

Preprint

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New two-layer Ruddlesden-popper (RP) oxide La0.25Sr2.75FeNiO7-δ (LSFN) in the combination of Sr3Fe2O7-δ and La3Ni2O7-δ was successfully synthesized and studied as the potential active single-phase and composite cathode for protonic ceramics fuel cells (PCFCs). LSFN with the tetragonal symmetrical structure (I4/mmm) is confirmed, and the co-existence of Fe3+ /Fe4+ and Ni3+/Ni2+ couples is demonstrated by XPS analysis. The LSFN conductivity is apparently enhanced after Ni doping in Fe-site, and nearly three times those of Sr3Fe2O7-δ, which is directly related to the carrier concentration and conductor mechanism. Importantly, anode supported PCFCs using LSFN-BZCY composite cathode achieved high power density (426 mW·cm-2 at 650°C) and low electrode interface polarization resistance (0.26 Ω cm2). Besides, relaxation time distribution function (DRT) technology was further used to analysis the electrode polarization processes. The observed three peaks (P1, P2, P3) separated by DRT shifted to the high frequency region with the decreasing temperature, suggesting that the charge transfer at the electrode-electrolyte interfaces become more difficult at reduced temperature. Preliminary results demonstrate new two-layer PR phase LSFN can be a promising cathode candidate for PCFCs.

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“…Mixed ionic and electronic conductor (MIEC) materials are generally considered to be promising cathode candidates for solid oxide fuel cells (SOFCs) [1,2]. Among several MIEC oxides, Ruddlesden−Popper (R-P) materials have aroused attention due to their high electronic conductivity and favorable stability [3,4]. The R-P oxidizes with the general structural formula of A n+1 B n O 3n +1 (A = alkaline earth and/or rare earth elements, B = transition metal), where perovskite slabs are sandwiched between rock-salt layers [5,6].…”

Section: Introductionmentioning

confidence: 99%

An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr3Fe2O7−δ Electrodes for Solid Oxide Fuel Cells

Peng

Sun

et al. 2021

Catalysts

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The target of this work is to develop advanced electrode materials with excellent performance compared to conventional cathodes. Cobalt-free Ruddlesden−Popper oxides Sr3Fe2−xCuxO7−δ (SFCx, x = 0, 0.1, 0.2) were successfully synthesized and assessed as cathode materials for solid oxide fuel cells (SOFCs). Herein, a Cu-doping strategy is shown to increase the electrical conductivity and improve the electrochemical performance of the pristine Sr3Fe2O7−δ. Among all the cathode materials, the Sr3Fe1.9Cu0.1O7−δ (SFC10) cathode exhibits the best electrocatalytic activity for oxygen reduction reaction (ORR). The polarization resistance is 0.11 Ω cm2 and the peak power density of the single-cell with an SFC10 cathode reaches 955 mW cm−2 at 700 °C, a measurement comparable to cobalt-based electrodes. The excellent performance is owed to favorable oxygen surface exchange capabilities and larger oxygen vacancy concentrations at elevated temperatures. Moreover, the electrochemical impedance spectra and distribution of relaxation time results indicate that the charge transfer process at the triple-phase boundary is the rate-limiting step for ORR on the electrode. This work provides an effective strategy for designing novel cathode electrocatalysts for SOFCs.

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Oxygen storage capacity of Sr₃Fe₂O_7−δ having high structural stability

Abstract: Sr3Fe2O7−δ has not only high structural stability under severe reduction conditions, but also high oxygen storage capacity due to topotactic oxygen intake/release.

Cited by 50 publications

References 30 publications

New two-layer Ruddlesden—Popper cathode materials for protonic ceramics fuel cells

New two-layer Ruddlesden—Popper cathode materials for protonic ceramics fuel cells

New Two-layer Ruddlesden-popper Cathode Materials for Protonic Ceramics Fuel Cells

An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr3Fe2O7−δ Electrodes for Solid Oxide Fuel Cells

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