Electrochemical performance of Ln2NiO4+δ (Ln – La, Nd, Pr) And Sr2Fe1.5Mo0.5O6−δ oxide electrodes in contact with apatite-type La10(SiO6)4O3 electrolyte

Antonova, E.P.; Осинкин, Д.А.; Богданович, Н. М.; Gorshkov, M. Yu.; Бронин, Д. И.

doi:10.1016/j.ssi.2018.11.019

Cited by 29 publications

(10 citation statements)

References 49 publications

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“…The synthesis was carried out in two stages at temperatures of 750 • C for 2 h and 1100 • C for 10 h in air. The X-ray powder diffraction (XRD) pattern of SFM powder was shown in our previous paper [32]. X-ray powder diffraction (XRD) and structural analysis were carried out by using the D/MAX-2200 RIGAKU conventional diffractometer in CuKα-radiation (λ(Kα1) = 1.54 Å) at room temperature in ambient air.…”

Section: Methodsmentioning

confidence: 99%

Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

et al. 2020

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The oxygen surface kinetics of Sr2Fe1.5Mo0.5O6−δ was determined using the 16O2/18O2 isotope exchange method with gas phase analysis at 600–800 °C. The heterogeneous exchange rates (rH) and the oxygen diffusion coefficients (D) were calculated by processing the concentration dependences of the 18O fraction using Ezin’s model. The rates of oxygen dissociative adsorption (ra) and incorporation (ri) were calculated based on a model using the three exchange type rates. It has been established that the rates ra and ri were comparable in this temperature range. Assumptions were made about the effect of the chemical composition of the surface on the rate of oxygen adsorption. It was found that the oxygen exchange coefficient (k) of Sr2Fe1.5Mo0.5O6−δ is comparable to that of La0.6Sr0.4MnO3±δ oxide. High values of the oxygen diffusion coefficient were found for Sr2Fe1.5Mo0.5O6−δ. The values were comparable to those of the double cobaltite praseodymium-barium and exceed by more than an order those of lanthanum-strontium manganite.

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Section: Methodsmentioning

confidence: 99%

Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

et al. 2020

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“…It can be seen that, for oxygen electrodes, the functions consist of several processes. The low-frequency step can be assigned to the gas diffusion [25], while the three steps in the middle-frequency region have been recently identified in [44] as oxygen ion diffusion on the electrode/electrolyte interface, charge transfer in the adsorption layer, and oxygen surface exchange and diffusion in the electrode material. Impedance spectra for symmetrical electrochemical cells are depicted in Figure 8A,B.…”

Section: Electrochemical Cells and Performancementioning

confidence: 99%

“…Other promising approaches to improving the performance of SOFCs include the use of high-efficient electrode materials, e.g., La 2 NiO 4+δ , which exhibit enhanced performance at low temperatures due to high oxygen exchange and diffusion coefficient values [25][26][27]; the use of composite electrode materials to extend the electrochemical active zone [28][29][30][31]; and the application of two-layered electrode structures (functional and current collector layers) [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Application of Promising Electrode Materials in Contact with a Thin-Layer ZrO2-Based Supporting Electrolyte for Solid Oxide Fuel Cells

et al. 2020

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The paper presents the results of an investigation into thin single- and triple-layer ZrO2-Sc2O3-based electrolytes prepared using the tape-casting technique in combination with promising electrodes based on La2NiO4+δ and Ni-Ce0.8Sm0.2O2-δ materials. It is shown that pressing and joint sintering of single electrolyte layers allows multilayer structures to be obtained that are free of defects at the layer interface. Electrical conductivity measurements of a triple-layer electrolyte carried out in longitudinal and transverse directions with both direct and alternating current showed resistance of the interface between the layers on the total resistance of the electrolyte to be minimal. Long-term tests have shown that the greatest degradation in resistance over time occurs in the case of an electrolyte with a tetragonal structure. Symmetrical electrochemical cells with electrodes fabricated using a screen-printing method were examined by means of electrochemical impedance spectroscopy. The polarization resistance of the electrodes was 0.45 and 0.16 Ohm∙cm2 at 800 °C for the fuel and oxygen electrodes, respectively. The distribution of relaxation times method was applied for impedance data analysis. During tests of a single solid oxide fuel cell comprising a supporting triple-layer electrolyte having a thickness of 300 microns, a power density of about 160 mW/cm2 at 850 °C was obtained using wet hydrogen as fuel and air as an oxidizing gas.

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“…Depending on the nature of dopant cations and on their amount, the properties of complex oxides based on molybdenum oxide will differ significantly. For example, complex oxide A(MoB) 0.5 O 3 has a high level of mixed conductivity and can be used as cathodes , and anodes − for SOFCs. On the other hand, the introduction of rare earth metals, such as lanthanum (LAMOX), leads to the formation of the La 2 Mo 2 O 9 phase, which has a purely oxygen-ionic conductivity and can be used as an electrolyte in SOFCs. , La 2 Mo 2 O 9 has a high oxygen-ion conductivity, the value of which at 800 °C is comparable with that of a zirconium yttrium electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Promising La₂Mo₂O₉–La₂Mo₃O₁₂ Composite Oxygen-Ionic Electrolytes: Interphase Phenomena

Поротникова

Khrustov

Фарленков

et al. 2022

ACS Appl. Mater. Interfaces

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The La2Mo2O9–La2Mo3O12 composite materials represent a novel class of highly conductive materials demonstrating increased oxygen-ion conductivity. Extensive research of (100 – x)La2Mo2O9–xLa2Mo3O12 composites over a wide range of concentrations (x = 5, 10, 15, 20, 30, and 100) was carried out for the first time. An increase in conductivity, oxygen surface exchange coefficient, and oxygen diffusivity is observed for composites compared to individual oxides, which is associated with the segregation of different ions on the surface of the grains and the formation of a La5Mo3O16 new phase at the contact boundary of La2Mo2O9 and La2Mo3O12. 3D-modeling of the composite microstructure was performed on the basis of SEM-image analysis data in order to estimate the conductivity of the interphase layer between the La2Mo2O9 and La2Mo3O12 grains containing La5Mo3O16. The electrical conductivity values of the composite materials calculated from a 3D-simulated microstructure and the experimentally measured conductivity correlate and demonstrate a composite effect.

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Electrochemical performance of Ln2NiO4+δ (Ln – La, Nd, Pr) And Sr2Fe1.5Mo0.5O6−δ oxide electrodes in contact with apatite-type La10(SiO6)4O3 electrolyte

Cited by 29 publications

References 49 publications

Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

Application of Promising Electrode Materials in Contact with a Thin-Layer ZrO2-Based Supporting Electrolyte for Solid Oxide Fuel Cells

Promising La₂Mo₂O₉–La₂Mo₃O₁₂ Composite Oxygen-Ionic Electrolytes: Interphase Phenomena

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Electrochemical performance of Ln2NiO4+δ (Ln – La, Nd, Pr) And Sr2Fe1.5Mo0.5O6−δ oxide electrodes in contact with apatite-type La10(SiO6)4O3 electrolyte

Cited by 29 publications

References 49 publications

Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

Application of Promising Electrode Materials in Contact with a Thin-Layer ZrO2-Based Supporting Electrolyte for Solid Oxide Fuel Cells

Promising La2Mo2O9–La2Mo3O12 Composite Oxygen-Ionic Electrolytes: Interphase Phenomena

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Promising La₂Mo₂O₉–La₂Mo₃O₁₂ Composite Oxygen-Ionic Electrolytes: Interphase Phenomena