LaScO3-based electrolyte for protonic ceramic fuel cells: Influence of sintering additives on the transport properties and electrochemical performance

Кузьмин, А. В.; Lesnichyova, A.S.; Tropin, E. S.; Stroeva, А. Yu.; Vorotnikov, V. A.; Solodyankina, D.M.; Belyakov, S. A.; Плеханов, М. С.; Фарленков, А. С.; Осинкин, Д.А.; Береснев, С. М.; Ananyev, M.V.

doi:10.1016/j.jpowsour.2020.228255

Cited by 40 publications

(21 citation statements)

References 56 publications

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“…To compare the R P changes of the three samples more intuitively, we made the Arrhenius curve of R P and temperature, as shown in Figure 6F. As shown in the figure, the activation energy of PSFN 113-214 heterocomposite cathode was greater than PSFN 113 (74.65 kJ mol −1 ) and PSFN 214 (74.16 kJ mol −1 ), indicating that the catalytic activity of the composite oxide was more sensitive to temperature (Li et al, 2017;Kuzmin et al, 2020), but still much smaller than La 0.5 Sr 0.5 CoO 3−δ -LaSrCoO 4±δ (121.25 kJ mol −1 ) (Li et al, 2020), (PrSr)Ni 0.5 Mn 0.5 O 3−δ -PrO x -(PrSr) 2 (MnNi) O 4−δ (147.5 kJ mol −1 ) (Wang et al, 2020). Therefore, PSFN 113-214 (5: 5) has the potential as a SOFC cathode material.…”

Section: Electrochemical Impedance Spectroscopy Spectramentioning

confidence: 99%

Heterointerface Effect in Accelerating the Cathodic Oxygen Reduction for Intermediate-Temperature Solid Oxide Fuel Cells

Zhu

Meng

et al. 2022

Front. Chem.

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A solid-state mixing method was adopted to prepare a new Pr0.8Sr0.2Fe0.7Ni0.3O3−δ-Pr1.2Sr0.8Fe0.4Ni0.6O4+δ (PSFN113-214) composite cathode oxide for the solid oxide fuel cells (SOFCs). Herein, heterointerface engineering was investigated for the performance enhancement. It was found that the oxygen vacancy content could be increased by mixing the PSFN214 with PSFN113, which gave rise to the formation of a heterostructure, and resulted in the promotion of oxygen ion transport as well as the specific surface area. The optimum mixing ratio 5:5 resulted in the highest oxygen vacancy content and the largest specific surface area, indicating the strongest interface effect. Polarization resistance of PSFN113-214 (5:5) was 0.029 Ω cm2 at 800°C, which was merely 24% of PSFN113 and 39% of PSFN214. The corresponding maximum power density was 0.699 W cm−2, which was nearly 1.44 times of PSFN113 and 1.24 times of PSFN214. Furthermore, the voltage attenuation rate after 100 h was merely 0.0352% h−1. Therefore, the new PSFN113-214 composite could be a prospective cathode oxide for SOFCs.

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Section: Electrochemical Impedance Spectroscopy Spectramentioning

confidence: 99%

Heterointerface Effect in Accelerating the Cathodic Oxygen Reduction for Intermediate-Temperature Solid Oxide Fuel Cells

Zhu

Meng

et al. 2022

Front. Chem.

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“…Proton-conducting oxides are intensively studied for application in renewable and green energy as essential parts of protonic-ceramic fuel cells (PCFCs), electrolyzers (PCEs) for hydrogen generation, or membrane reactors. − Variously doped oxides based on LaScO 3 were investigated, featuring competitive conductivity compared to the conductivity of other proton-conducting oxides as well as good chemical and thermal stability with the most promising composition being La 0.9 Sr 0.1 ScO 3−δ . − …”

Section: Introductionmentioning

confidence: 99%

Correlating Proton Diffusion in Perovskite Triple-Conducting Oxides with Local and Defect Structure

et al. 2022

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Triple-conducting oxides are considered to be nextgeneration materials for renewable and green energy as parts of fuel cells, electrolyzers, and membrane reactors. The electrochemical properties of any material are tightly correlated with its structural features. Because all ionic transport in oxides is related to point defects, it is crucial to understand their location and surroundings. In this work, we use total X-ray and neutron scattering to investigate how the introduction of Co into a proton-conducting oxide La 0.9 Sr 0.1 Sc 1−x Co x O 3−δ influences the local structural disorder and location of protons. Using non-constant force field molecular dynamics, we investigate the proton trapping effect and point out a way of avoiding it. Under an applied voltage, we observe proton diffusion anisotropy, which significantly improves the proton conductivity of oxide membranes. We show that the introduction of cobalt into a proton-conducting oxide can increase the number of incorporated protons compared to previous expectations. This, coupled with the absence of proton trapping and proton conductivity anisotropy, means that the potential of A 3+ B 3+ O 3 perovskites could be much greater than considered so far. Our computational results will improve our understanding of the features of proton transport by updating the model of proton conductivity in triple-conducting oxides.

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“…The well-studied orthorhombic-doped perovskite LaScO 3 exhibits high oxygen-ionic and proton conductivities. This complex oxide has been successfully doped into various sublattices [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. In a dry atmosphere, acceptor-doped LaScO 3 is a mixed oxygen ion and hole conductor.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure, Electrical Conductivity and Hydration of the Novel Oxygen-Deficient Perovskite La2ScZnO5.5, Doped with MgO and CaO

et al. 2022

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This paper demonstrates the possibility of creating oxygen deficiency in perovskites A+3B+3O3 by introducing two types of cations with different charges into the B-sublattice. For this, it is proposed to introduce a two-charged cation, for example, Zn2+, as an alternative to alkaline earth metals. Previously, this possibility was demonstrated for aluminate LaAlO3 and indate LaInO3. In this article, we have focused on the modification of the scandium-containing perovskite LaScO3. The novel oxygen-deficient perovskite La2ScZnO5.5 and doped phases La1.9Ca0.1ScZnO5.45, La2Sc0.9Ca0.1ZnO5.45, and La2Sc0.9Mg0.1ZnO5.45 were obtained via a solid-state reaction process. Their phase composition and hydration were investigated by XRD and TGA + MS techniques. The conductivities of these materials were measured by the electrochemical impedance technique under atmospheres of various water vapor partial pressures. All phases crystallized in orthorhombic symmetry with the Pnma space group. The phases were capable of reversible water uptake; the proton concentration increased in the order of La2ScZnO5.5 < La2Sc0.9Mg0.1ZnO5.45 < La2Sc0.9Ca0.1ZnO5.45 ≈ La1.9Ca0.1ScZnO5.45 and reached ~90% hydration limit for Ca2+-doped phases. The total conductivities increased with the increase in the free lattice volume in the sequence of σLa2ScZnO5.5 < σLa2Sc0.9Mg0.1ZnO5.45 < σLa1.9Ca0.1ScZnO5.45 < σLa2Sc0.9Ca0.1ZnO5.45, the activation energy decreased in the same sequence. The sample La2Sc0.9Ca0.1ZnO5.45 showed the highest conductivity of about 10−3 S∙cm−1 at 650 °C (dry air pH2O = 3.5·10−5 atm). Water incorporation was accompanied by an increase in conductivity in wet air (pH2O = 2·10−2 atm) due to the appearance of proton conductivity. The sample La2Sc0.9Ca0.1ZnO5.45 showed a conductivity of about 10−5 S∙cm−1 at 350 °C (pH2O = 2·10−2 atm). A comparison of conductivities of obtained phase La2ScZnO5.5 with the conductivities of La2AlZnO5.5 and La2InZnO5.5 was made; the nature of the B-cation did not significantly affect the total conductivity.

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LaScO3-based electrolyte for protonic ceramic fuel cells: Influence of sintering additives on the transport properties and electrochemical performance

Cited by 40 publications

References 56 publications

Heterointerface Effect in Accelerating the Cathodic Oxygen Reduction for Intermediate-Temperature Solid Oxide Fuel Cells

Heterointerface Effect in Accelerating the Cathodic Oxygen Reduction for Intermediate-Temperature Solid Oxide Fuel Cells

Correlating Proton Diffusion in Perovskite Triple-Conducting Oxides with Local and Defect Structure

Crystal Structure, Electrical Conductivity and Hydration of the Novel Oxygen-Deficient Perovskite La2ScZnO5.5, Doped with MgO and CaO

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