Multifactor theoretical study on ionic transport numbers of mixed oxygen ionic-electronic conducting oxides determined by the electromotive force method

Mo, Yingyu; Huang, Yue; Lian, Wenchao; Qiu, Ruiming; Tian, Zhipeng; Liu, Jianping; Wang, Chao; Chen, Ying; Zhang, Jihao; Lei, Libin

doi:10.1016/j.jpowsour.2022.232291

Cited by 5 publications

(3 citation statements)

References 34 publications

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“…20% because it strongly depends on the electrode polarization resistance, as well as on the conductivity properties of the materials. 45,46 Therefore, it shows the trends in changes in transport numbers that should be assessed.…”

Section: Electromotive Force (Emf) Methodsmentioning

confidence: 99%

Extensive research of conductivity in the fluorite-like KLn₄Mo₃O₁₅F (Ln = La, Pr, Nd) rare earth molybdates: theoretical and experimental data

Orlova,

Morkhova,

Egorova

et al. 2024

Phys. Chem. Chem. Phys.

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Section: Electromotive Force (Emf) Methodsmentioning

confidence: 99%

Extensive research of conductivity in the fluorite-like KLn₄Mo₃O₁₅F (Ln = La, Pr, Nd) rare earth molybdates: theoretical and experimental data

Orlova,

Morkhova,

Egorova

et al. 2024

Phys. Chem. Chem. Phys.

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“…Experimental procedure of electromotive force method.-Ionic transport numbers were measured by the EMF method in a concentration cell in the temperature range of 400 °C to 800 °C for pure MNO, CNO, ZNO. 33,34 Oxygen transport numbers were determined by the pO 2 gradient, for which the pressure of atmospheric air (pO 2 = 0.21 atm) was compared with the pressure of supplied oxygen (pO 2 = 1 atm). The measurement samples were pellets similar to those used to measure electrical conductivity by impedance spectroscopy.…”

Section: Methodsmentioning

confidence: 99%

“…It is worth considering that the error of the EMF method reaches 20% since it depends sensitively on the electrode polarization resistance as well as the conduction properties of the studied materials. 34,47 Experimental electrical properties for MNT x O and CNT x O (x = 0.1, 0.2).-Impedance spectra for MNT x O and CNT x O are fitted by R-CPE equivalent circuit as their matrices (Figs. S8-S9).…”

Section: Compoundmentioning

confidence: 99%

Exhaustive Study of Electrical Conductivity in the MNb_2−xTixO_6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Morkhova,

Koroleva,

Egorova

et al. 2024

ECS Adv.

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The CaNb2O6 and ZnNb2O6 columbites (Sp.gr. Pbcn) were studied as oxygen ion conductors both theoretically and experimentally. A theoretical approach included geometrical-topological analysis, bond valence site energy (BVSE) and density functional theory (DFT) calculations. The BVSE approach showed the possibility of pure oxygen ions diffusion with migration energies less than 0.45 eV in both compounds. However, DFT calculations indicated the possibility of diffusion of both anions and cations. The single-phases columbites were synthesized by the Pechini method for accurately determine charge carriers type and investigated by impedance spectroscopy, by the Tubandt method, which confirmed the absence of cationic conductivity, and measured the electrical conductivity as a function of oxygen partial pressures. The CaNb2O6 sample had the pure oxygen-ionic conductivity ∼2×10-6 S cm–1 at 800 °C (Ea = 0.82 eV), while the ZnNb2O6 had a similar conductivity value due to mixed ionic-electronic contribution (Ea = 0.83 eV). The electromotive force method also showed the predominance of the ionic type of conductivity in CaNb2O6, while ZnNb2O6 has a mixed conductivity with ion transport number of about 0.4. Additionally, we synthesized Ti-doped samples MNb2-xTixO6-0.5x (M = Mg, Ca; x = 0.1, 0.2) to study the doping effect on conducting properties.

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Evaluating high power density, direct-ammonia SOFC stacks for decarbonizing heavy-duty transportation applications

Wehrle,

Ashar,

Deutschmann

et al. 2024

Applied Energy

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Multifactor theoretical study on ionic transport numbers of mixed oxygen ionic-electronic conducting oxides determined by the electromotive force method

Cited by 5 publications

References 34 publications

Extensive research of conductivity in the fluorite-like KLn₄Mo₃O₁₅F (Ln = La, Pr, Nd) rare earth molybdates: theoretical and experimental data

Extensive research of conductivity in the fluorite-like KLn₄Mo₃O₁₅F (Ln = La, Pr, Nd) rare earth molybdates: theoretical and experimental data

Exhaustive Study of Electrical Conductivity in the MNb_2−xTixO_6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Evaluating high power density, direct-ammonia SOFC stacks for decarbonizing heavy-duty transportation applications

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Multifactor theoretical study on ionic transport numbers of mixed oxygen ionic-electronic conducting oxides determined by the electromotive force method

Cited by 5 publications

References 34 publications

Extensive research of conductivity in the fluorite-like KLn4Mo3O15F (Ln = La, Pr, Nd) rare earth molybdates: theoretical and experimental data

Extensive research of conductivity in the fluorite-like KLn4Mo3O15F (Ln = La, Pr, Nd) rare earth molybdates: theoretical and experimental data

Exhaustive Study of Electrical Conductivity in the MNb2−x TixO6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Evaluating high power density, direct-ammonia SOFC stacks for decarbonizing heavy-duty transportation applications

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Extensive research of conductivity in the fluorite-like KLn₄Mo₃O₁₅F (Ln = La, Pr, Nd) rare earth molybdates: theoretical and experimental data

Extensive research of conductivity in the fluorite-like KLn₄Mo₃O₁₅F (Ln = La, Pr, Nd) rare earth molybdates: theoretical and experimental data

Exhaustive Study of Electrical Conductivity in the MNb_2−xTixO_6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites