Thermal evolution of structures and conductivity of Pr-substituted BaZr0.7Ce0.2Y0.1O3−δ: potential cathode components for protonic ceramic fuel cells

Heras-Juaristi, Gemma; Amador, Ulises; Fuentes, Rodolfo O.; Chinelatto, Adilson Luiz; Paz, J. Romero de; Ritter, C.; Fagg, Duncan P.; Pérez-Coll, Domingo; Mather, Glenn C.

doi:10.1039/c7ta09570h

Cited by 15 publications

(21 citation statements)

References 51 publications

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“…Results And Discussion Figure 1 shows the diffraction pattern of BCZP powder under atmospheric air at room temperature. The X-Ray data shows a single phase and it was indexed in the rhombohedral symmetry, R-3c space group, in agreement with previous works on barium cerates and zirconates with Pr content [32][33][34]. Wyckoff positions for Ba, (Ce,Zr,Pr) and O were assigned as 6a, 6b and 18e, respectively.…”

Section: Methodssupporting

confidence: 88%

“…BCZP was studied by HT-XRD under dry synthetic air to determine if such distortions are present in this compound. A phase transition R-3c to Pm-3m occurs between 550 and 575 °C (see Figure 4a), in agreement with phase transitions detected between 400 and 600 ºC in similar compounds [32][33][34]. Figure 4b shows the variation of the pseudocubic lattice parameter with temperature during the heating run.…”

Section: Methodssupporting

confidence: 82%

“…Heras-Juaristi et al and Antunes et al indicate that low Prcontent on barium cerates and zirconates increases the phase transition temperature, and high Pr content induces several phase transitions to lower symmetry structures (Pnma, Imma, etc.) [32][33][34]. The TEM characterization of BCZP powder is complementary to XRD.…”

Section: Methodsmentioning

confidence: 99%

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Synthesis and Characterization of BaCe0.4Zr0.4Pr0.2O3−δ Mixed Conductor Perovskite

Basbus

Arce

Prado

et al. 2020

Preprint

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Abstract Compounds based on barium cerates and zirconates Ba(Ce,Zr)O3−δ are oxides able to transport protons through their crystal lattice by proton hopping between oxygen sites. This feature makes them potential candidates as hydrogen sensors, membranes for hydrogen purification and isotopic exchange, and electrolyte for Proton Conducting Solid Oxide Fuel Cell (PC-SOFC) and Solid Oxide Electrolyzer Cells (PC-SOEC). Pr-doping on these family compounds decreases sintering temperature and introduces electronic conductivity. This work presents a systematic study of the high temperature properties of the BaCe0.4Zr0.4Pr0.2O3−δ (BCZP) perovskite in view of its potential use for these applications. At room temperature, BCZP presents rhombohedral structure, which transforms reversibly to cubic at 550 °C in dry air. Electrochemical measurements under dry air, wet air with water vapor (~ 2% H2O) and heavy water vapor (~ 2% D2O) were employed to describe bulk ionic and electronic transport above 200 °C. The total conductivity data exhibit behavior changes between 400 and 600 °C which could be associated to a crystal structure transition. Below 600 ºC BCZP presents low total conductivity, which limits its applications as single phase cathode material for electrochemical applications. However, the material has good thermomechanical compatibility with electrolytes (~ 11 × 10− 6 K− 1) and high CO2 tolerance (T > 900 ºC). These properties suggest that this compound could be used as oxide support for composite or impregnated electrodes, buffer layer to improve the performance of another cathode material or gas separation co-ionic membranes.

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Section: Methodssupporting

confidence: 88%

Section: Methodssupporting

confidence: 82%

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Synthesis and Characterization of BaCe0.4Zr0.4Pr0.2O3−δ Mixed Conductor Perovskite

Basbus

Arce

Prado

et al. 2020

Preprint

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“…The temperature dependence of the molar magnetic susceptibility of the series was determined with a superconducting quantum interference device magnetometer (Quantum Design, model MPMS-XL). Polycrystalline samples were measured according to the procedure described elsewhere 15 .…”

Section: Methodsmentioning

confidence: 99%

“…High-resolution neutron powder diffraction is most useful in the analysis of the concerted oxygen movements in these tilted perovskites and, in turn, for the precise determination of space group due to the much higher neutron scattering factor of oxygen in comparison to that of X-rays, as has been recently demonstrated for BZCY72 24 and the related Ba stoichiometric solid solution 15 .…”

Section: Phase Formation Phase Fields and Cation Distributionmentioning

confidence: 99%

Structures, Phase Fields, and Mixed Protonic–Electronic Conductivity of Ba-Deficient, Pr-Substituted BaZr_0.7Ce_0.2Y_0.1O_3−δ

et al. 2018

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The BaZr0.7Ce0.2Y0.1O3--BaPrO3- perovskite system, of interest for high-temperature electrochemical applications involving mixed protonic-electronic conductivity, forms a solid solution with a wide interval of Ba substoichiometry in the range Ba(Ce0.2Zr0.7)1-xPrxY0.1O3-, 0 ≤ x ≤ 1. Structural phase transitions mapped as a function of temperature and composition by high-resolution neutron powder diffraction and synchrotron X-ray diffraction reveal higher symmetry for lower Pr content and higher temperatures, with the largest stability field observed for rhombohedral symmetry (space group, 3 ̅). Rietveld refinement, supported by magnetic-susceptibility measurements, indicates that partitioning of the B-site cations over the A and B perovskite sites compensates Ba substoichiometry in preference to A-site vacancy formation and that multiple cations are distributed over both sites. Electron-hole transport dominates electrical conductivity in both wet and dry oxidising conditions, with total conductivity reaching a value of ~ 0.5 S.cm-1 for the x = 1 end-member in dry air at 1173 K. Higher electrical conductivity and the displacement of oxygen loss to higher temperatures with increasing Pr content both reflect the role of Pr in promoting hole formation at the expense of oxygen vacancies. In more reducing conditions (N2) and at low Pr contents, conductivity is higher in humidified atmospheres (~ 0.023 atm pH2O) indicating a protonic contribution to transport, whereas the greater electron-hole conductivity with increasing Pr content results in lower conductivity in humidified N2 due to the creation of protonic defects and the consumption of holes.

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Nickel-doped BaCo0.4Fe0.4Zr0.1Y0.1O3-δ as a new high-performance cathode for both oxygen-ion and proton conducting fuel cells

Liang

Zhou

et al. 2021

Chemical Engineering Journal

133

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Thermal evolution of structures and conductivity of Pr-substituted BaZr_0.7Ce_0.2Y_0.1O_3−δ: potential cathode components for protonic ceramic fuel cells

Abstract: Pr doping in BZCY72 induces symmetry changes and enhances mixed-conductivity for electrochemical applications, with Pr concentration influencing the charge-compensation mechanism.

Cited by 15 publications

References 51 publications

Synthesis and Characterization of BaCe0.4Zr0.4Pr0.2O3−δ Mixed Conductor Perovskite

Synthesis and Characterization of BaCe0.4Zr0.4Pr0.2O3−δ Mixed Conductor Perovskite

Structures, Phase Fields, and Mixed Protonic–Electronic Conductivity of Ba-Deficient, Pr-Substituted BaZr_0.7Ce_0.2Y_0.1O_3−δ

Nickel-doped BaCo0.4Fe0.4Zr0.1Y0.1O3-δ as a new high-performance cathode for both oxygen-ion and proton conducting fuel cells

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Thermal evolution of structures and conductivity of Pr-substituted BaZr0.7Ce0.2Y0.1O3−δ: potential cathode components for protonic ceramic fuel cells

Abstract: Pr doping in BZCY72 induces symmetry changes and enhances mixed-conductivity for electrochemical applications, with Pr concentration influencing the charge-compensation mechanism.

Cited by 15 publications

References 51 publications

Synthesis and Characterization of BaCe0.4Zr0.4Pr0.2O3−δ Mixed Conductor Perovskite

Synthesis and Characterization of BaCe0.4Zr0.4Pr0.2O3−δ Mixed Conductor Perovskite

Structures, Phase Fields, and Mixed Protonic–Electronic Conductivity of Ba-Deficient, Pr-Substituted BaZr0.7Ce0.2Y0.1O3−δ

Nickel-doped BaCo0.4Fe0.4Zr0.1Y0.1O3-δ as a new high-performance cathode for both oxygen-ion and proton conducting fuel cells

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Thermal evolution of structures and conductivity of Pr-substituted BaZr_0.7Ce_0.2Y_0.1O_3−δ: potential cathode components for protonic ceramic fuel cells

Structures, Phase Fields, and Mixed Protonic–Electronic Conductivity of Ba-Deficient, Pr-Substituted BaZr_0.7Ce_0.2Y_0.1O_3−δ