Synthesis and characterisation of BaCeO3-based proton conductors obtained from freeze-dried precursors

Amsif, M.; Marrero-López, D.; Magrasó, Anna; Peña-Martínez, J.; Ruiz-Morales, J.C.; Núñez, P.

doi:10.1016/j.jeurceramsoc.2008.06.001

Cited by 52 publications

(32 citation statements)

References 32 publications

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“…The grains within these rings grow upon annealing. It is observed that both density and grain size enhance with increase of annealing temperature from 700 to 1000°C [29]. SEM image shows highly dense, well connected and compact morphology at 1000°C.…”

Section: Raman Spectroscopy Analysismentioning

confidence: 90%

Investigation on spray deposited BaCe0.7Zr0.1Y0.1Gd0.1O2.9 thin film for proton conducting SOFC

Dubal

Jadhav²,

Bhosale

et al. 2015

J Mater Sci: Mater Electron

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The BaCe 0.8 Y 0.2 O 2.9 (BCY) is co-doped with Zr and Gd with a motive to improve its chemical stability and electrical conductivity. The films are spray deposited on alumina substrate. The films annealed at different temperatures are studied by XRD, XPS, FTIR, Raman and SEM/AFM. The annealing is observed to promote crystallinity, grain growth and densification. The XRD pattern reveals orthorhombic crystal structure. The presence of Ce(IV) and other elements is confirmed by XPS and EDAX, which also assures absence of surface impurities. The most intense band at 355 cm -1 is observed in micro Raman spectrum. The morphology of the film changes with the annealing. AFM reveals grains of 51 nm. The electrical conductivity of BCZYG is measured in air and moist air and it is compared with that of BC, BCY, BCZY and BCGY. Among all, BCZYG shows highest conductivity of 10.02 9 10 -3 S cm -1 in moist-air.

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Section: Raman Spectroscopy Analysismentioning

confidence: 90%

Investigation on spray deposited BaCe0.7Zr0.1Y0.1Gd0.1O2.9 thin film for proton conducting SOFC

Dubal

Jadhav²,

Bhosale

et al. 2015

J Mater Sci: Mater Electron

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“…The conduction mechanism in argon is changed from oxide ion conduction to ptype conduction but the p-type conductivity is less in argon than in air. The activation energies for the conduction calculated by Arrhenius plots are 0.76 and 0.79 eV for argon and air atmosphere, respectively [23][24][25].…”

Section: Edaxmentioning

confidence: 97%

Structural, morphological and electrical studies of BaCe0.8Y0.2O3-δ synthesized by solution combustion method

Jadhav

Dubal

Jamale

et al. 2014

Ionics

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The 20 % yttrium doped barium cerate (BCY20) powder has been synthesized by cost effective solution combustion method. The flame temperature measured by pyrometer was 1055°C, less than the adiabatic temperature due to various losses. The phase formation and evolution was studied with TG-DTA and XRD. The carbonate free orthorhombic BCY20 phase was obtained upon calcination at 900°C. The microstructure of the powders and sintered pellet was examined through scanning electron microscopy. The vibrational mode at 355 cm, characteristics of CeO 6 octahedra, was detected in Raman while the bands corresponding to M-O vibrations were revealed in FT-IR. The dc conductivities of sintered pellet measured in argon and air atmospheres at 600°C were 1.53×10 −3 and 1.41×10 −3 S/cm.

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“…• C, 25,26 although up to one order of magnitude better BCY conductivity values have been presented in few studies. 23 Variation of conductivity in range of one order of magnitude as a function of grain boundary structure of material is a well-known phenomenon and has also been studied in details in the case of BZY.…”

Section: Preparation Of Protective Bazrmentioning

confidence: 98%

Comparative Study of BaY_0.1Zr_0.9O_3-δProtective Layers Deposited to BaY_0.1Ce_0.9O_3-δMembrane Using Ultrasonic Spray Pyrolysis and Magnetron Sputtering Methods

Maide

Korjus

Vestli

et al. 2016

J. Electrochem. Soc.

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To combine chemical stability of BaY 0.1 Zr 0.9 O 3-δ (BZY) and good proton conductive properties of BaY 0.1 Ce 0.9 O 3-δ (BCY) bilayer membranes were prepared. Supportive BCY membranes were prepared applying dry pressing of nanopowder, which was synthesized with ultrasonic spray pyrolysis method. Thin protective BZY coatings were prepared using ultrasonic spray pyrolysis and magnetron sputtering methods. Ultarsonic spray pyrolyzed BZY layers were 0.5-1.1 μm thick, phase pure and with some closed porosity. Protective BZY layers synthesized with reactive magnetron sputtering method were approximately 0.7 μm thick, highly dense and with good phase purity. Activation energy for BCY membrane was 0.35 eV. BZY protective layer sintered at relatively low temperatures (600 to 1150 • C) had minor influence on total activation energy. Sintering at 1350 • C led to a decrease of activation energy of proton transport process at grain boundary region, an increase of activation energy of proton transport in bulk and a slight increase of total activation energy. Sintering at 1350 • C and higher temperatures led to interdiffusion of Zr and Ce cations between BZY and BCY phases and changes in chemical as well as electrochemical properties. Prepared membranes with BZY layer were exposed to CO 2 at 700 • C and were observed to be chemically stable if sintering of BZY were carried out at 1150 • C and lower temperatures. High temperature proton conductive (HTPC) oxide membranes have a variety of applications, such as hydrogen sensors for detecting hydrogen in gases and in melted metals, 1,2 detection systems of hydrocarbons in natural gas, devices for hydrogen extraction and precise pumping, reactors for electrochemical hydrogenation, dehydrogenation and production of ammonia 1-3 etc. Furthermore, these membranes can be used in fuel cells as well as in electrolyzers having some advantages in comparison with oxide ion conductive membranes: a) hydrogen and water are not mixed in fuel cell nor in electrolysis regime and b) higher conductivity and lower activation energy at intermediate temperatures compared with conventional oxide ion conductors.A variety of different chemical compositions has been tested as potential HTPC oxide membrane materials. For example, Ba-, Sr-, Gd-, La-, and Ca -cerates, zirconates, stannates, niobates and titanates, which are doped with Y, In, Gd, Sm, Sc, Ga . [4][5][6][7] In some studies binary oxides with fluoritelike structure and ternary oxides with pyrochloric structure have been studied as well.8 Acceptor doped barium cerate shows the highest protonic conductivities but poor chemical stability. BaCeO 3 and SrCeO 3 are thermodynamically only weakly stabilized and the formation of carbonates takes place in the presence of CO 2 . The stability with respect to the formation of carbonates and hydroxides increases in the order of materials: cerate < zirconate < titanate, i.e., opposite to the direction of the increase of stability of protonic defects and as the B site cation electronegativity increases. Some ...

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Synthesis and characterisation of BaCeO3-based proton conductors obtained from freeze-dried precursors

Cited by 52 publications

References 32 publications

Investigation on spray deposited BaCe0.7Zr0.1Y0.1Gd0.1O2.9 thin film for proton conducting SOFC

Investigation on spray deposited BaCe0.7Zr0.1Y0.1Gd0.1O2.9 thin film for proton conducting SOFC

Structural, morphological and electrical studies of BaCe0.8Y0.2O3-δ synthesized by solution combustion method

Comparative Study of BaY_0.1Zr_0.9O_3-δProtective Layers Deposited to BaY_0.1Ce_0.9O_3-δMembrane Using Ultrasonic Spray Pyrolysis and Magnetron Sputtering Methods

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Synthesis and characterisation of BaCeO3-based proton conductors obtained from freeze-dried precursors

Cited by 52 publications

References 32 publications

Investigation on spray deposited BaCe0.7Zr0.1Y0.1Gd0.1O2.9 thin film for proton conducting SOFC

Investigation on spray deposited BaCe0.7Zr0.1Y0.1Gd0.1O2.9 thin film for proton conducting SOFC

Structural, morphological and electrical studies of BaCe0.8Y0.2O3-δ synthesized by solution combustion method

Comparative Study of BaY0.1Zr0.9O3-δProtective Layers Deposited to BaY0.1Ce0.9O3-δMembrane Using Ultrasonic Spray Pyrolysis and Magnetron Sputtering Methods

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Comparative Study of BaY_0.1Zr_0.9O_3-δProtective Layers Deposited to BaY_0.1Ce_0.9O_3-δMembrane Using Ultrasonic Spray Pyrolysis and Magnetron Sputtering Methods