Recent progress of barium zirconate proton conductor in electrochemical hydrogen devices: A review

2021 ◽  
Author(s):  
M. Khalid Hossain ◽  
Rajesh Chanda ◽  
Adel El-Denglawey ◽  
Tanvir Emrose ◽  
M. Tayebur Rahman ◽  
...  
Keyword(s):  
Recent Progress ◽  
Proton Conductor ◽  
Barium Zirconate

Characterization of Yttrium-Doped Barium Zirconate Nanocrystalline Powder Prepared by Spray Pyrolysis

2014 ◽  
Vol 798-799 ◽  
pp. 407-412 ◽  
Author(s):  
Eliana Navarro Santos Muccillo ◽  
M.D. Gonçalves ◽  
Robson L. Grosso ◽  
R. Muccillo
Keyword(s):  
Particle Size ◽  
Spray Pyrolysis ◽  
Gas Flow ◽  
Proton Conductor ◽  
Ceramic Materials ◽  
Solid Particles ◽  
Nanocrystalline Powders ◽  
Nanocrystalline Powder ◽  
Barium Zirconate ◽  
Medium Particle

Investigation on polycrystalline electroceramics involves the synthesis, the consolidation and the analysis of the electrical behavior, along with careful evaluation of the final microstructure. The synthesis of ceramic powders with controlled characteristics is crucial in the study of materials with optimized properties. Distinct properties may be found in ceramic materials prepared by the several existing methods, due to chemical and phase homogeneities, and to the particle size distribution or medium particle size. In this work, yttrium-doped barium zirconate proton conductor was synthesized by spray pyrolysis, and characterized by several techniques aiming identifying the influence of some parameters of this method of synthesis with particle characteristics. Nanocrystalline powders synthesized at 600-700oC were found to be cubic and single phase. Moreover, depending on the gas flow and furnace temperature, spheroid and porous or cubic and solid particles may be obtained.

scholarly journals Channelized Substrates Made from BaZr0.75Ce0.05Y0.2O3−d Proton-Conducting Ceramic Polymer Clay

Membranes ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 130
Author(s):  
Sandrine Ricote ◽  
Benjamin L. Kee ◽  
W. Grover Coors
Keyword(s):  
Low Cost ◽  
Proton Conductor ◽  
High Volume ◽  
Proton Conductors ◽  
Membrane Reactors ◽  
Barium Zirconate ◽  
Separation Membrane ◽  
Complex Architectures ◽  
State Ceramic ◽  
Low Cost Manufacturing

A novel process for producing thick protonic ceramics for use in hydrogen separation membrane reactors is demonstrated. Polymer clay bodies based on polyvinyl acetate (PVA) and mineral oil were formulated, and they permitted parts with complex architectures to be prepared by simple, low-pressure molding in the unfired, “green” state. Ceramic proton conductors based on doped barium zirconate/cerate, made by solid-state reactive sintering, are particularly well-suited for the polymer clay process. In this work, the ceramic proton conductor, BZCY755 (BaZr0.75Ce0.05Y0.2O3−d) was fabricated into a variety of shapes and sizes. Test coupons were produced to confirm that the polymer clay route leads to a high-quality ceramic material suitable for the demanding environment of high-temperature membrane reactors. It has been demonstrated that protonic ceramic specimens with the requisite properties are easily prepared at the laboratory scale. The polymer clay fabrication route opens up the possibility of high-volume, low-cost manufacturing at a commercial scale, by a process similar to how dinnerware and sanitary porcelain are produced today.

Improving the Performance of High Temperature Protonic Conductor (HTPC) Electrolytes for Solid Oxide Fuel Cell (SOFC) Applications

2009 ◽  
Vol 421-422 ◽  
pp. 336-339
Author(s):  
Emiliana Fabbri ◽  
Daniele Pergolesi ◽  
Alessandra D'Epifanio ◽  
Elisabetta di Bartolomeo ◽  
G. Balestrino ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Chemical Stability ◽  
Electrochemical Impedance ◽  
Proton Conductor ◽  
Xrd Analysis ◽  
Solid Oxide ◽  
Barium Zirconate ◽  
Oxide Fuel ◽  
Barium Cerate ◽  
Before And After

This work investigated the possibility of coupling the high conductivity of cerates and the good chemical stability of zirconates as proton conductor electrolytes for solid oxide fuel cells (SOFCs). Two different approaches are discussed: the synthesis of barium cerate and zirconate solid solutions, and the fabrication of a bilayer electrolyte made of a Y-doped barium cerate pellet covered by a thin protecting layer of Y-doped barium zirconate. The chemical stability of the tailored samples was tested exposing them to 100% CO2 atmosphere at 700°C for 3 h. X-ray diffraction (XRD) analysis was used to investigate the phase composition of the specimens before and after the CO2 treatment. Electrochemical impedance spectroscopy (EIS) measurements were carried out in humidified H2. Hydrogen-air breathing fuel cell experiments were carried out at 700°C.

Electron-Mirror Microscopic Aspects of Ferroelectric Domains of BaTiO3 And Ca2Sr (C2H5CO2)6

1970 ◽  
Vol 28 ◽  
pp. 478-479
Author(s):  
Teruo Someya ◽  
Jinzo Kobayashi
Keyword(s):  
Surface Layer ◽  
Electric Fields ◽  
Quantitative Study ◽  
Recent Progress ◽  
Ferroelectric Domain ◽  
Resolving Power ◽  
Surface Pattern ◽  
Crystal Surfaces ◽  
One Dimensional ◽  
Ferroelectric Domains

Recent progress in the electron-mirror microscopy (EMM), e.g., an improvement of its resolving power together with an increase of the magnification makes it useful for investigating the ferroelectric domain physics. English has recently observed the domain texture in the surface layer of BaTiO3. The present authors ) have developed a theory by which one can evaluate small one-dimensional electric fields and/or topographic step heights in the crystal surfaces from their EMM pictures. This theory was applied to a quantitative study of the surface pattern of BaTiO3).

The Nature of Oxide Surfaces: Topographic and Electronic Structure

1993 ◽  
Vol 51 ◽  
pp. 966-967
Author(s):  
Dawn A. Bonnell ◽  
Yong Liang
Keyword(s):  
Transition Metal Oxides ◽  
Electronic Structures ◽  
Recent Progress ◽  
Spatial Localization ◽  
Level Of Detail ◽  
Scanning Tunneling ◽  
Oxide Surfaces ◽  
Tunneling Microscopy ◽  
Considerable Effort ◽  
Complete Understanding

Recent progress in the application of scanning tunneling microscopy (STM) and tunneling spectroscopy (STS) to oxide surfaces has allowed issues of image formation mechanism and spatial resolution limitations to be addressed. As the STM analyses of oxide surfaces continues, it is becoming clear that the geometric and electronic structures of these surfaces are intrinsically complex. Since STM requires conductivity, the oxides in question are transition metal oxides that accommodate aliovalent dopants or nonstoichiometry to produce mobile carriers. To date, considerable effort has been directed toward probing the structures and reactivities of ZnO polar and nonpolar surfaces, TiO2 (110) and (001) surfaces and the SrTiO3 (001) surface, with a view towards integrating these results with the vast amount of previous surface analysis (LEED and photoemission) to build a more complete understanding of these surfaces. However, the spatial localization of the STM/STS provides a level of detail that leads to conclusions somewhat different from those made earlier.

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