ChemInform Abstract: Proton Conduction in Sintered Oxides Based on BaCeO3.

Iwahara, Hiroyasu; Uchida, Hiroyuki; Ono, Ken; Ogaki, K.

doi:10.1002/chin.198823361

Cited by 60 publications

(87 citation statements)

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“…Fuel cell test of BYZ thin film using platinum ink for both electrodes have been performed. Successful fuel cell measurements were carried out with a peak power density of 28 mW/cm 2 . It was shown the anode rather than the cathode is the most resistive electrode.…”

Section: Discussionmentioning

confidence: 99%

“…A maximum 25mW/cm 2 was achieved at 600C, Figure Impedance measurements of symmetric cell in oxygen show a total resistance of 6.9 ohm*cm 2 of which 4 ohm*cm 2 is due to the electrolyte, Figure 26. This implies a cathode resistance of 1.45 ohm*cm 2 . Similarly an anode resistance of 5.5 ohm*cm 2 is calculated.…”

Section: Baseline Fuel Cell Performance Demonstrationmentioning

confidence: 99%

“…Perovskite oxides are known as very important technological materials that show a number of physico-chemical properties, such as hightemperature superconductivity, ferroelectricity, piezoelectricity, as well as they can be just simple insulators. In many acceptor-doped perovskite-type oxides high protonic conductivity has been observed at elevated temperatures, when they are exposed to water vapor [1][2][3][4][5][6]. Along with reduced operating temperature in comparison to that of commercially produced SOFCs based on YSZ, doped perovskite oxides often exhibit very good chemical and mechanical stability, which make them attractive for potential applications in various electrochemical devices, in particular, in fuel cells, hydrogen sensors and hydrogen pumps.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Power Stability for Proton Conducting Solid Oxides Fuel Cells

Merinov¹,

Goddard²,

Haile³

et al. 2005

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In order to provide the basis for a rational approach to improving the performance of Y-doped BaZrO 3 electrolytes for proton conducting ceramic fuel cells, we carried out a series of coupled computational and experimental studies to arrive at a consensus view of the characteristics affecting the proton conductivity of these systems.The computational part of the project developed a practical first principles approach to predicting the proton mobility as a function of temperature and doping for polycrystalline systems. This is a significant breakthrough representing the first time that first principles methods have been used to study diffusion across grain boundaries in such systems. The basis for this breakthrough was the development of the ReaxFF reactive force field that accurately describes the structure and energetics of Y-doped BaZrO 3 as the proton hops from site to site. The ReaxFF parameters are all derived from an extensive set of quantum mechanics calculations on various clusters, two dimensionally infinite slabs, and three dimensionally infinite periodic systems for combinations of metals, metal alloys, metal oxides, pure and Y-doped BaZrO 3 , including chemical reaction pathways and proton transport pathways, structures.The ReaxFF force field enables molecular dynamics simulations to be carried out quickly for systems with ~ 10,000 atoms rather than the ~ 100 or so practical for QM.The first 2.5 years were spent on developing and validating the ReaxFF and we have only had an opportunity to apply these methods to only a few test cases. However these simulations lead to transport properties (diffusion coefficients and activation energy) for multi-granular systems in good agreement with current experimental results. Now that we have validated the ReaxFF for diffusion across grain boundaries, we are in the position of being able to use computation to explore strategies to improve the diffusion of protons across grain boundaries, which both theory and experiment agree is the cause of the low conductivity of multi-granular systems. Our plan for a future project is to use the theory to optimize the additives and processing conditions and following this with experiment on the most promising systems.The experimental part of this project focused on improving the synthetic techniques for controlling the grain size and making measurements on the properties of these systems as a function of doping of impurities and of process conditions. A significant attention was paid to screening potential cathode materials (transition metal perovskites) and anode electrocatalysts (metals) for reactivity with Y-doped BaZrO 3 , fabrication compatibility, and chemical stability in fuel cell environment. A robust method for fabricating crack-free thin membranes, as well as methods for sealing anode and cathode chambers, have been successfully developed. Our Pt | BYZ | Pt fuel cell, with a 100 μm thick Y-doped BaZrO 3 electrolyte layer, demonstrates the peak power density and short circuit current density of 28 mW/cm 2 and...

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Section: Discussionmentioning

confidence: 99%

Section: Baseline Fuel Cell Performance Demonstrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Power Stability for Proton Conducting Solid Oxides Fuel Cells

Merinov¹,

Goddard²,

Haile³

et al. 2005

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“…The proton transfer occurs from higher vapour pressure side, which is the negative pole on lower vapour pressure side. The reactions at each electrode are given as under [56]:…”

Section: Solid-electrolyte Typementioning

confidence: 99%

Classification and Applications of Humidity Sensors: A Review

Yadav¹

2018

IJRASET

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This review introduces an overview of importance of humidity, methods of their measurement. It gives Detailed description of humidity sensors; their types and properties have been discussed. It explains role of humidity in human life and need of humidity. It also deals with the experimental techniques for the development of humidity sensors and the water adsorption mechanism. Humidity sensors such as resistive type, optical, and ceramic humidity sensors etc. have been described.

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“…Since Iwahara et al [1,2] first reported the proton conduction phenomenon in the ABO3 perovskite compounds of doped strontium cerates and doped barium cerates, many doped perovskite-type cerates and zirconates compounds have been investigated intensively, especially during the recent years [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. However, high sintering temperatures (normally higher than 1600 ℃) and long sintering times (more than 24 h) are always needed for BaCeO3-and BaZrO3-based ceramic materials to obtain dense bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Protonic Conductor BaZr0.5Ce0.3Ln0.2O3-δ (Ln=Y, Sm, Gd, Dy) by Using a Solid State Reactive Sintering Method

Jönsson

Zhao

2014

13th International Ceramics Congress - Part A

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-19]. However, high sintering temperatures (normally higher than 1600 ℃) and long sintering times (more than 24 h) are always needed for BaCeO3-and BaZrO3-based ceramic materials to obtain dense bulk materials. But this will lead to very large grain sizes, and eventually result in a low mechanical strength. Thus, this will limit their application for electrolyte-support cell structure designs. Therefore, many wet chemistry methods have been introduced to prepare high quality nanocrystalline powders to decrease the sintering temperatures and sintering times of Barium zirconate and Barium cerate based materials [20]. In addition, various transition metal oxides, such as NiO, CoO, MnO, FeO, ZnO [8,9,[16][17][18][20][21][22][23][24][25][26], have been added into the pre-synthesized powder, to improve the sintering behaviour and to achieve a reduced sintering temperature. Among these alternative methods, the solid state reactive sintering (SSRS) method was improve by Tong et al. [23][24][25] for BaZr0.8Y0.2O3-δ, by Coors et al.[26] for BaZr0.6Ce0.2Y0.2O3-δ and by Ricote et al. [18] for BaCexZr0.9-xY0.1O3-δ by using NiO as a sintering aid. Therefore, the normal two separate steps solid-state reaction method for synthesize the powder and the sintering of pellets can be combined into one cost-effective single sintering step. Also, as one of the most promising protonic conductor candidates, BaCe0.5Zr0.3Y0.2O3-δ have attracted more and more attention during the recent years [27,28]. This is due to that it can maintain a good chemical and mechanical stability as well as that it possesses a very good electrical conductivity. Thus, dense ceramic pellets of lanthanides doped barium zirconate-cerate with the formula of BaCe0.5Zr0.3Ln0.2O3-δ (BZCLn532, Ln=Y, Sm, Gd, Dy) were prepared by the solid state reactive sintering method in this study. The obtained pellets were characterized by XRD and SEM. In addition, the relative densities of the BZCLn532 pellets, which were sintered at different sintering temperatures, were also studied.

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ChemInform Abstract: Proton Conduction in Sintered Oxides Based on BaCeO3.

Cited by 60 publications

References 1 publication

Enhanced Power Stability for Proton Conducting Solid Oxides Fuel Cells

Enhanced Power Stability for Proton Conducting Solid Oxides Fuel Cells

Classification and Applications of Humidity Sensors: A Review

Preparation of Protonic Conductor BaZr<sub>0.5</sub>Ce<sub>0.3</sub>Ln<sub>0.2</sub>O<sub>3-δ</sub> (Ln=Y, Sm, Gd, Dy) by Using a Solid State Reactive Sintering Method

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