Study on the Electrolyte Material BaCe1-xYxO3-δ’s Raman Spectra and Electrical Properties for Intermediate-Temperature Solid Oxide Fuel Cells

2011 ◽  
Vol 233-235 ◽  
pp. 2419-2423
Author(s):  
Jin Xia Wang ◽  
Jia Wen Jian ◽  
Yuan Yuan Gu
Keyword(s):  
Oxygen Vacancy ◽  
Solid Oxide Fuel Cells ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Solid Oxide ◽  
Crystal Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Single Perovskite Phase ◽  
The Relationship

In this paper we used sol-gel method for synthesizing Y3+-doped BaCeO3 solid electrolyte BaCe1-xYxO3-δ(x=0.10, 0.15, 0.20, 0.25, 0.30). The samples crystallized in a single perovskite phase by X-ray diffraction analysis after sintering at 1450°C in air for 10h; Raman spectrum measurements indicated that the increasing of Y3+ doped content increased the crystal symmetry and increased the oxygen vacancy content for the samples, all Y3+ ions were doped into the Ce-sites; The electric conductivities of the samples increased with Y content and reach a maximum at x=0.25, then decreased. The relationship between proton conductivity and Y dopant was closely related with oxygen vacancy content, crystal symmetry and the forming of defect association.

Preparation and properties of solid electrolyte CaxBi1.7−xW0.3O3.45−0.5x electrolyte material by sol–gel combution method

2019 ◽  
Vol 12 (05) ◽  
pp. 1951001
Author(s):  
Jie Yang ◽  
Changan Tian ◽  
Yu Wang ◽  
Junjie Meng ◽  
Dongdong Ji ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Combustion Method ◽  
Solid Oxide ◽  
Electrochemical Studies ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Differential Thermogravimetric Analysis

CaxBi[Formula: see text]W[Formula: see text]O[Formula: see text] (CBW) ([Formula: see text], 0.05, 0.10, 0.15, 0.20, 0.30) electrolyte material were synthesized by sol–gel self-combustion method. The samples were characterized by thermogravimetric-differential thermogravimetric analysis(TG-DSC), X-ray diffraction, scanning electron microscopy (SEM), porosity and electrochemical impedance spectroscopy (EIS). The results show the powders CaxBi[Formula: see text]W[Formula: see text]O[Formula: see text] (CBW) with fluorite crystal structure can be obtained after the precursor was calcined at 760∘C. When sintered at 780∘C for 2[Formula: see text]h, the compact ceramic sintered with relative density higher than 97% can be obtained. The electrochemical studies showed that CaxBi[Formula: see text]W[Formula: see text]O[Formula: see text] (CBW) have high ionic conductivity after 780∘C sintering. The sample Ca[Formula: see text]Bi[Formula: see text]W[Formula: see text]O[Formula: see text] exhibits a conductivity of 0.07978 S[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text] at 750∘C, and the activation energy is 0.845[Formula: see text]eV, which is expected to be applied to the electrolyte materials for intermediate temperature solid oxide fuel cells (SOFC).

Effects of Sr Doping Content on the Structure and Morphologies of La0.7SrxCa0.3-xMnO3

2015 ◽  
Vol 1120-1121 ◽  
pp. 507-511
Author(s):  
Gang Wang ◽  
Shao Qun Jiang ◽  
Qi Zhang ◽  
Meng Wu ◽  
Ze Hua Wang ◽  
...  
Keyword(s):  
Sintering Temperature ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Doping Content ◽  
X Ray Diffraction ◽  
Structure Transition ◽  
X Ray ◽  
Single Perovskite Phase ◽  
Dense Microstructure ◽  
Cubic Structure

The La0.7SrxCa0.3-xMnO3 (x=0, 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3) were prepared by combining sol-gel method and high temperature sintering. The effects of Sr doping content on the structure and morphologies of the La0.7SrxCa0.3-xMnO3 finally sintered at 1050°C/1250°C were investigated based on the analyses of X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The results show that the La0.7SrxCa0.3-xMnO3 exhibit single perovskite phase and the change of Sr doping content can result in phase structure transition. The La0.7SrxCa0.3-xMnO3 samples are rhombohedra structure in the range of 0.15≤x≤0.3. When x is no more than 0.1, the La0.7SrxCa0.3-xMnO3 samples sintered at 1050°C present distorted cubic structure. The microstructure of La0.7SrxCa0.3-xMnO3 sintered at 1050°C for 5h becomes more and more looser and its grains tend to refinement with the increase of Sr doping content when x is no less than 0.05. Increasing the final sintering temperature can improve the density and promote the grain growth of La0.7SrxCa0.3-xMnO3. In order to gain a dense microstructure, the final sintering temperature of La0.7SrxCa0.3-xMnO3 should be higher than 1050°C and should be suitably increased with the increase of Sr doping content.

Synthesis of La2NiO4+δ Nanofibers by Electrospinning Method and their Application

2018 ◽  
Vol 281 ◽  
pp. 859-864
Author(s):  
Yan Xing ◽  
Meng Fei Zhang ◽  
Tian Jun Li ◽  
Wei Pan
Keyword(s):  
Electron Microscopy ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Thermal Treatments ◽  
X Ray Diffraction ◽  
Mixed Conductivity ◽  
X Ray ◽  
Transmission Electron ◽  
Structure Morphology ◽  
Electrospinning Method

La2NiO4+σ nanofibers exhibiting typical Ruddlesden–Popper structure (K2NiO4) were fabricated by a facile electrospinning method. X-ray diffraction, scanning electron microscopy and transmission electron microscopy were used to analyze the structure, morphology and crystal process of the La2NiO4+σ nanofibers. For electrical properties measurement, uniaxially aligned nanofibers were directly collected and assembled into electrode. In our research, La2NiO4+σ phase forms above 873K with no impurity phase emerges during the thermal treatments. The nanofibers are smooth and uniform throughout the entire length and the grain is growing as calcination temperature increases. Furthmore, the La2NiO4+σ nanofibers own high mixed conductivity at 773K, laying good foundation for intermediate temperature solid oxide fuel cells application.

Characterization of LSCF-Based Composite and LSCF as Cathodes for Intermediate Temperature SOFCs

2012 ◽  
Vol 727-728 ◽  
pp. 657-662
Author(s):  
Reinaldo Azevedo Vargas ◽  
Everton Bonturim ◽  
Marco Andreoli ◽  
Rubens Chiba ◽  
Emília Satoshi Miyamaru Seo
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Spraying ◽  
Potential Use ◽  
Scanning Electron

The (La0.60Sr0.40)(Co0.20Fe0.80)O3-δ - LSCF, (Ce0.90Gd0.10)O1.95 - CGO composites and LSCF were deposited by wet powder spraying deposition method for the purpose of investigating their potential use in Intermediate Temperature Solid Oxide Fuel Cells. The interlayers are necessary between CGO electrolytes and LSCF cathodes in order to improve the performance of these materials. LSCF particles synthesized by citrate technique were calcined at 900 °C for 4 h and, their LSCF-CGO composites and LSCF suspensions deposited on CGO substrate and, sintered in 1100 °C for 1 h, were formed pseudo-perovskite. The ceramics materials were analyzed by X-ray diffraction (XRD) and chemical composition of different half-cells layers by scanning electron microscope with energy dispersive (SEM-EDS). The results are in agreement with the literature and indicate that route studied is adequate for crystal structures formation compatible with films the 35 µm thick total for study of conductivity between the cathode and the electrolyte.

X-ray diffraction analysis for thin films of PbTiO3-La2/3TiO3 prepared by the sol-gel method

1994 ◽  
Vol 9 (8) ◽  
pp. 2133-2137 ◽  
Author(s):  
Hideki Yoshioka
Keyword(s):  
Thin Films ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Diffraction Method ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coating Methods ◽  
Diffraction Patterns ◽  
System 1

Thin films in the system (1 - x) PbTiO3−xLa2/3TiO3 were prepared by the sol-gel and dip-coating methods. Phases deposited in the films and the lattice parameters as a function of the composition were investigated by the x-ray diffraction method. The solid solutions with a perovskite structure were formed as a single phase with x up to 0.9. For the composition of x = 1.0, metastable La-Ti-O perovskite phase with a small amount of the impurity phase, La2Ti2O7, was obtained. Simulation of x-ray diffraction patterns based on the defect structure model shows that the structure of the La-Ti-O perovskite phase includes randomly distributed cation vacancies at the A-site, namely (La2/3□1/3)TiO3.

Electrical Property of Mn and Co Dopants on La3Ni2O7±δ and La2.9Sr0.1Ni2O7±δ

2010 ◽  
Vol 93-94 ◽  
pp. 566-569
Author(s):  
Wassayamon Singkha ◽  
Sutin Kuharuangrong
Keyword(s):  
Grain Size ◽  
Electrical Property ◽  
Solid Oxide Fuel Cells ◽  
Sintered Sample ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mn Content ◽  
Mn Dopant

La3Ni2O7±δ and La2.9Sr0.1Ni2O7±δ Ruddlesden-Popper nickelate were synthesized via citrate gel method. The electrical property of Mn and Co dopants on Ni site in these systems was investigated as possible cathode for solid oxide fuel cells. The result of X-ray diffraction shows the presence of La2NiO4 in La3Ni2-xMxO7±δ and La2.9Sr0.1Ni2-xMxO7±δ (M = Mn or Co) as M content increases from x = 0.1 for Mn and x = 0.2 for Co. With further increase of Mn dopant (x ≥ 0.4), LaMnO3 and La2O3 appear with La2NiO4. The grain size of sintered sample decreases as Mn content increases. However, it slightly decreases with increasing Co content. The TEC value increases with Co content. The DC four-point measurement shows a decrease in the conductivity as Co content increases for both La3Ni2-xCoxO7±δ and La2.9Sr0.1Ni2-xCoxO7±δ systems.

Studies of Half-Cell for Anode Supported SOFC after Reduction

2011 ◽  
Vol 287-290 ◽  
pp. 2511-2515 ◽  
Author(s):  
Xia Wang ◽  
Feng Hui Wang
Keyword(s):  
Residual Stress ◽  
Solid Oxide Fuel Cells ◽  
Hydrogen Reduction ◽  
Solid Oxide ◽  
X Ray Diffraction ◽  
Electrolyte Layer ◽  
Half Cell ◽  
X Ray ◽  
Stress Changes ◽  
Different Temperatures

The performance of half-cell for anode supported Solid Oxide Fuel Cells (SOFCs) is necessary to wide use of SOFCs. This work is to study the reduction degree of anode and the residual stress changes that occur during hydrogen reduction on the different temperatures and in different times. The porosity of the specimens with oxidation is less than that of the reduction one. There is no Ni phase in the sample before hydrogen reduction. After hydrogen reduction on 1000°C for 6 hours, there is no NiO phase in the sample. It reveals the NiO has been reduced into Ni completely. We also investigate residual stresses in the electrolyte layer using X-ray diffraction. The residual stress value of electrolyte is about -844.1MPa before reduction. After hydrogen reduction on 800°C for 9 hours, the residual stress is decreased to -474.8MPa. So the reduction temperature can choose as 600°C and the reduction time can choose as 9 hours.

Microwave Processing of Sol-Gel Derived Potassium Niobate

1990 ◽  
Vol 180 ◽  
Author(s):  
Z. Fathi ◽  
I. Ahmad ◽  
D.E. Clark
Keyword(s):  
Sol Gel ◽  
Microwave Energy ◽  
Phase Changes ◽  
Conventional Heating ◽  
Potassium Niobate ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Novel Processing ◽  
The Relationship

ABSTRACTMicrowave energy has been used in a novel processing method. The relationship between processing, structure and properties of sol-gel-derived potassium niobate sol as well as thin films has been investigated. A comparison has been established between microwave and conventional heating for drying, calcining and crystallizing sol-gel-derived samples. Structural and phase changes were monitored by thermogravimetric analysis (TGA), differential thermal analysis (DTA) and x-ray diffraction (XRD).

Study of the Phase Formation of Sol-Gel YBa2Cu3O7-x Samples in Flowing Oxygen Atmosphere

2007 ◽  
Vol 546-549 ◽  
pp. 2097-2102
Author(s):  
Ting Luo ◽  
Yi Zhang ◽  
Qing Rong Feng
Keyword(s):  
Room Temperature ◽  
Sol Gel ◽  
Oxygen Atmosphere ◽  
Ambient Atmosphere ◽  
X Ray Diffraction ◽  
X Ray ◽  
Whole Process ◽  
Relationship Of ◽  
The Relationship ◽  
Flowing Oxygen

The relationship of the resistivity versus synthesizing temperature of sol-gel YBa2Cu3O7-x samples, with Tc 91K, was studied while synthesizing in flowing oxygen atmosphere. A set of high temperature -T curves were obtained for the whole process. After four rounds of synthesizing, the resistivity of the sample was =1.00×10-3cm at room temperature. The -T curve of the last round also showed that the orthorhombic to tetragonal phase transformation of the sample occurred around 600oC that is lower than the YBa2Cu3O7-x sample prepared in ambient atmosphere. Other measurements such as X-ray diffraction, SEM measurement, low temperature R-T and M-T measurement were also taken to get more information of these samples.

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