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Thesolidelectrolyteisakeycomponentofsolidoxidefuelcell (SOFC) .Dopedceriaisoneofpromis inghigh conductingsolidelectrolyteinSOFC[1,2 ] .Butitiswell knownthatitisdifficulttosinterdopedceriabysolidstatereactioninair .TheCe0 .9RE0 .1O2 -δelectrolytematerialswerepreparedbythesol gelmethod .Thesinteringtemperatureofthesamplescandecreasetoabout 4 0 0K .Theionicconductivityandlinearthermalexpansionpropertiesofsol gelpreparedCe0 .9RE0 .1O2 -δinawidetemperaturerangewerein vestigated .Thepowder… 相似文献
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In order to lower the raw materials cost and develop a novel cathode materials for intermediate temperature solid oxide fuel cell(ITSOFC), using mixed rare earth replacing the expensive pure La2O3 as the raw materials, the powders of Ln0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ (Ln=the mixed rare earth, x=0.05, 0.10, 0.15) for the applications as the cathode materials were prepared by microwave sintering process. The crystal structure and the particles morphology of the obtained powders were characterized by XRD and SEM, the electrical conductivity of all samples sintered at 1200 ℃ for 3 h was also measured as the function of the temperature from 100 to 800 ℃ by DC four-probe method in air. The experimental results show that due to the influence of mixed rare earth the powders of Ln0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ synthesized at 1200 ℃ for 0.5 h with the mean particle size of 1~20 μm was of perovskite and cubic fluorite phase as well a little SrO phase, the electrical conductivity of the samples decreases with the adding Ca2+ content, and are all higher than 100 S·cm-1 from 500 to 700 ℃ when x≤0.10. Ln0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ. Can meet the demand of the electrical properties for the cathode materials in ITSOFC. 相似文献
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Synthesis and Electrical Conductivities of Sm2O3-CeO2 Systems 总被引:1,自引:0,他引:1
Solidoxidefuelcell(SOFC)hasattracteda greatattentionasapromisingtechniqueforelectrical powergeneration[1].Thecurrentstate of the art SOFCsusesyttriastabilizedzirconia(YSZ)electro lyte,operatesat800~1000℃duetothelowoxy genionicconductivityoftheYSZelect… 相似文献
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Mn0.1Ce0.9Ox and Mn0.1Ce0.6Zr0.30x samples synthesized by sol-gel method were tested for redox properties through the dynamic oxygen storage measurement and characterized using X-ray diffraction, BET, electron paramagnetic resonance, and X-ray photoelectron spectroscopy. The results showed that redox performances of ceria-based materials could be enhanced by synergetic effects between Mn-O and Ce-O. Fresh and aged samples were characterized with the fluorite-type cubic structure similar to CeO2, and furthermore, the thermal stability of Mn0.1Ce0.9Ox materials was improved by the introduction of some Zr atoms. From XPS, it could be concluded that Mn^2+/Mn^3+ redox couples existed on the surface of Mn0.1Ce0.9Ox and Mn0.1Ce0.6Zr0.3Ox samples. Electron paramagnetic resonance researches revealed that there were three types of Mn^2+ species: isolated Mn^2+ substituting for Ce^4+ ions in the lattice with a cubic symmetry, ones in defect with a noncubic symmetry, and at the surface of samples. 相似文献
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利用低温燃烧合成法制备了Al2O3掺杂浓度为0.5%~10%(摩尔分数,以下同)的Al2O3/Ce0.8Y0.2O1.9固体电解质复合材料。研究了Al2O3掺杂浓度对Ce0.8Y0.2O1.9固体电解质烧结及电性能的影响。试验结果表明,添加少量的Al2O3可以改善Ce0.8Y0.2O1.9固体电解质的烧结性能,当Al2O3的添加量为0.5%时,电解质粉体具有最佳的烧结性能,1350℃时的相对密度达到99%以上。当Al2O3的掺杂浓度超过其在Ce0.8Y0.2O1.9中的溶解极限时,随Al2O3掺杂量的继续增加,烧结体的相对密度开始下降。阻抗谱结果表明,在溶解极限范围内,Al2O3使Ce0.8Y0.2O1.9的电导率减小,电导活化能增加。Al2O3的掺杂浓度超过溶解极限时,Ce0.8Y0.2O1.9的晶粒电阻不变,由于Al2O3对晶界的"清洁"作用,晶界电阻减小;当Al2O3的掺杂浓度超过5%时,由于Al2O3颗粒对晶界的"阻塞"作用,晶界电阻增加。 相似文献
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Animportantgoalinthedevelopmentofsolidox idefuelcells (SOFCs)istoreducetheoperatingtem peratureofthefuelcellstackfrom 10 0 0℃tobelow85 0℃soastogetanoptimumtrade offbetweenper formanceandlifetimeofthestackandtoreducetheoverallsystemcost[1] .Toachievethisdestinat… 相似文献
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稀土元素的特殊性质及其应用 总被引:5,自引:0,他引:5
王学正 《有色金属材料与工程》1994,15(1):47-51
本文从稀土元素微观结构角度,揭示了稀土元素的某些特殊性质,并指出这种特性与应用机理有必然的联系。从而启迪稀土使用者,掌握和了解稀土的基本特性,才能自由地驾驭稀土的应用。 相似文献
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The highly phase-pure electrolyte materials with compositionLa1.9Ba0.1MO1.9Mn0.1O9(LBMMO) was prepared by the sol-gel auto-combustion method for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The details ofgel's auto-combustion, phase evolution, sintering, thermal expansion and electrochemical performance of LBMMO were investigated by means of thermo-gravimetry (TG), X-ray diffxaction (XRD), scanning electron microscopy (SEM), transmission electron spectroscopy (TEM), thermal expansion curve (TEC) and complex impedance spectra. The results showed that the highly phase-pure electrolyte LBMMO could be obtained after calcining at 600 ℃. The sample sintered at 900 ℃ for 4 h in air exhibited a better sinterability, and the relative density of LBMMO was higher than 96%. The electrical conductivities of the sample were 6.7x 10-3 and 25.9× 10-3 S/cm at 700 and 800 ℃ in air, respectively. Results also showed that LBMMO had moderate thermal expansion (a=16.3×10-6 K-l, between room temperature and 800 ℃) and an electrical activation energy equal to 1.32 eV). 相似文献
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The effect of rare earth element Ce on microstructure, electrical conductivity and mechanical properties was studied.Using optical microscope, scanning electron microscope, transmission electron microscope and X-ray diffractometer, the microstructure and phase composition of aluminum rod for electrical purpose were measured and analyzed.The results indicate that rare earth element Ce can considerably refine grain size of aluminum rod for electrical purpose,improve the regular distribution pattern of the impurity, such as silicon and iron which present in the aluminum matrix,form stable metal compound with pernicious impurity.This metal compound precipitates on the crystal boundary.As a result, the solid solubility of impurity in aluminum reduce, and the electrical conductivity of aluminum rod for electrical purpose is improved.It is found that the mechanical properties of aluminum rod for electrical purpose are improved by rare earth element in certain range of RE addition. 相似文献
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Solidoxidefuelcells (SOFCs)haveseveraldis tinctadvantages ,e .g .,highenergyconversioneffi ciency ,wideadaptabilitytofuels ,theusageofnon preciousmaterials ,noliquids ,nocorrosions ,modularconstructionandmuchlowerproductionofNOx,SOxandnoise .Therefore ,theyreceiveincreasingatten tion[1,2 ] .AtypicalSOFCwhichutilizesyttria stabi lizedzirconia (YSZ)astheelectrolyterequireshighoperationtemperaturesuchas 10 0 0℃togainhighe noughionicconductivity .Loweringtheoperationtem peratureto 80 0℃wou… 相似文献
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从理论和实际应用两个方面具体阐述了钙-钙双碱法的应用及取得的效果。详细论述了XP型脱硫除尘塔板的运行工艺。以大量的数据显示了钙-钙双碱法的实际应用情况,在同样条件下将XP型塔板与旋流塔板从脱硫效率和除尘效率两方面分别进行了比较。 相似文献
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A novel catalytic material Lao.9Sr0.1MnO3 and tourmaline compound catalytic material was synthesized in the base of traditional catalytic material La0.9Sr0.1MnO3 which exhibited excellent catalytic activity for methane combustion. Different contents of toumaaline were added to give a series ofLa0.9Sr0.1MnO3 and tourmaline catalytic material through a sol-gel method. Samples above were characterized and analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller method (BET), temperaalre programmed reduction (TPR), catalytic activity test and contact angle test. The as-prepared sample with 2% (m/m) tourmaline showed good homogeneity surface morphology and displayed the optimal catalytic activity. The light-off temperature reduced by 10 ℃ and the T90 decreased by 15 ℃. In addition, the mechanism of the reinforcement of catalytic activity was explored. 相似文献
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The forming-regions and properties were studied on phosphate system glasses Sm2O3 doped by two step melting method. It shows that with the increasing of rare earth content, the forming-regions would shrink and the content of Sm2O3 should be controlled in 15 mol %. The structure and absorption spectrum were tested by infra-red spectrum and spectrophotometer. The experimental results provide that with the. increasing of Sm2O3 content, the characteristic absorption peak of 1280 cm- 1 would move to the low wave numbers and vibration weakening, in the absorption spectrum,the intensity of characteristic absorption peak was enhanced and broadened at 1075 nm, and the transmittance of 1060 nm is lessthan 1% . 相似文献
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Structure and Luminescence Properties of Eu~(3+) Doped SiO_2 Glass Synthesized by Sol-Gel Process 总被引:2,自引:0,他引:2
Amonglanthanideions ,Eu3 + ionposs esesgoodluminescentcharacteristics ,highcolorpurityandhighquantumefficiency .Eu3 + isoneofthecentralionsfirstselectedforthepreparationofrareearthionsdopedlumi nescentmaterials .Dafinovaetal .[1] producedEu3 + andSO2 -4 dopedtungsta… 相似文献