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固体氧化物燃料电池中的电解质 总被引:16,自引:3,他引:16
综述了固体氧化物燃料电池(SOFC)中固体电解质的研究概况,分析了ZrO2基、CeO2基、Bi2O3基固体电解质和掺杂的LaGaO3为代表的钙钛矿结构的固体电解质的优缺点以及作为SOFC电解质存在的问题,中低温度下稳定的高离子电导率的固体电解质的研制开发及固体电解质的薄膜化研究是降低S0FC工作温度的两个重要途径。 相似文献
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采用共沉淀法制备了中温固体氧化物燃料电池(IT-SOFC)电解质材料Ce0.8Gd0.2O2-δ,并对其进行了性能测试。X射线测试表明,前驱体经1000℃煅烧后得到的粉末为单一的立方萤石结构。SEM测试表明煅烧温度对粉末形貌及烧结体致密度有重大影响,1350℃烧结后烧结体的相对密度能达到96.4%。同时高温阻抗谱表明,该电解质700℃时离子电导率为0.003 S/cm。 相似文献
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中温固体氧化物燃料电池电解质材料的研究进展 总被引:28,自引:4,他引:24
评述了中温固体氧化物燃料电池(中温SOFC)中固体电解质的研究进展,对ZrO2基、CeO2基、Bi2O3基和ABO3型的钙钛矿类4种电解质材料的最新进展和今后的发展趋势作了评述。对几种电解质材料的优缺点进行了分析,同时对高温电解质YSZ薄膜化技术也作了简要介绍,因此不难得出,寻求新的、优良的中温SOFC的电解质材料仍然是新世纪推动中温SOFC实用化的关键任务之一,而YSZ薄膜化技术的研究则是研究的另一个重点,且最有可能取得突破。 相似文献
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用微乳液和碳吸附耦合法制备了氧化钐、氧化钆二元稀土掺杂氧化铈纳米粉体(Sm2O3)0.08(G d2O3)0.02(C eO2-δ)0.8。探讨了碳黑的加入量对粉体表面积的影响,得到最佳的碳黑加入量。利用XRD、TEM和BET方法对其物相、分散性、颗粒形貌和比表面积等性能进行了表征。结果表明:700℃焙烧的粉体呈现良好的结晶状态,为立方萤石结构,比表面积为65m2/g,平均颗粒直径为12nm,分散良好。利用交流阻抗法测试了材料的电导率。结果表明,电导率随烧结温度的升高而增大。 相似文献
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The defect behaviors, such as fundamental point defect, defect pair formation and oxygen vacancy migration in ceria, were studied on the basis of energy minimization calculations. The result shows that anion Frenkel disorder is the preferred intrinsic disorder, and it is easier to be dissolved in CeO2 for CaO and SrO than for MgO and BaO via an oxygen vacancy compensation mechanism. The association energy of an oxygen vacancy with a substitutional cation depends on dopant cation radius. The favorable migration route for oxygen vacancy with the lowest migration energy is from the second neighbor site to another one. 相似文献
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稀土复合掺杂钙钛矿型阴极材料制备工艺的研究 总被引:2,自引:1,他引:1
采用传统固相反应法制备了中温固体氧化物燃料电池中的稀土复合掺杂钙钛矿型阴极材料。借助XRD、DTA、SEM等分析仪器研究和讨论了不同元素、不同成分、不同焙烧温度、不同保温时间对所制备材料性能的影响。结果表明:该类材料的固相反应温度范围为:1000℃~1300℃;适宜的保温时间为10h;反应物经混合、压片、烧成和研磨可以合成晶粒尺寸为1nm~5nm的粉料,对ABO3型LaMnO3进行复合掺杂,表明A位Sr2+、Ca2+共同掺杂取代部分La3+以及B位Co3+、Fe3+双掺杂都能够提高材料的电导率。 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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As a mixed ion-electronic conductor, doped ceria, especially rare earth doped ceria, were used as anodes or components of anodes in SOFCs. In this work, calcium doped ceria (CCO) was synthesized to be used in intermediate-temperature SOFCs (IT-SOFCs) anodes in order to reduce the cost of anode-supported SOFCs. Electrical conductivity of 20% calcium doped ceria (20CCO) reached 0.209 S·cm-1 in hydrogen at 850 ℃, and 0.041 S·cm-1 in air at 800 ℃, which is about 0.04 S·cm-1 lower than that of conventional samaria-doped ceria (0.079 S·cm-1). Electrochemical performance of Ni-20CCO cermet as anode was investigated using a fuel cell with 35 μm-thick SDC electrolyte and Sm0.5Sr0.5Co-SDC cathode. Maximum power density was 623 mW·cm-2 under humidified (3% H2O) hydrogen at 650 ℃, inferring high catalytic activity of the Ni-20CCO anode. 相似文献
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A series of solid solution material based on ceria, Ceo.9Cao.l-xSrsOi.90(x = 0, 0.04, 0.05, 0.06), were synthesized by a solid reaction method. Ceria doped with two alkali earth dements has cubic fluorite structure. The ionic conductivity of these materials at high temperature was studied by impedance spectra, and an increasing effect of ionic conductivity was found. A maximum conductivity is achievedwhen the effective ionic radius is near to the critical radius (0. 1106 nm). Some fuel cells were made using these materials as electrolyte. The output power and current of the SOFC with the electrolyte of double doped ceria are better than those of YSZ and single doped ceria, and the open-circuit-voltage of the double doped ceria is also higher than that of the single doped ones. 相似文献
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研究了 2 98K时Tm(ClO4 ) 3,Tm (CH3SO3) 3,Tm(NO3) 3,LaCl3,La(NO3) 3和La(ClO4 ) 36种稀土盐在二甲基亚砜中的导电性。其中 ,La(ClO4 ) 3,Tm(NO3) 3,Tm (ClO4 ) 3表现出强电解质的性质 ,并计算出了它们的极限摩尔电导率Λm∞ 分别为 :15 6.4,14 6.8和12 5 .5S·cm2 ·mol- 1 。在相同溶剂、相同质量摩尔浓度和相同的温度范围内 ,研究了 6种稀土盐电导率受温度变化的影响 ,得出稀土离子在二甲基亚砜中缔合程度的顺序为 :氯化物 >硝酸盐 >甲磺酸盐 >高氯酸盐 相似文献
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研究了不同温度、电解残渣含量以及电解质成分下流水线镁电解槽电解质电导率的变化规律。结果表明,在MgCl2-NaCl-KCl三元体系中,温度升高、电解残渣量增加会导致电导率升高;MgO含量增加、MgCl2浓度增加会引起电导率降低;KCl含量增加、保持MgCl2浓度不变的条件下NaCl浓度增加时电导率先降低后升高。 相似文献
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研究了随炉冷却和空冷两种冷却方式对新型石榴石结构固态电解质Li6BaLa2Ta2O12导电性能的影响。综合运用XRD、SEM、EIS、6Li-MAS-NMR对试样进行表征。结果表明,合成物基本都为石榴石结构;随炉冷却试样烧结粉末中有团聚现象;提高冷却速度可以提高试样的导电性能,降低电导活化能。试样中存在两种位置不同的离子,LiO4四面体间隙和LiO6八面体间隙。冷却速度较快的试样中可动锂离子数目较多,导电性较好。 相似文献