共查询到19条相似文献,搜索用时 93 毫秒
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以Ni-SDC作为固体氧化物燃料电池(SOFC)的阳极,研究了该阳极粉末在制备过程中以及5% H2S-N2硫化后的产物,并用热力学软件绘制相图对其在各种温度下的产物变化进行分析。结果表明:NiO-SDC在800 ℃煅烧和在850 ℃还原的产物与热力学分析结果是一致的。对比在5%的H2S-N2中硫化12 h前后的XRD表明Ni已经转化为NiS2,热力学分析验证了该结论。比较Ni-SDC和SDC硫化前后的Raman光谱和XRD结果得到:SDC硫化后主峰型没有发生明显变化,但强度变弱,说明粒径变大,可能因为有Ce-O-S键生成。 相似文献
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在分析平板状固体氧化物燃料电池电化学特性的基础上,建立了Simlink仿真模型,探讨了工作温度和燃料中水蒸气含量对燃料电池理想电势和有效电势的影响。仿真结果表明,低电流密度下,温度的升高会导致有效电势的降低;高电流密度下,有效电势会随着温度升高而增加。水蒸气含量越低,燃料电池的理想电势和有效电势越高。 相似文献
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采用柠檬酸-硝酸盐燃烧合成了纳米级CeO2基阳极支撑平板式固体氧化物燃料电池(solid oxide fuel cell,SOFC)的电解质与电极材料。研究了SOFC三极板[NiO-Ce0.8Gd0.2O1.9(CGO),阳极;CGO电解质;La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)-CGO阴极]的制备工艺,对制膜过程、烧结工艺等做了探讨。指出了较佳的制备条件。结果表明:物理混合得到的阳极优于共燃烧得到的阳极;球磨分散得到的阳极致密,乳化分散得到的阳极中NiO与CGO的分散较为均匀。 相似文献
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Yeong-shyung Chou Jeffry W. Stevenson Lawrence A. Chick 《Journal of the American Ceramic Society》2003,86(6):1003-1007
A novel hybrid compressive mica seal was developed that showed an exceptionally low leak rate of ∼8.9 × 10−4 sccm/cm (standard cubic centimeters per minute per unit leak length of seal) at 800°C and a compressive stress of 100 psi, about 740 times lower than that of the conventional compressive mica seals (6.6 × 10−1 sccm/cm), at a pressure gradient of 2 psi. The hybrid compressive mica seals were composed of two compliant metallic layers and a mica layer. Three commercially available micas were tested in this study. All showed substantial improvements in reducing the leak rates by using the hybrid design. The best results were obtained using muscovite single-crystal mica and 125 μm silver layers. Using the paper form of muscovite and phlogopite mica, the leak rates were still far superior (∼1 × 10−1 sccm/cm) compared with mica without the compliant silver layer (about 6–9 sccm/cm). The microstructure of the mica was examined before and after the 800°C leak tests. These results are compared with results for hybrid seals using glass interlayers. In addition, an explanation for the substantial reduction of the leak rates is proposed, and the application of the hybrid compressive mica seals in planar SOFC stacks is briefly addressed. 相似文献
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Catalytic and Electrochemical Properties of Doped Lanthanum Chromites as New Anode Materials for Solid Oxide Fuel Cells 总被引:1,自引:0,他引:1
Philippe Vernoux Elisabeth Djurado Michael Guillodo 《Journal of the American Ceramic Society》2001,84(10):2289-2295
Defective perovskites contained in the general formula La(Sr)Cr(Ru,Mn)O3–δ are successfully synthesized by spray pyrolysis. Powders of high phase purity are obtained after annealing, and they are used to prepare homogeneous films by spray printing. From a catalytic point of view for the methane steam reforming, these powdered perovskites do not generate a carbon deposit. Catalytic results, focused on doped ruthenium perovskites, confirm that the insertion of ruthenium in the structure of the lanthanum chromite presents a real benefit for the methane steam reforming. The electrochemical properties of La(Sr)CrO3–δ , either pure and doped with manganese, show that the perovskite films can be potential electrodes, depending on their doping, for hydrogen anodic oxidation in solid oxide fuel cells. 相似文献
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以大面积电池和千瓦级电堆为对象,研究了温度、燃料成分、流量等对阳极支撑型电堆性能的影响。结果表明:温度的影响最大,复数阻抗谱中高频弧对应的活化能最高;欧姆阻抗的活化能较低,表明其不全是离子电导的电阻,还包括双极板的表面电阻和可能的接触电阻。利用干氢气燃料测试时,在开路电压附近表现出较大的活化极化,且其活化能很小,表明该活化极化的速率控制步骤并非是电荷转移过程,而是对应某种表面扩散过程。模拟重整气燃料测试过程中活化极化不明显,但开路电压较低,性能比氢气燃料差。随着电堆工作电流的增加,燃料尾气的温度增加,表现出明显的热效应。 相似文献
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A novel plasma-matrix reformer (PMR) was suggested for methane conversion into hydrogen-rich fuel. To demonstrate the possibility of reforming performance, characteristics of product gas and CH4 conversion were identified according to O2/C ratio, water vapor supply, reformed gas recirculation, and water feed in the recirculation gas affecting energy conversion and hydrogen production. When the reformed gas recirculation and water feed to the recirculation pipe were performed at the same time, hydrogen production and energy conversion efficiency were superior compared to the conventional reforming method. The optimal operating conditions of the PMR were determined. The obtained high energy conversion efficiency and hydrogen selectivity indicated the applicability to solid oxide fuel cell stacks for residential power generation. 相似文献
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Adding Ni-coated graphite particulates to a tape casting colloidal suspension is capable of creating a sintered solid oxide fuel cell anode with a critical percolation threshold for conductivity significantly lower than conventional anode materials. For example, conductivity at 800°C reached over 1200 Ω−1 ·cm−1 in these anodes at a Ni volume below the percolation threshold reported for conventional anode materials. This behavior was explained based on an "effective" Ni content, V Nieff , which includes the graphite portion of the particle. In the green tape, V Nieff controls the creation of a percolating network of Ni. However, when the graphite burns away, it leaves a percolated Ni network at a much lower volume fraction than would otherwise be required. 相似文献
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主要对SOFC阳极材料的最新研究进展进行综述。首先介绍了SOFC对阳极材料的基本要求,而后对目前各种阳极材料在性能方面的优势和不足进行了比较,其中较为详细地介绍了传统的金属陶瓷阳极和新型的钙钛矿型阳极的研究进展情况,最后对阳极材料的未来发展方向进行了展望。 相似文献
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以大面积电池和千瓦级电堆为研究对象,在确定的燃料成分、流量、和工作温度下,系统研究了电流阶梯变化、电流脉冲变化、电堆热启停以及冷热循环(冷启停)等工况下电堆的输出性能。结果表明:在小电流区域,电堆的电压和功率能够快速跟踪电流变化;在大电流区域,电池的电压出现波动和弛豫,电堆的功率也出现弛豫。热启停实验结果表明,SOFC电堆对电流的on-off变化具有足够的耐受性,一定数量的热启停不会导致电堆性能的明显衰减。而冷热循环会导致应力释放,引起接触电阻变化,从而使电堆性能衰减,5次以上热循环可使应力释放趋于缓和。 相似文献