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本文针对配备三通道蛇形阳极流场的液态进料直接甲醇燃料电池阳极两相流及电池性能开展了实验研究.液态进料的直接甲醇燃料电池阳极流床内会形成二氧化碳气泡与甲醇溶液构成的两相流系统,其两相流特性受到电池流道设计、运行工况和工作角度的影响,并同时影响燃料电池的性能.本文设计了三通道蛇形流场,通过可视化实验得到直接甲醇燃料电池三通道蛇形阳极流场内的两相流特性随电流密度变化的规律,并研究了燃料电池在不同旋转角度下的两相流特性和电池性能.实验结果表明:在不同的旋转角度下,电池都体现出较好的工作性能. 相似文献
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燃料电池概述 总被引:15,自引:0,他引:15
燃料电池在固定与分散电站、交通运输、移动电源等方面广阔的应用前景现已受到许多研究单位和公司的广泛关注,文章简要介绍了几种主要类型燃料电池(碱性燃料电池alkaline fuel cell,AFC)、磷酸燃料电池(phosphoric acid fuel cell,PAFC)、熔融碳酸盐燃料电池(molten carbonate fuel cell,MCFC)、固体氧化物燃料电池(solid oxide fuel cell,SOFC)、质子交换膜燃料电池(proton exchange membrane fuel cell,PEMFC)、直接醇类燃料电池(direct alcohol fuel cell,DAFC)的特点、研究状况、市场需求和技术挑战,初步探讨了我国燃料电池研究开发的前景。 相似文献
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质子交换膜燃料电池动态特性实验研究 总被引:2,自引:0,他引:2
质子交换膜燃料电池动态特性的研究对于实际应用来说非常重要,实验研究了质子交换膜单体燃料电池在负载动态变化及启动过程中性能的响应.基于计算机控制的负载变化,得到了在不同进气加湿程度下电池性能在负载突变时的响应和在启动工况中的变化,结果表明电池电流对电压动态变换的响应很迅速,突变工况下电流密度出现了过增现象,高加湿程度的电池在设计启动过程中获得了更好的性能. 相似文献
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《Current Applied Physics》2014,14(5):672-679
Carbon dioxide is one of the greatest concerns worldwide, since it is not only a major greenhouse gas but also expected to be an important, sustainable resource for fuels and chemicals. The electrochemical conversion of carbon dioxide, based on solid electrolyte membrane reactors, has the promise to overcome the limitations of the conventional catalytic reactors such as the limited conversion and kinetics, relatively low selectivity and high energy consumption. In this review, electrocatalysts and solid oxide electrolytes, both proton and oxide ion conductors as core materials in an electrochemical ceramic membrane reactor have been reviewed and particular emphasis is placed on their application to synthesize carbon monoxide and hydrogen. 相似文献
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Shao-Ju Shih Ying-Ying Wu Chin-Yi Chen Chin-Yang Yu 《Journal of nanoparticle research》2012,14(5):879
Ceria-based materials are used in industrial applications such as catalyst supports, carbon monoxide reduction catalysts,
and solid oxide fuel cell electrolytes. Various applications require different morphological particles. The ceria particles
with various morphologies from the precursors of cerium(III) acetate hydrate, cerium(IV) nitrate hydrate, and cerium(IV) ammonium
nitrate were prepared by spray pyrolysis (SP) because SP has the potential for simple and continuous process. The precursor
behaviors and the particle morphologies were characterized by thermogravimetric analysis and by transmission electron microscopy.
Four main morphologies of solid spherical, hollow spherical with a single pore, hollow concave, and hollow spherical with
multiple pores were observed. The experimental results suggest that the morphological formation mechanism is highly correlated
with the factors of precursor solubilities, solvent evaporation rates (droplet diameters), and precursor melting temperatures.
In addition, total concentrations of cerium(III) in the ceria particles from various precursors were examined using X-ray
photoelectron spectroscopy. 相似文献
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The behavior of sodium oxide bronzes in contact with sodium-conducting solid electrolytes in atmospheres of oxygen, carbon
dioxide, hydrogen sulfide, and humid air was investigated. The exchange currents at the NaxCoOy/NASICON interface was determined. It is shown that among the sodium-cobalt oxide bronzes the β-phase of the composition Na0.6CoO2 is the most reversible one (exchange current 236 μA/cm2).
Paper presented at the 1st Euroconference on Solid State Ionics, Zakynthos, Greece, 11–18 Sept. 1994 相似文献
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An overview of ion transport in lithium-ion inorganic solid state electrolytes is presented, aimed at exploring and designing better electrolyte materials. Ionic conductivity is one of the most important indices of the performance of inorganic solid state electrolytes. The general definition of solid state electrolytes is presented in terms of their role in a working cell(to convey ions while isolate electrons), and the history of solid electrolyte development is briefly summarized. Ways of using the available theoretical models and experimental methods to characterize lithium-ion transport in solid state electrolytes are systematically introduced. Then the various factors that affect ionic conductivity are itemized, including mainly structural disorder, composite materials and interface effects between a solid electrolyte and an electrode. Finally, strategies for future material systems, for synthesis and characterization methods, and for theory and calculation are proposed, aiming to help accelerate the design and development of new solid electrolytes. 相似文献
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This paper gives an overview of the materials transport processes which occur in oxide solid electrolytes subjected to a generalized
thermodynamical potential gradient. The general equations allowing to describe the transport processes on the anionic and
cationic sublattices are given. Kinetic demixing processes and microstructural changes leading to surface instabilities are
analysed. Experimental results obtained with yttria-doped zirconia and gadolinium doped ceria illustrate the importance of
these phenomena on the transport properties of the materials but also on their long term stability in operating conditions.
Paper presented at the Patras Conference on Solid State Ionics — Transport Properties, Patras, Greece, Sept. 14–18, 2004. 相似文献
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Energy storage research has drawn much attention recently due to increasing demand for carbon neutral electrical energy from renewable energy sources such as solar, wind, and hydrothermal. Various electrochemical energy storage and conversion technologies are being considered for their integration into smart grid systems, of which batteries seem to play a vital role due to their wide range of energy densities. In this review, we provide the current status and recent advances in solid-state (ceramic) electrolytes based on inorganic compounds for all-solid-state batteries. This paper is specifically focused on the fundamentals, materials, and performances of solid electrolytes in batteries. A wide spectrum of inorganic solid-state electrolytes is presented in terms of their chemical composition, crystal structure, and ion conduction mechanism. Furthermore, the advantages and main issues associated with different types of inorganic solid electrolytes, including β-alumina, NASICON and LISICON-type, perovskites, and garnet-type for all-solid-state batteries are presented. Among these solid electrolytes, Zr and Ta-based Li-stuffed garnets exhibit high Li-ion conductivity, electrochemical stability window (up to 6 V/Li at room temperature), and chemical stability against reaction with molten elemental Li. However, their stability under humidity and carbon dioxide should be improved to decrease the fabrication and operational costs. 相似文献
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Polymeric solid electrolytes were prepared from inorganic lithium salts, endo-acetylated oligo(ethylene oxide) and polyanions with perfluoro(ethylene) main chain. High ionic conductivity was found when these ternary hybrids took micro-segregated structures with continuous cylindrical conduction columns of lithium salt-oligo(ethylene oxide) in the sea of perfluoro-poly(electrolytes). The ionic conductivity of more than 10?5 S/cm was established at room temperature without affecting the processibility and flexibility of resulting hybrid films. 相似文献
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The self-diffusion coefficient for a stochastically nonuniform thermodynamic system is represented as the mean value of the
transition rates. A model for the ionic transport in solid oxide electrolytes is proposed. The existence of percolation cluster
of the doping cations is taken into account in the model. The maximum of the concentration dependence of the ionic conductivity
is explained by the blocking effect and random distribution of traps. The problem of inconsistency of theoretical and experimental
values for the pre-exponential factor is discussed and an approach is proposed to overcome this disagreement. 相似文献
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In this letter, we demonstrate that luminance efficiency of polymer light emitting diode can be significantly enhanced by
adding a small amount of ionic solid electrolytes. Heterojunction polymer device, consist of MEH-PPV, C60, methanofullerene([6,6}-phenyl C61-butyric acid methyl ester) PCBM and/or PEO as the active materials. It has been found
that blending of ionic solid electrolytes, such as polyethylene oxide into active layer, enhances the luminance efficiency
of polymer device. It is believed that the optimized polymer morphology improves carrier mobility of MEH-PPV.
Paper presented at the Third International Conference on Ionic Devices (ICID 2006), Chennai, Tamilnadu, India, Dec. 7–9, 2006. 相似文献