In this paper, fuel cell testing process was summarized. From the calibration of test station, parameters record and testing process, we analyzed the process and experiment condition which must be standardized in orde...
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In this paper, fuel cell testing process was summarized. From the calibration of test station, parameters record and testing process, we analyzed the process and experiment condition which must be standardized in order to obtain repeatable, reproducible and scaleable parameters of the performance and durability. Due to the process of fuel cell working is a complicated balanceable system including mass transfer, electrochemical reaction and thermo transfer etc, the fuel cell testing is consequentially a rigorous testing process. Every tache of it was restricted by the other, and every restricted factor will maybe influence the test results. So, a exhaustive testing protocol must be established.
This paper introduced the preparation of zinc oxide whiskers with different morphology. The result of SEM showed that one was multi-needle whiskers, the other was hexagonal rods. The result of the XRD indicated that t...
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This paper introduced the preparation of zinc oxide whiskers with different morphology. The result of SEM showed that one was multi-needle whiskers, the other was hexagonal rods. The result of the XRD indicated that the production structure was wurtzite, which was mixed with hydrocarbon. The results of SEM indicated that the mixture had an important effect on the the morphology of the whiskers.
The gas diffusion layer (GDL) durability of proton exchange membrane fuel cell (PEMFC) was reviewed. The testing methods and the characterization of the durability of GDL were summarized in this paper. The degradation...
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The gas diffusion layer (GDL) durability of proton exchange membrane fuel cell (PEMFC) was reviewed. The testing methods and the characterization of the durability of GDL were summarized in this paper. The degradation mechanisms of GDL were analyzed through discussion. The research trends of the GDL were proposed as well.
High alumina cement/graphite conductive composites were prepared by mold pressing at room temperature. Electrical conductivity was measured and the composite morphology was investigated by scanning electron microscope...
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High alumina cement/graphite conductive composites were prepared by mold pressing at room temperature. Electrical conductivity was measured and the composite morphology was investigated by scanning electron microscope (SEM). The heat stability and water content of conductive composites were also studied under proton exchange membrane fuel cell (PEMFC) operating temperature. The test results show that the percolation phenomenon is exist in the composite bipolar plate, the threshold value is 8%-10%;moreover, the composite bipolar plate has excellent heat stability and self- humidification.
Different humidification of proton exchange membrane fuel cells were investigated using PEM module of fluent software. Influence of different humidification degrees on performance of PEM fuel cell was studied, especia...
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Different humidification of proton exchange membrane fuel cells were investigated using PEM module of fluent software. Influence of different humidification degrees on performance of PEM fuel cell was studied, especially influence of Concentration polarization on PEM fuel cell performance was discussed in the high current density. 0%, 50% and 100% humidification of 80°C cathode gas were contrasted. The results showed that 100% humidification was better at low current density, while at high current density, 50% humidification was better. The relation between the performance of fuel cell and the distribution of O2 and H2O mol concentration on the interface between cathode diffusion layer and catalyst layer were analyzed. The results showed only partial regions of catalyst layer exist concentration polarization. Taking properly humidification can obtain higher performance in different current density.
This paper modeled a single cell with active area of nearly 50 cm2 by the CFD software of Fluent and discussed the influence of cooling water on the temperature distribution of membrane. The results show that most of ...
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This paper modeled a single cell with active area of nearly 50 cm2 by the CFD software of Fluent and discussed the influence of cooling water on the temperature distribution of membrane. The results show that most of the cooling water's temperature is low, the effect of heat exchange is bad;At the high current density, cooling water with the same flow direction of reactant gas has better effect on improving temperature distribution in the fuel cell. Increasing overall flow velocity and depressing the inlet temperature of cooling water has little effect on improving temperature distribution.
Metal-N-H is considered as one of the most-potential hydrogen storage materials as on-board applications for its high gravimetric hydrogen content at relatively gentle condition. The research development of conversion...
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Metal-N-H is considered as one of the most-potential hydrogen storage materials as on-board applications for its high gravimetric hydrogen content at relatively gentle condition. The research development of conversion from Li-N-H to Mg-N-H is presented, two types of possible reaction mechanisms are discussed and three amide-synthesizing methods are introduced. The unsolved problems of development and application of the Metal-N-H system are also generalized.
Novel magnetorheological (MR) suspensions were obtained by adding CoFe2O4 nanoparticles with different diameters and coercive forces, which were prepared in the CTAB/n-octane/n-butanol/water inverse microemulsions, in...
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Novel magnetorheological (MR) suspensions were obtained by adding CoFe2O4 nanoparticles with different diameters and coercive forces, which were prepared in the CTAB/n-octane/n-butanol/water inverse microemulsions, into the traditional MR suspensions based on carboxylic iron particles. The MR properties of the MR suspensions were measured as functions of the weight fractions and the diameters and magnetic properties of the CoFe2O4 nanoparticles. The results showed that the MR effects for the modified MR suspensions increased obviously with decreasing the diameters from 50 nm to 20 nm, or increasing the coercive force of the CoFe2O4 spheroid nanoparticles. Increasing the content of CoFe2O4 nanoparticles, the MR effect exhibited a maximum value at 1.2wt%.
The α-Fe fibers were prepared successfully by the method of electrodepositing in porous alumina template. The results indicated that the diameter of the fibers was 300 nm and the length of them increased along with t...
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The α-Fe fibers were prepared successfully by the method of electrodepositing in porous alumina template. The results indicated that the diameter of the fibers was 300 nm and the length of them increased along with the electrodepositing time increasing. The saturation magnetization per m2 of the iron fibers increased with the increasing of the length/diameter ratio, but the coercive field decreased.
Microstructures of highly compact IrO2 films, deposited on Si (100) substrates by pulsed laser deposition of Ir target at different oxygen partial pressures, were characterized with X-ray diffraction (XRD), Raman spec...
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Microstructures of highly compact IrO2 films, deposited on Si (100) substrates by pulsed laser deposition of Ir target at different oxygen partial pressures, were characterized with X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and atomic force microscopy (AFM).The results show that the films, grown at an oxygen partial pressure of 20 Pa and at a substrate temperature in the range of 250°-500°C, are polycrystalline and that as the substrate temperature rises, IrO2 surface becomes rougher with bigger grains.
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