Abstract: Microstructural characteristics and electrochemical properties of Mg40Al60 hydrogen storage alloy prepared by mechanical alloying (MA) method were studied by XRD, discharge capacities, polarization curves and electrochemical impedance spectroscopies(EIS). The intensities of XRD peaks become weak and XRD peaks have a broadening with the increment of ball milling time due to fine grain size and increased internal stress. The discharge capacities of the alloy increase before the alloyed powders were milled for 10h, but they decrease after the alloyed powders were milled for 10h with the increment of ball milling time. The discharge capacities are highest when the alloyed powders were milled for 10h. There are passive phenomena in polarization curves. The corrosion current densities increase with time at the beginning of ball milling and then decrease. The electrochemical impedance spectroscopies(EIS) are composed of a single capacitive loop and the electrode reaction is controlled by charge transfer at alloy/electrolyte interface.
Abstract: The sulfur-iodine (SI) cycle, thermochemical water splitting using heat energy from nuclear, is one of the most promising methods for massive hydrogen production. For continuous operation of Bunsen reaction section in SI process, the reactants (SO2, I2 and H2O) were fed to the reactor and the products (a H2SO4 phase and a HIx phase) were sent to storage tanks continuously during the reaction. In this study, we investigated the phase separation characteristics of continuous Bunsen reaction on the reactor shape and temperature. It was found that the reactor shape has little affected on the composition of Bunsen products. It was also observed that the phase separation characteristics of the continuous Bunsen reaction were similar to those for the semi-batch Bunsen reaction.
Abstract: In the present work, the aqueous slurry containing 30 wt% solid aluminum particles was prepared, using paraffin oil and oleic acid dispersant and surface active agent respectively. The results showed that no obvious aluminum particle sediment was observed even after being kept it at room temperature in air up to 15 days. The hydrogen generator based on the reaction of the aluminum slurry and sodium hydroxide aqueous solution was manufactured and could supply a maximum hydrogen flow rate of 20 NL/min. The dew point of the hydrogen from the generator was lower than -40oC, indicating the high purity of the as-obtained hydrogen. As expected the X-ray diffraction patterns revealed that the byproduct was bayerite.
Abstract: The main materials of polymer electrolyte membrane fuel cell (PEMFC) are carbon (C) and Stainless Steel (Fe). The dynamic current of PEMFC will cause nonuniform distribution of current density in these materials. Simple models which materials are carbon (C) and Stainless Steel (Fe) are used in testing. A testing device using electromagnetic method was set up to detect the induced electromotive force in models. Theoretical calculations using electromagnetism and mathematics are set up to calculate the current density distribution of models. It is shown from the comparison between calculated values of the formula and measured values that the dynamic current of PEMFC will cause skin effect.
Abstract: Combination natural conditions and water pollution of the Tai Lake Basin, Mainly by contrast analysis about the water pollution governance and so on, summarized the experience lesson about the water pollution governance of Tai Lake basin, and while drawing on the governance experience of Thames River basin, proposed targeted suggestions about governance of Tai Lake basin.
Abstract: In order to reduce production cost of making H2, one of the key points was to reduce Pt loading in Pt/C catalytic electrode. In our study, a new type of Pt/C membrane electrodes -- PtCu/C (abbr. P), PtCuLaOx/C (abbr. PL), PtCu-LaOx/C (abbr. P-L), LaOx-PtCu/C (abbr. L-P), LaOx-PtCu-LaOx/C (abbr. L-P-L) and PtCu-LaOx-PtCu/C (abbr. P-L-P) composite multi-layer membrane electrodes -- would be raised, in which with developing different membranouslayer form and different La content homogeneously dispersed on the surface of carbonaceous substrates was manufactured by Ion Beam Sputtering (IBS) technology. The hydrogen evolution polarization curves of these electrodes were tested by tri-electrode system, and were calculated results of their exchange current density (i0) and decomposition voltage (Ed). It was found that PtCu-LaOx composite multi-layer membrane with Pt loading less than 0.05mg/cm2 (the electrode area) whose Ed and i0 was -0.227(V vs SCE) and 4.717mA/cm2 respectively in balanced condition.
Abstract: The electrochemical behavior of BH4- on Cu electrode in 1M NaOH was investigated by cyclic voltammetry(CV) in the potential range of -1.2V to 0.4V versus Hg/HgO. The CV results show that Cu electrode has obvious catalytic activities to the BH4- hydrolysis which belongs to ‘catalytic’ electrode materials. The BH4- electro-oxidation process on Cu is complex and it could associate with the BH4- hydrolysis reaction, followed by oxidation of the intermediate H, then, the intermediate product (e.g. BH3OH−) oxidized, and direct oxidation of BH4- at more positive potentials.
Abstract: The acquisition of the GM-Fisher Body was the example cited widely in the empirical studies of the firm theories. The theory of the firm boundaries based on the synthesis of the transaction cost and the firm capabilities explains that the acquisition is due to the higher measurement cost, the increasing transaction frequency and the GM’s lack less of the capability to make the car-body, asset specificity is not the main cause.
Abstract: Abstract. Xinjin technology group company is to provide professional electronics manufacturing services ( EMS ) Company. The main business is the assembly of PCB and small electronic products and packaging They are the main problem facing the enterprise that global oversupplies in the market, which includes cost saving, protection of the environment and improve efficiency.There are three primary aspects in this paper. They are electric circuit capacitance compensation, tin slag recycling and type U reconfigurable production line. They were to take the new technology, new production process to replace outdated., Profits were improved through these reform measures.
Abstract: In this work, the effect of the current-collector structure on the performance of a passive direct methanol fuel cell (DMFC) was investigated. Parallel current-collector (PACC) and other two kinds of perforated current collectors (PECC) were designed, fabricated and tested. The studies were conducted in a passive DMFC with active membrane area of 9 cm2, working at ambient temperature and pressure. Two kinds of methanol solution of 2 M and 4 M were used. Results showed that the PACC as anode current-collector has a positive effect on cell voltage and power. For the cathode current-collector structure, the methanol concentration of 2 M for PECC-2 (higher open ratio 50.27 %) increased performance of DMFC. But the methanol concentration of 4 M led to an enhancement of fuel cell performance that used PACC or PECC-2 as cathode current-collector.