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6 results on '"Mei, Qiang"'

4. Experiment assessment of hydrogen production from activated aluminum alloys in portable generator for fuel cell applications

Author

Fen Xu, Lixian Sun, and Mei Qiang Fan

Subjects
Materials science, Hydrogen, Cryo-adsorption, Slush hydrogen, Water flow, Mechanical Engineering, High-pressure electrolysis, Metallurgy, chemistry.chemical_element, Building and Construction, Pollution, Industrial and Manufacturing Engineering, General Energy, chemistry, Hydrogen fuel enhancement, Electrical and Electronic Engineering, Compressed hydrogen, Civil and Structural Engineering, Hydrogen production
Abstract

An experiment assessment of hydrogen production from activated aluminum alloy in portable hydrogen generator for fuel cell applications was investigated. The optimum hydrogen capacity of the high–reactive Al–Bi–NaCl alloys (the abbreviation of milled material of aluminum, bismuth and NaCl particles) is about 9–9.4 wt.%, meeting the targets (9 wt.%) of the US Department of Energy in 2015. Hydrogen production rate can be controlled via controlling the water flow rate in the generator, being 1.369–6.198 L hydrogen/min while the water flow rate ranges in 5–20 mL/min. The larger water flow rate often leads to higher temperature and results in unsafety in the generator as the hydrolysis reaction of aluminum alloy and water releases 15 kJ/g heat. However, the heat problem can be successfully eliminated by using effective cooling stytles, which enable the maximum temperature of Al–H2O mixture (the abbreviation of hydrolysis products of aluminum alloy in water) controlled less than 474 K even though the water flow rate is 20 mL/min. Therefore, the experiment results show that the portable hydrogen generator from aluminum alloy could supply the CO2–free, high hydrogen capacity and safe hydrogen for fuel cell applications.

Published
2010

6. Superior hydrogen storage properties of MgH2–10 wt.% TiC composite

Author

Fan, Mei-Qiang, Liu, Shu-sheng, Zhang, Yao, Zhang, Jian, Sun, Li-Xian, and Xu, Fen

Subjects
*METALLIC composites, *HYDROGEN, *MAGNESIUM compounds, *HYDRIDES, *TITANIUM carbide, *NANOPARTICLES, *HYDROGENATION, *DEHYDROGENATION, *DIFFUSION
Abstract

Abstract: The hydrogen storage performance of MgH2–10 wt.% TiC composite was investigated. The additive TiC nanoparticle led to a pronounced improvement in the de/hydrogenation kinetics of MgH2. The composite could dehydrogenate 6.3 wt.% at 573 K while the milled MgH2 only released 4.9 wt.% of hydrogen at the same condition. The improvement came from that the activation energy of dehydrogenation was decreased from 191.27 kJ mol−1 to 144.62 kJ mol−1 with the TiC additive. The MgH2–10 wt.% TiC composite also absorbed 6.01 wt.% (or 5.1 wt.%) of hydrogen under 1 MPa H2 at 573 K (or 473 K) in 3000 s. Even at 1 MPa H2 and 373 K, it could absorb 4.1 wt.% of hydrogen, but milled MgH2 could not absorb hydrogen at this condition. Additionally, the composite had good cycling stability, and its hydrogen capacity only decreased 3.3% of the first run after 10 de/hydrogenation cycles. The improved hydrogen storage properties were explained to the TiC particles embedded in the MgH2, which provided the pathways for the hydrogen diffusion into the MgH2–10 wt.% TiC composite. [Copyright &y& Elsevier]

Published
2010
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