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Metal hydrides show potential under stress
, Article Metal Powder Report ; Volume 64, Issue 7 , 2009 , Pages 24-26,28 ; 00260657 (ISSN) ; Kaflou, A ; Simchi, A ; Sharif University of Technology
2009
Abstract
Work carried out in Iran seems to indicate that nanostructured materials may hold a key to fuel storage in a future hydrogen economy.... © 2009 Elsevier Ltd. All rights reserved
Modeling and Survey of the Hydrogen Storage System Using Metal Hydride Technology in Hybrid Vehicles
, M.Sc. Thesis Sharif University of Technology ; Roshandel, Ramin (Supervisor) ; Moshfegh, Alireza (Supervisor)
Abstract
Relying on current fuels and technologies in vehicle industry in recent years has led to an enormous challenge such as air pollution, climate change and energy security. In the other hand, fossil fuel reservoirs are being depleted with an intensive rate. Nowadays, hydrogen, as a substitute for current fuels and hybrid, fuel cell and electric vehicles, as substitutes for current vehicular technologies are under research and development. Because of abundant advantages such as high efficiency and long cycle life, no depreciation for parts and scalability, fuel cell vehicles is of interest for many car manufacturers throughout the world and lots of them have demonstrated their prototype fuel...
The Effect Of Using Heat Pipes On Heat Management In Pem Fuel Cell- Metal Hydride System
, M.Sc. Thesis Sharif University of Technology ; Roshandel, Ramin (Supervisor) ; Shafii, Mohammad Behshad (Co-Advisor)
Abstract
On-board hydrogen storage systems (as a substitute for fossil fuels) employing high-pressure metal hydrides, promise advantages including high volumetric capacities and cold start capability. In this project, we discuss the development of a system simulation model in Matlab/Simulink platform. Transient equations for mass balance and energy balance are presented. During driving, the bed requires external heat source, which is planned to be supplied by rejected heat from proton-exchange membrane (PEM) fuel cell. Therefore, this study develops a system-level dynamic model of a PEM fuel cell that is capable of characterizing the mixed effects of temperature, gas flow and capacitance, with...
Synergetic effect of Ni and Nb2O5 on dehydrogenation properties of nanostructured MgH2 synthesized by high-energy mechanical alloying
, Article International Journal of Hydrogen Energy ; Volume 34, Issue 18 , 2009 , Pages 7724-7730 ; 03603199 (ISSN) ; Kaflou, A ; Simchi, A ; Sharif University of Technology
2009
Abstract
Nanostructured MgH2-Ni/Nb2O5 nanocomposite was synthesized by high-energy mechanical alloying. The effect of MgH2 structure, i.e. crystallite size and lattice strain, and the presence of 0.5 mol% Ni and Nb2O5 on the hydrogen-desorption kinetics was investigated. It is shown that the dehydrogenation temperature of MgH2 decreases from 426 °C to 327 °C after 4 h mechanical alloying. Here, the average crystallite size and accumulated lattice strain are 20 nm and 0.9%, respectively. Further improvement in the hydrogen desorption is attained in the presence of Ni and Nb2O5, i.e. the dehydrogenation temperature of MgH2/Ni and MgH2/Nb2O5 is measured to be 230 °C and 220 °C, respectively. Meanwhile,...