Mohammad Banyan
Kuwait Institute for Scientific Research, Kuwait
Title: Application of cold spraying technique for catalyzing cold rolled metal rods with Ni for use as a metal hydride solid storage medium
Biography
Biography: Mohammad Banyan
Abstract
Utilization of hydrogen energy in real applications comes with many challenges like solving problems faced in the field of hydrogen storage. Solid state hydrogen storage is suitable for overcoming some of the problems present in other storage methods. Mg metal is a cheap solid-state hydrogen storage medium with high hydrogen capacity and operational cost effectiveness. Because of its poor hydrogenation/dehydrogenation kinetics and high values of decomposition temperature and apparent activation energy, MgH2 has not been employed in real fuel cell applications yet. The present work reports for the first time application of cold spray coating for doping plastically deformed Mg-strips by different concentrations of fine Ni powders. For present study, Mg rods were cold-rolled for 300 passes and then coated by Ni fine powders, using a cold spray process operated at 150_C under high argon gas pressure. The Ni powders were pelted into Mg-substrate through a high-velocity jet at a speed of 500 m/s. Under these preparation conditions, Ni powders were plastically deformed at the surface of Mg strips to create numerous pores and cavities which worked as a hydrogen diffusion gateway. The as-coated Mg sheets with 3-Ni layers (5.28 wt%) possessed good hydrogenation/dehydrogenation kinetics, implied by a short absorption/desorption time (5.1/11 min) of 6.1 wt% hydrogen at 150_C/10 bar and 200_C/200 mbar, respectively. The fabricated solid-state hydrogen storage nanocomposite strips revealed good cyclability of achieving 600 cycles at 200_C without failure of degradation.