Transition-Metal-Ethylene Complexes As High-Capacity Hydrogen-Storage Media

Observed from the current state development of the Hydrogen storage materials, Hydrogen storage materials at internal and abroad from the current state of development,the United States National Institute of Standards and Technology led by Dr.Taner Yildirim of the research team found through the calculation of Ti and C₂H₄ small hydrocarbons to form a stable Coordinate structure,the composite material can absorption equivalent to 14%of the weight of the high theoretical hydrogen storage capacity.Hydrogen with the release of its thermal effects when the hydrogen release kinetics of small and relatively good performance characteristics,as a new concept of hydrogen storage materials has aroused international attention.Followed by the University of Virginia Professor Bellave Shivaram postdoctoral laboratory·Adam Phillips,a bunch of laser to titanium with ethylene gas in the evaporation, the formation of composite materials in the formation of a layer of thin film substrates.Then he will be at indoor temperature by adding hydrogen in this alloy and found that the weight of alloy increased by 14%,through experiments confirmed the theory.But the synthesis of complex and difficult high-volume production.Can explore the solution of ethylene-Titanium simple synthesis of the release of Ti and C₂H₄ hydrogenation,then has the potential to resource-rich and low-cost titanium compounds ethylene the first practical application of hydrogen storage materials and fuel cell-powered hydrogen source on Mobile.This research take Ti and C₂H₄ as a raw material,explores the new ethylene titanium compound the synthetic method and the way,first used magnetism to control the sputtering and the metal steam law has made the experimental synthesis to the titanium and the ethylene. Afterward through the introduction mechanical power chemistry method,namely carries on the synthesis to some material reacting system introduction mechanical energy to the titanium and the ethylene,the synthesis is under the ethylene atmosphere,the mechanical ball grinding synthesizes C₂H₄-Ti.Used XRD,TG-DSC,SEM,MS,and so on methods to study the ethylene and the titanium synthetic method systematically,synthesized the ball grinding parameter.And synthesizes C₂H₄-Ti to the ball grinding to put the hydrogen performance to carry on the test.By the mechanical ball grinding ethylene and the titanium,have studied the alloy electrode material and the ethylene ball grinding's organic gable.Obtains following findings based on the above work.Uses magnetism to control the sputtering and the metal steam law,as a result of the synthesis hard bargain,the synthesis carries on with difficulty.Uses Mechanically ball-milling gas-solid reaction to synthesizes C₂H₄-Ti,the synthesis system facilitates simply.The ball-milling time is 24 hours later,observes in the ball-milling pot also the residual part unnecessary ethylene titanium block,indicates the response completely evenly not.Along with ball-milling time's increase,the reactant cementation is fierce,in the ball-milling 24 hour test specimen's atlas obviously,exists basically by the polyethylene,indicated that the response has the polyethylene production,Ethylene Polymerization in the titanium powder-coated surface.Along with ball-milling time increase,after Ti and C₂H₄ union, the gable falls off in the superficial polymer.With HO[(CH2)4-O]nH clean surface polymer,after the clean product thermal analysis,still had weightlessness.Then ethylene and time titanium powder pellet ball-milling,titanium powder pellet when stave,finely ground particles and ethylene hybridization reunion together,ethylene titanium reunion pellet surface and ethylene chemical combination.In the ethylene titanium puts in the hydrogen thermogravimetry and the mass spectrum chart,in the indoor temperature～400℃sector's decomposition product the main composition is the hydrogen,when the heating temperature elevates other gas quantity increasesTi and C₂H₄ response to the formation of the hydrogen storage alloy film layer packet,in which powder panicles of Ti and C₂H₄ polymer surface layer appears to be the interface between the ethylene molecules and the hydrogen storage alloy Ti surface atoms combine chemical adsorption,which means that its interface has a strong binding force.Outer coating of polyethylene film with good resistance to inorganic alkali(KOH) of the corrosion,this phenomenon is the high discharge capacity of some basic but susceptible to corrosion in aqueous solution hydrogen storage alloy electrode materials to improve the longevity cycle of the role of electrode then pass into the ethylene LaNi_4.6Mn_0.5 alloy milling,testing the effect of its coating.