Study On Ti-V Based Wide-Temperature Range Hydrogen Storage Alloys And Hydrogen Storage Devices

Exploring an economical,efficient and feasible storage and transportation mode of hydrogen is a key project for the current development of hydrogen energy.High-level security solid-state hydrogen storage material has been considered as one of the most promising ways for storage and transportation of hydrogen.Although there are various kinds of reported hydrogen storage materials,hydrogen storage alloy is still the main development and application orientation including rare-earth series,Ti-Fe series,Vbased solid solution alloy and Mg-based etc..Nevertheless,low reversible capacity,rigorous hydrogen-desorption temperature and poor cycle stability may restrict utilization of the above materials.At the same time,a large amount of heat was released during hydrogen absorption process.Hydrogen storage tanks need to absorb heat from the outside during hydrogen desorption process.Therefore,the design work of solid-state hydrogen storage system is a relatively complicated.In addition,one kind of hydrogen storage materials has different properties and different requirements for hydrogen storage conditions.The main work content and purpose of this project is to break through the technical bottleneck of solid-state hydrogen storage materials in the process of hydrogen storage and transportation,and to carry out the research on advanced and applicable hydrogen storage materials and put them into practice in the face of the major demand of hydrogen energy development.The main research contents and results are as follows:(1)The phase composition and structure of the alloy were studied with doping Y.The activation and kinetic characteristics of the alloy were studied as well.The hydrogen storage characteristics at room temperature and high temperature were investigated.The alloys containing Y are all composed of C14-Laves phase and Y phase and hexagonal structure of the BCC main phase.The maximum hydrogen absorption capacity of Ti0.9V1.1Mn0.9Y0.1 alloy is 3.54 wt.%,and the effective hydrogen capacity of the alloy is 3.05 wt.%at 473 K and 0.1 MPa cut-off pressure.(2)The Y and Cr co-doping system was investigated.It was found that the introduction of Cr element could increase the BCC phase abundance and hydrogen absorption capacity of Ti-V-Mn-Y alloy.The maximum hydrogen absorption capacity of Ti0.9Y0.1V1.1Mn0.8Cr0.1 alloy is 3.54 wt.%,and the effective hydrogen capacity of the alloy is 2.53 wt.%at 423 K and 0.1 MPa cut-off pressure.(3)Low-cost mass production technology and performance test of rare earth doping Ti-V-Fe-Mn-Y solid solution hydrogen storage alloy were carried out by using cheap vanadium source.The microstructure analysis of the alloy shows that the inductionmelting samples are basically the same as the small samples prepared by arc-melting.The addition of rare earth element Y can weaken the adverse effects of impurities in vanadium-ferro alloy.Based on the replacement of V-Fe alloy,the hydrogen absorption capacity of the solid solution alloy decreased slightly,but it can greatly reduce the preparation cost of the solid solution alloy.(4)According to the hydrogen absorption and desorption characteristics of solid-state solution alloys,two kinds of hydrogen storage tanks with multi-tube structure and layered structure were designed and manufactured.The hydrogen storage capacity can reach 0.59 kg H2 for each one.Under the condition of 2 MPa hydrogen supply,the maximum amount of hydrogen absorption in the container can reach 2.61 wt.%,and the time of hydrogen absorption reaching saturated can be controlled within 10 min.