CHARACTERISTICS AND APPLICATION PROSPECTS OF VANADIUM-BASED HYDROGEN STORAGE ALLOYS
Vanadium-based alloy is a good hydrogen storage material because of its high hydrogen storage capacity,mild hydrogen storage and desorption reaction conditions,excellent reaction kinetics properties of hydrogen storage and good anti-pulverization properties.However,vanadium-based hydrogen storage alloys have some disadvantages,such as low hydrogen storage platform,low reversible hydrogen storage capacity,obvious hysteresis,poor cycle stability,high cost of raw materials and high metal cost,it restricts the further application of vanadium-based hydrogen storage alloys.So far,researchers have modified the vanadium-based hydrogen storage materials by many ways,such as elemental composition and crystalline phase structure,to optimize the performance of vanadium-based hydrogen storage materials.Based on this,the research progress of doping Ti,Cr,Mn,Zr and other chemical element and the optimization of particular conditions for hydrogen storage alloys were briefly reviewed in order to reduce the platform pressure of hydrogenation and increase the reversible hydrogen storage capacity of materials.The effects of element replacement,material heat treatment,and alloy activation pretreatment on hydrogen storage properties of vanadium-based hydrogen storage alloys were emphasized.The future development prospect of vanadium-based hydrogen storage alloys was prospected.
hydrogen storagevanadium-based alloydoping metal elementheat treatmentsurface treatment
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