Hydrogen-storage alloy

Abstract

In a hydrogen-storage alloy which is a high-entropy alloy having a molecular formula of Co u Fe v Mn w Ti x V y Zr z , the hydrogen-storage alloy is an alloy free from rare-earth elements and having a stable single C14 Laves phase structure. The hydrogen-storage alloy has a high capacity of absorbing and releasing hydrogen under ambient temperature and pressure and a high hydrogen-storage capacity at room temperature, so that the hydrogen-storage alloy can be used extensively in the fields of hydrogen storage, heat storage, heat pump, hydrogen purification, isotope separation, secondary battery and fuel cell without producing harmful polluted gases, and the hydrogen-storage alloy has high potential for the development of a green energy source.

What is claimed is: 
     
         1 . A hydrogen-storage alloy, having a molecular formula of Co u Fe v Mn w Ti x V y Zr z , wherein 0.5≦u≦2.0, 0.5≦v≦2.5, 0.5≦w≦2.0, 0.5≦x≦2.5, 0.4≦y≦3.0 and 0.4≦z≦3.0, and atomic percentages used for representing contents of the hydrogen-storage alloy indicating that the content of Co falls within the range from 9.0 to 28.6, and the remaining contents fall within the range from 14.3 to 18.2; or the content of Fe falls within the range from 9.0 to 33.3 and the remaining contents fall within the range from 13.3 to 18.2; or the content of Mn falls within the range from 9.0 to 28.6, and the remaining contents fall within the range from 14.3 to 18.2; or the content of Ti falls within the range from 9.0 to 33.3, and the remaining contents fall within the range from 13.3 to 18.2; or the content of V falls within the range from 9.0 to 33.3 and the remaining contents fall within the range from 13.3 to 18.2; or the content of Zr falls within the range from 7.5 to 37.5, and the remaining contents fall within the range from 12.5 to 18.5. 
     
     
         2 . The hydrogen-storage alloy of  claim 1 , wherein the hydrogen storage alloy is in a C14-Laves phase.