ELECTROCHEMICAL PROPERTIES OF Zr-V-Ni SYSTEM HYDROGEN STORAGE ALLOYS
(1.Department of Materials Science and Engineering,Zhejiang University, Hangzhou 310027, P. R. China
2.Department of Applied Chemistry,Zhejiang University of Technology, Hangzhou 310014, P. R. China)
2.Department of Applied Chemistry,Zhejiang University of Technology, Hangzhou 310014, P. R. China)
Abstract: The electrochemical properties of Zr-V-Ni system hydrogen storage alloys were investigated. In ZrV0.5Mn0.3Ni0.1T0.1(T=Ni, Co, Fe, Al) system alloys, higher content of V and Mn(i. e. (V+Mn)/AB2=0.8)brings forth more stable hydrides which have lower electrochemical capacities at room temperature. Meanwhile Al is a hydride-stabilizing element as well. The above alloys all have a capacity of about 350mAh· g-1by raising temperature to 328 K. The substitution of Ti for Zr obviously alleviated their hydride thermodynamic stability for Zr-Ti-V-Ni system alloys. During charging/discharging process, the preferential anodic oxidation of component elements such as Ti and V will degrade the reversible hydrogen storage ability. The result was explained by the study of XRD, SEM observation and EDS analysis.
Key words: Zr-V-Ni alloys alloying electrode performances