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Microstructure and electrochemical properties of V_(1.95)Ti_(0.5)Cr_(0.5)NiO_(0.05)Al_xFe_y(x,y=0-0.05)alloys

To obtain V-based hydrogen storage alloys with high discharge capacity and good cycle stability,the V1.95Ti0.5Cr0.5NiO0.05AlxFey(x,y=0-0.05)alloy electrodes were prepared by induction melting,and the effect of Al and Fe contents on the microstructure and electrochemical property was investigated systematically.X-ray diffraction(XRD)indicates that all of the alloys mainly consist of a V-based solid solution phase with a BCC structure and a TiNi-based secondary phase.The electrochemical measurements show that the addition of Al improves the maximum discharge capacity,high rate discharge ability,exchange current density and diffusion coefficient of hydrogen while the increase of the Fe content improves the cycle stability.