无机材料学报2012，Vol.27Issue(5)：463-468,6.DOI:10.3724/SP.J.1077.2012.00463
Ti-V基固溶体/AB5型镧镁基合金复合储氢材料的结构与电化学性能
Structure and Electrochemical Characteristics of Ti-V-based Solid Solution/AB5-type La-Mg-based Alloy Composite Hydrogen Storage Material
摘要
Abstract
Composite hydrogen storage alloy Ti0.10Zr0.15V0.35Cr0.10Ni0.30 + 5wt% La0.85Mg0.25Ni45Co0.35Al0.15 was prepared by two-step arc melting. X-ray diffractometry (XRD) and scanning electron microscope-energy dispersive spec-troscopy (SEM-EDS) show that the main phase of the composite alloy consists of V-based solid solution phase with BCC structure and C14 Laves phase with hexagonal structure, while secondary phase also exists in the composite alloy. Electrochemical studies show that distinct synergetic effect appears during the composite process. The real maximum discharge capacity of the composite alloy electrode is 361.8 mAh/g at 303 K, and the low temperature dischargeability (LTD) of the composite alloy electrode is 4.05 times as high as that of the matrix alloy electrode at 233 K. The high rate dischargeability (HRD), the charge-transfer resistance (Rct) and the exchange current density (Io) of the composite alloy electrode are 26.87 % bigger, 37.25 mΩ lower and 115.45 mA/g higher than that of the matrix alloy electrode, respectively. The hydrogen diffusion coefficient (D) in the bulk of the composite alloy is 6.13 × 10-10 cm2/s bigger than that of the matrix alloy.关键词
钛钒基固溶体/复合储氢合金/电化学性能/协同效应Key words
Ti-V-based solid solution/ composite hydrogen storage alloy/ electrochemical characteristics/ synergetic effect分类
化学化工引用本文复制引用
王艳芝,赵敏寿..Ti-V基固溶体/AB5型镧镁基合金复合储氢材料的结构与电化学性能[J].无机材料学报,2012,27(5):463-468,6.基金项目
河北省自然科学基金(B2011203074) （B2011203074）
