Ti_(0.10)Zr_(0.15)V_(0.35)Cr_(0.10)Ni_(0.30)+5wt% LaNi_5复合储氢合金的电化学性能与协同效应  

Electrochemical Characteristics and Synergetic Effect of Ti_(0.10)Zr_(0.15)V_(0.35)Cr_(0.10)Ni_(0.30)+5wt% LaNi_5 Composite Hydrogen Storage Alloy

作　　者：王艳芝[1,2] 赵敏寿[1,2] 翟静[1] 刘潘[1] 彭锂[1] 沈文卓[1] 马维克[1] 

机构地区：[1]燕山大学河北省应用化学重点实验室,秦皇岛066004 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《无机化学学报》2011年第11期2217-2224,共8页Chinese Journal of Inorganic Chemistry

基　　金：河北省自然科学基金(No.B2011203074)资助项目

摘　　要：为了改善钛钒基固溶体合金的电化学性能,利用两步电弧熔炼法制备复合储氢合金Ti0.10Zr0.15V0.35Cr0.10Ni0.30+5wt%LaNi5,X-射线衍射(XRD)和场发射扫描电镜-能谱(FESEM-EDS)显示:复合储氢合金的主相是体心立方结构的钒基固溶体相和六方结构的C14 Laves相,复合过程中生成了第二相。电化学测试结果表明:复合合金电极的P-C-T特征、活化性能、最大放电容量、循环稳定性、低温放电性能和动力学特性均较母体合金有显著改善。复合合金电极的活化周期数为5,最大放电容量为353.9 mAh.g-1,233 K时低温放电能力为50.26%。该复合合金电极的最大储氢容量、平台压、电荷转移电阻和交换电流密度均存在协同效应;在任意循环、在高/低温下以及在高倍率放电过程中,该复合合金电极的放电容量均存在协同效应。Ti0.10Zr0.15V0.35Cr0.10Ni0.30＋5wt% LaNi5 composite hydrogen storage alloy was prepared by two-step arc melting in order to improve performance of Ti-V-based solid solution alloy.X-ray diffractometry（XRD） and field emission scanning electron microscopy-energy dispersive spectroscopy（FESEM-EDS） show that the main phase of the composite alloy is composed of V-based solid solution phase with a BCC structure and C14 Laves phase with hexagonal structure,while secondary phase also exists in the composite alloy.Electrochemical test shows that P-C-T properties,activation performance,maximum discharge capacity,cyclic stability,low temperature dischargeability and kinetics properties of the composite alloy are significantly improved.The activation cycle number and the maximum discharge capacity of the composite alloy are 5 cycles and 353.9 mAh·g-1,respectively,and the low temperature discharge ability is 50.26% at 233 K.Synergetic effect appears in the maximum hydrogen absorption capacity,plateau pressure,the charge-transfer resistance and the exchange current density.The synergetic effect of the discharge capacity appears in cycles,high/low temperature and high rate discharge process.

关 键 词：钛钒基固溶体 复合储氢合金 电化学性能 协同效应 

分 类 号：O646.2[理学—物理化学]