(La_xNd_y)_(0.90)Mg_(0.10)Ni_(3.09)Mn_(0.12)Co_(0.60)Al_(0.13)贮氢合金自放电性能研究  

Study on Self-discharge Property of (La_xNd_y)_(0.90)Mg_(0.10)Ni_(3.09)Mn_(0.12)Co_(0.60)Al_(0.13) Hydrogen Storage Alloys

作　　者：刘义 商国云[2] 蒿建生[1,3] 朱惜林[1,2] 韩树民[2,3] 

机构地区：[1]内蒙古稀奥科贮氢合金有限公司,内蒙古包头014030 [2]燕山大学环境与化学工程学院,河北秦皇岛066004 [3]亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《稀土》2010年第1期16-22,共7页Chinese Rare Earths

基　　金：国家自然科学基金项目资助(20673093)

摘　　要：为了提高La-Mg-Ni基贮氢合金的荷电保持率,本文研究了La/Nd比的变化对La-Mg-Ni基贮氢合金自放电性能的影响。随着Nd替代La量的增加,(LaxNdy)0.9Mg0.10Ni3.09Mn0.12Co0.60Al0.13(x/y=5,4,3,2,1)合金的荷电保持率先增大后减小,当x/y=4时,其荷电保持率达到最大值80.8%(318 K)。合金电极贮存后,FESEM-EDS和XRD分析表明,合金颗粒表面形成了Mg(OH)2和Nd(OH)3。P-C-T曲线和Tafel极化测试表明,随着Nd含量的增加,金属氢化物的稳定性呈现先增加后降低和腐蚀电流先减小后增大的规律。In order to improve the charge retention rate（CRT） of the La-Mg-Ni-based hydrogen storage alloys,the effects of La/Nd on the self-discharge property of La-Mg-Ni-based hydrogen storage alloys were studied in this paper.The CRT of（LaxNdy）0.90Mg0.10Ni3.09Mn0.12Co0.60Al0.13（x/y=5,4,3,2,1） alloy electrodes first increased and then decreased with the partial substitution of Nd for La,and the CRT come to the highest value 80.8% when x/y is 4.XRD and FESEM-EDS revealed that Mg（OH）2 and Nd（OH）3 were formed on surface of the alloy particles after storage under an open-circuit condition.P-C-T curves and Tafel polarization tests indicated that the stability of alloy hydride first increased and then decreased,and the Icorr first decreased and then increased.

关 键 词：贮氢合金 自放电性能 热力学性能 镍/金属氢化物电池 

分 类 号：TG139.7[一般工业技术—材料科学与工程] O614.33[金属学及工艺—合金]