贮氢合金La0.65Mg0.35Nix（x=3.0～3.5）高温电化学性能的研究  

Investigation on Electrochemical Properties of La_(0.65)Mg_(0.35)Ni_x(x=3.0～3.5) Hydrogen Storage Alloys at High Temperature

作　　者：春林[1] 盛丹[1] 熊玮[2,3] 孔繁清[2,3] 闫慧忠[2,3] 赵增祺[2,3] 

机构地区：[1]内蒙古大学化学化工学院,内蒙古呼和浩特010021 [2]稀土冶金及功能材料国家工程研究中心,内蒙古包头014030 [3]包头稀土研究院,内蒙古包头014030

出　　处：《金属功能材料》2009年第5期8-11,共4页Metallic Functional Materials

基　　金：国际科技合作项目(2006DFB52550);国家自然科学基金项目(20363001)

摘　　要：研究了La0.65Mg0.35Nix(x=3.0、3.1、3.2、3.3、3.4、3.5)稀土镁基贮氢合金电极的高温(333 K)放电性能。该系列合金电极在70 mA.g1放电电流密度下的高温放电容量随Ni含量的增加逐渐降低,x=3.0的合金在333K的放电容量(293.4 mAh.g-1)可以达到常温(298 K)放电容量的97.8%。333 K的电化学P-C-T曲线测试结果表明,随着Ni含量的增加,放氢平台明显变窄,吸/放氢平台的滞后增加,说明Ni含量的增加不利于改善合金电极的放电性能。腐蚀曲线测量结果表明,随着Ni含量的增加,合金的抗腐蚀性能逐渐减弱。The high temperature （333 K） discharge performances ofLa0.65Mg0.35Nix（x= 3.0, 3.1, 3.2, 3.3, 3.4, 3.5） hydrogen storage alloy electrodes was investigated. The high temperature discharge capacity of the alloy electrodes at 70 mA·g^-1 discharge current densities gradually decreases with increasing Ni content in alloys. The discharge capacity （293.4 mAh·g^-1 for the alloy of x=3.0 at 333 K could hold 97.8% of that at room temperature （298 K）. The electrochemical P C isotherms at 333 K show that with increasing Ni content in the alloys, the plateau region of the hydrogen desorption becomes narrower obviously and the hysteresis between the hydrogen absorption and desorption increases, which suggests that the increase of Ni content is not favorable to improve the discharge properties of the alloy electrodes. The corrosion curve measurements reveal that the anti-corrosion properties of the alloys gradually decrease with increasing Ni content.

关 键 词：RE-Mg-Ni系贮氢合金 高温电化学性能 P-C-T曲线 腐蚀 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TG146.4[金属学及工艺—合金]