化学镀覆聚吡咯对LaNi3.81Mn0.30Co0.79Al0.10储氢合金电化学动力学性能的影响  

Effect of Chemically Deposited Polypyrrole on Electrochemical Kinetic Properties of LaNi3.81Mn0.30Co0.79Al0.10 Hydrogen Storage Alloy

作　　者：扈琳 李建平[1] 赵鑫[2] 李金华[1] 陈娇 HU Lin;LI Jian-ping;ZHAO Xin;LI Jin-hua;CHEN Jiao(School of Materials and Chemical Engineering,Xi＇ an Technological University,Xi＇ an 710021,China;Baotou Research Institute of Rare Earths,Baotott 014030,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021 [2]包头稀土研究院,内蒙古包头014030

出　　处：《稀土》2018年第4期34-42,共9页Chinese Rare Earths

基　　金：国家自然基金项目(51502233);西安工业大学校长基金(XAGDXJJ5011)

摘　　要：采用化学镀的方法在AB5型储氢合金La Ni3.81Mn0.30Co0.79Al0.10表面镀覆聚吡咯来改善合金电极的电化学性能。测试了镀覆后合金的微观形貌和其在不同镀覆温度（T=293 K,323 K,343 K）和不同镀覆时间（t=5 min,8 min,10 min）下的电化学性能。XRD分析表明,表面镀覆聚吡咯没有改变合金的晶体结构,仍为La Ni5相;SEM-EDS和红外吸收光谱测试表明,经过表面处理之后合金表面附着了聚吡咯（PPy）导电高分子层。电化学测试表明,在不同处理温度下,当放电电流密度为323.53 m A/g时,合金电极的HRD从79.56%（T=293 K）增加到91.3%（T=323 K）。不同处理时间下,当放电电流密度为485.29 m A/g时,合金电极的HRD从70.4%（未处理）增加到80.3%（t=5 min）再增加到87.2%（t=8 min）。合金电极电化学动力学性能的显著改善是由于合金电极所镀覆的聚吡咯具有良好的导电性以及镀层抑制了合金电极在碱液中的腐蚀的原因。In order to improve the electrochemical properties of AB5-type La Ni3. 81 Mn0. 30 Co0. 79 Al0. 10 hydrogen storage alloy electrodes,this alloy was modified via the method of a simple chemical oxidative polymerization of pyrrole（ Py） directly occurring on the surface of alloy particles. The surface morphology and the electrochemical properties of the alloy in different modified temperature（ T = 293 K,323 K,343 K） and different modified time（ t = 5 min,8 min,10 min） were tested. XRD showed that the surface modification did not change the crystal structure of the AB5-type alloy,SEM-EDS and the infrared absorption spectra tested found that after chemical modified,the alloy surface was covered with the PPy layer. Electrochemical measurements showed that at different modified temperatures,the HRD of the alloy electrodes decreased from 84. 4%（ blank）to 79. 56%（ T = 293 K） and then increased to 91. 3%（ T = 323 K） when the discharge current density was 323. 53 m A/g. At different modified time,the HRD of the alloy electrodes increased from 70. 4%（ blank） to 80. 3%（ t = 5 min） and then increased to 87. 2%（ t = 8 min） when the discharge current density was 485. 29 m A/g. The electrochemical kinetic properties of alloy electrodes were improved markedly owing to the electro-conductibility and corrosion resistance in alkaline solution of this layer.

关 键 词：聚吡咯 储氢合金 表面处理 电化学性能 

分 类 号：TM912.2[电气工程—电力电子与电力传动]