导电聚苯胺对La0.8Mg0.2Ni3.4Al0.1储氢合金电化学性能的影响  

Effects of Conducitve Polyanilineon on Electrochemical Properties of La0.8Mg0.2Ni3.4Al0.1 Hydrogen Storage Alloy

作　　者：王北平[1] 马金福[1] 邹忠利[1] 薛同[1] WANG Bei-ping;MA Jin-fu;ZOU Zhong-li;XUE Tong(School of Materials and Science Engineering,North Minzu University,Yinchuan 750021,China)

机构地区：[1]北方民族大学材料科学与工程学院

出　　处：《稀土》2018年第4期43-49,共7页Chinese Rare Earths

基　　金：宁夏高等学校科学技术研究项目(NGY201648);宁夏粉体材料和特种材料重点实验室项目(1603);中科院“西部之光”人才培养计划一般项目

摘　　要：研究了超声辅助下在La（0.8）Mg（0.2）Ni（3.4）Al（0.1）合金颗粒表面沉积导电聚苯胺（PANI）对合金形貌和电化学性能的影响。XRD分析表明,该合金为多相结构,合金主相为Gd2Co7型相。SEM照片表明,超声辅助下在合金颗粒局部表面沉积了聚苯胺层。电化学性能研究表明,随着聚苯胺溶液浓度的增加,合金/PANI复合物电极放电容量逐渐下降,循环性能先提高后下降。当聚苯胺溶液浓度为4%时,样品在300次电化学循环后容量保持率达到71.2%。Tafel曲线测试表明,合金表面聚苯胺层的存在降低了电极腐蚀电流密度,从而提高了合金/PANI复合物循环性能。The effects of conductive PANI coated by the help of ultrasonication on the electrochemical properties of La0. 8 Mg0. 2 Ni3. 4 Al0. 1 hydrogen storage alloys were studied. The XRD analysis indicated that La0. 8 Mg0. 2 Ni3. 4 Al0. 1 alloy is composed of muliphases,and the Gd2 Co7-type phase accounted for main content. The SEM images indicated that PANI coatings were formed on the surface of the alloy particles by ultrasonic treatment. The electrochemical tests indicated that the discharge capacity decreased with the increaing contents of PANI solution,and the cycle life first increased and then decreased. The capactiy retention over 300 cylces remained 71. 2% when the PANI solution concentration equalled to 4%. Tafel tests indicated that the PANI coatings decreased the corrosion current of the electrode,then the cycle life of the alloy/PANI composite was enhanced.

关 键 词：储氢合金 导电聚苯胺 电化学 抗腐蚀性 

分 类 号：TG139.7[一般工业技术—材料科学与工程]