PMMA/MWCNTs复合膜包覆Mg_3MnNi_2合金电极的电化学性能研究  

Electrochemical hydrogen storage properties of Mg_3MnNi_2 electrode coated by PMMA/MWCNTs composite film

作　　者：汪太淼 朱云峰[1,2] 刘雅娜 林怀俊[1,2] 李李泉 WANG Tai-miao;ZHU Yun-feng;LIU Ya-na;LIN Huai-jun;LI Li-quan(College of Materials Science and Engineering,Nanjing Tech University,Nanjing Jiangsu 210009,China;Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing Tech University,Nanjing Jiangsu 210009,China)

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009 [2]江苏省先进无机复合材料协同创新中心,江苏南京210009

出　　处：《电源技术》2018年第10期1500-1503,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51471087;51571112);江苏高校优势学科建设工程资助

摘　　要：采用手工铸膜的方式把PMMA/MWCNTs复合膜包覆在Mg_3MnNi_2电极片表面。利用扫描电子显微镜(SEM)观察分析聚合物包覆后电极片表面形貌以及电极片的截断面,结果表明厚度为20 mm的PMMA/MWCNTs复合膜均匀包覆在Mg_3MnNi_2电极片的表面。恒电流充放电结果表明,经过PMMA/MWCNTs复合膜包覆后,电极片在电解液中的循环稳定性得到较大改善,10个循环的容量保持率从45.0%提高到72.7%。Tafel极化测试结果表明,PMMA/MWCNTs复合膜能够有效提高电极片的抗腐蚀性能。电极动力学测试结果表明PMMA/MWCNTs复合膜包覆降低了电极表面的电荷转移速率,但不影响合金中氢的扩散能力。Mg3MnNi2 electrode was coated by PMMA/MWCNTs through manual casting films.Scanning electron microscopy(SEM)was used to observe the surface morphology of the prepared electrodes and the fractured surface of the coated electrode.The results show that PMMA/MWCNTs composite film of about 20μm of the thickness is successfully coated on the surface of Mg3MnNi2 electrode.The galvanostatic charge-discharge test show that the discharge capacity retention rate at the tenth cycle(S10)increases from 45.0%to 72.7%,indicating that the PMMA/MWCNTs composite film can significantly improve the cycling stability.The results of Tafel polarization test indicate that the PMMA/MWCNTs composite film can enhance the anti-corrosion ability.Potentiostatic discharge,linear polarization and EIS were tested to investigate the kinetic properties of the prepared electrodes and the results show that the PMMA/MWCNTs composite film has no effect on the diffusion of hydrogen,and the hydrogen diffusion ability in the alloy is not affected.

关 键 词：氢镍蓄电池 储氢 Mg3MnNi2 PMMA 包覆 

分 类 号：TM911[电气工程—电力电子与电力传动]