【摘要】 采用手工铸膜的方式把PMMA/MWCNTs复合膜包覆在Mg₃MnNi₂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Mg₃MnNi₂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。更多还原

【Abstract】 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 20 μm 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（S 10） 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.更多还原