α-MnO_2纳米线的微波法制备及其电化学性能研究  

Microwave Assisted Synthesis ofα-MnO_2 Nanowires and Their Electrochemical Properties

作　　者：王译莹[1] 李庆[1,2] 张连营[1] 黎雪莲[1] 曾志军[1] 张进[2] 钟小玲[1] 

机构地区：[1]西南大学材料科学与工程学院,重庆400715 [2]重庆文理学院重庆市高校微纳米材料工程与技术重点实验室,重庆402168

出　　处：《材料导报（纳米与新材料专辑）》2011年第1期100-103,106,共5页

基　　金：国家教育部科学技术重点项目(105144);国家人事部留学人员科技活动择优资助项目(2008-17);重庆市高校新材料开发及应用研究创新团队建设(201042)

摘　　要：以KMnO_4为锰源,在离子液体1-丁基-3甲基咪唑六氟磷酸盐[BMIM][PF_6]水溶液中通过微波加热法制备了α-MnO_2纳米线,并采用XRD和FESEM对产物的结构和形貌进行了表征。发现反应时间和离子液体对产物的形貌和尺寸起着关键作用,提出了反应机理。用循环伏安曲线、线性扫描曲线以及塔弗尔曲线在1mol/L的NaOH碱性溶液中研究了α-MnO_2的电化学性能。结果表明,90℃微波辐照1h所得到的纳米线形貌最均一,平均直径为15nm、平均长度为2μm,且具有良好的电化学性能,有望作为催化剂应用在燃料电池上。A microwave-assisted heating process has been developed to synthesize α-MnO2 nanowires based on the decomposed reaction of KMnO4 in ionic liquid （[BMIM][PF6） aqueous solution. The product was characterized by X-ray diffraetion（XRD） and field emission scanning electron mieroscopy（FESEM）. It is found that the reaction temperature and ionic liquid are the key factors to determine the morphology and size. A plausible mechanism was pro posed to explain the formation of α-MnO2 nanowires. The electrochemical properties of the as-prepared samples were utilized by cyclic voltammetry curves, linear potential sweep curves, Tafel plots in lmol/L NaOH solution. The results show that α-MnO2 nanowires have the best morphology with a mean diameter of 15nm and a length of 2μm at 90℃ heating for 1h and the α-MnO2 exhibited excellent electrochemical characteristics. It＇s possible that the α-MnO2 can be used as a catalyst in fuel cells.

关 键 词：二氧化锰 纳米线 微波法 电化学性能 

分 类 号：TB34[一般工业技术—材料科学与工程]