柔性氢氧化镍/石墨烯膜的制备及超电容性能研究  

Preparation of Flexible Nickel Hydroxide-Graphene Film and Its Supercapacitor Performances

作　　者：许娟[1] 薛宇飞[1] 王国鑫[1] 魏曦晨 曹剑瑜[1,2] 陈智栋[1,2] 

机构地区：[1]常州大学石油化工学院,江苏常州213164 [2]江苏省太阳能电池与储能技术重点实验室,江苏常州213164

出　　处：《常州大学学报（自然科学版）》2015年第3期7-12,共6页Journal of Changzhou University：Natural Science Edition

基　　金：江苏省科技支撑计划基金(BE201113);江苏省自然科学基金(BK2012591;12KJA150003)

摘　　要：采用恒电流法在高导电性石墨烯膜的表面均匀沉积氢氧化镍,制得电化学性能优异的柔性氢氧化镍/石墨烯膜。运用场发射扫描电镜(FESEM)和X射线衍射(XRD)对实验制备的氢氧化镍/石墨烯膜进行了形貌和结构分析,通过循环伏安法(CV)和恒电流充放电测试在6mol·L-1的KOH溶液中研究了氢氧化镍/石墨烯膜电极的电化学性能。研究结果显示,花状α型氢氧化镍能够均匀分散在柔性石墨烯膜表面。沉积50s时制备的氢氧化镍/石墨烯膜的电化学性能最佳,在电流密度1、2、3A·g-1下的比电容依次为1 897、1 736、1 699F·g-1。更为重要的是,组装的非对称电化学电容器氢氧化镍/石墨烯膜—石墨烯膜在电流密度1A·g-1条件下循环1 000圈之后的电化学比容量还能保留原来的97.8%。氢氧化镍/石墨烯膜电极具有电化学容量高、循环寿命长和制备过程简单等优点,是一种很有前景的超级电容器电极材料。Flexible nickel hydroxide/graphene film was synthesized by evenly electrodepositing nickel hy- droxide on highly conductive graphene film using constant current method. The synthesized nickel hydrox- ide/graphene film was characterized by field emission scanning electron microscopy （FESEM） and X-ray diffraction （XRD） analysis. The electrochemical capacitance behavior of the nickel hydroxide/graphene film electrode was investigated by cyclic voltammetry（CV） and galvanostatic charge-discharge studies in 6mol· L-1 KOH solution. The experimental results showed that flower-like α-Ni（OH）2 could be uni- formly dispersed on foldable graphene film and the sample that was electrochemically deposited for 50 s ex- hibited optimum electrochemical performances. The specific capacitance can reach 1 897,1 736 and 1 699F · g-1 at 1,2A · g-1 and 3A · g-1, respectively. More importantly, the specific capacitance retention ratio of the assembled Ni （OH）2/graphene film-graphene film asymmetric supercapacitor still can maintain 97.8% after 1 000 galvanostatic charge-discharge cycles at 1A · g-1. The synthesized nickel hydroxide/ graphene film showed high specific capacitance, long cycle life and simple synthesis process and was con- sidered as one promising electrode material.

关 键 词：柔性氢氧化镍/石墨烯 电化学电容器 电沉积 电化学性能 

分 类 号：O646[理学—物理化学]