摘要
利用液相共沉淀法制备纳米氧化锰。用XRD和SEM进行了材料表征。以泡沫镍作集流体,以KCl、Na2SO4和K2SO4为电解液,通过循环伏安法,研究了不同的电位窗口、扫描速度和浓度对氧化锰电极电容特性的影响。结果表明,样品为无定形的α-MnO2·nH2O,粒径为40～50nm。氧化锰电极在Na2SO4和K2SO4电解液中具有良好的稳定性,在0.5mol/LK2SO4溶液中,–0.2～0.8V(vsSCE)的电位窗口内,具有良好的电容行为,比容量高达143.7F/g。
Amorphous hydrous nano-MnO2 was synthesized by chemical coprecipitation method. Physical properties of MnO2 were characterized by XRD and SEM. Under the conditions of different potential windows, different sweep rates and different concentrations aqueous electrolytes, the effects on MnO2 electrode pressed on foam nickel current collector were studied by cyclic voltammogram (CV) in KCl, Na2SO4 and K2SO4 electrolytes. Amorphous hydrous nano-MnO2 in Na2SO4 and K2SO4 electrolytes proves to be excellent electrode material for supercapacitor. Amorphous hydrous nano-MnO2 within a potential window range of –0.2 to +0.8 V (vs SCE) can provide a specific capacitance of 143.7 F/g in 0.5 mol/L K2SO4 aqueous electrolytes at sweep rate 4 mV/s.
出处
《电子元件与材料》
CAS
CSCD
北大核心
2005年第6期33-36,共4页
Electronic Components And Materials
关键词
电子技术
超电容器
氧化锰
电解液
循环伏安
electronic technology
supercapacitor
MnO2
electrolyte
cyclic voltammogram (CV)
