离子液体
超级电容器
石英晶体微天平
电化学
电解质
离子
电容
材料科学
纳米颗粒
离子键合
纳米技术
化学工程
电极
无机化学
化学
催化作用
有机化学
吸附
物理化学
工程类
作者
Qingyun Dou,Lingyang Liu,Bingjun Yang,Junwei Lang,Xingbin Yan
标识
DOI:10.1038/s41467-017-02152-5
摘要
Abstract Supercapacitors based on activated carbon electrodes and ionic liquids as electrolytes are capable of storing charge through the electrosorption of ions on porous carbons and represent important energy storage devices with high power delivery/uptake. Various computational and instrumental methods have been developed to understand the ion storage behavior, however, techniques that can probe various cations and anions of ionic liquids separately remain lacking. Here, we report an approach to monitoring cations and anions independently by using silica nanoparticle-grafted ionic liquids, in which ions attaching to silica nanoparticle cannot access activated carbon pores upon charging, whereas free counter-ions can. Aided by this strategy, conventional electrochemical characterizations allow the direct measurement of the respective capacitance contributions and acting potential windows of different ions. Moreover, coupled with electrochemical quartz crystal microbalance, this method can provide unprecedented insight into the underlying electrochemistry.
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