化学
离子液体
电容
电化学
电容器
电场
电解质
单体
离子键合
电极
晶体管
光电子学
超级电容器
电化学窗口
离子
分析化学(期刊)
电压
电气工程
材料科学
离子电导率
色谱法
物理化学
有机化学
聚合物
催化作用
工程类
物理
量子力学
作者
Michio Matsumoto,Sunao Shimizu,Rina Sotoike,Masayoshi Watanabe,Yoshihiro Iwasa,Yoshimitsu Itoh,Takuzo Aida
摘要
Electric double layer (EDL) capacitors are promising as next-generation energy accumulators if their capacitances and operation voltages are both high. However, only few electrolytes can simultaneously fulfill these two requisites. Here we report that an oligomeric ionic liquid such as IL4TFSI with four imidazolium ion units in its structure provides a wide electrochemical window of ∼5.0 V, similar to monomeric ionic liquids. Furthermore, electrochemical impedance measurements using Au working electrodes demonstrated that IL4TFSI exhibits an exceptionally high EDL capacitance of ∼66 μF/cm2, which is ∼6 times as high as those of monomeric ionic liquids so far reported. We also found that an EDL-based field effect transistor (FET) using IL4TFSI as a gate dielectric material and SrTiO3 as a channel material displays a very sharp transfer curve with an enhanced carrier accumulation capability of ∼64 μF/cm2, as determined by Hall-effect measurements.
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