Sieving Effects in Electrical Double‐Layer Capacitors Based on Neat [Al(hfip)4]− and [NTf2]− Ionic Liquids

Sieving Effects in Electrical Double‐Layer Capacitors Based on Neat [Al(hfip)4]− and [NTf2]− Ionic Liquids
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基于纯 [Al(hfip)4]â 和 [NTf2]â 离子液体的双层电容器的筛分效应

DOI:
10.1002/celc.201500024
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Ingo Krossing
Ingo Krossing
中科院分区:
--
文献类型:
--
作者:
Nataliya Roznyatovskaya;Alexander B. A. Rupp;Jens Tübke;Ingo Krossing

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本文介绍了以[Al(hfip)4]−和[NTf2]−阴离子作为超级电容器电解质的离子液体(ILs)的电化学研究。改进了[Al(hfip)4] - il的合成,使电化学测量所需的水含量最小化。制备了从微孔到大孔不同孔径的电极。用电极对8种离子交换膜进行了阻抗和循环伏安研究,结果表明,尽管它们的输运特性接近理想,但在微孔情况下,[Al(hfip)4]−离子交换膜受到筛分效应的影响,导致电容与[NTf2]−离子交换膜相比急剧下降。当在中孔或大孔电极上消除尺寸的影响时,铝酸盐在电容方面具有竞争力,并且表明,在没有筛分效应的情况下,它们的基本性质原则上也使它们成为合适的电解质。
We present an electrochemical investigation into ionic liquids (ILs) based on [Al(hfip)4]−and [NTf2]−anions as electrolytes in supercapacitors. The synthesis of [Al(hfip)4]−ILs was improved to minimize the water content for electrochemical measurements. Several electrodes with different pore sizes from micropores to macropores were prepared. Impedance and cyclic voltammetry studies of eight ILs were conducted with the electrodes and revealed that, despite their close‐to‐ideal transport properties, [Al(hfip)4]−ILs suffer from a sieving effect in the case of micropores, which leads to a sharp drop in capacitance compared with [NTf2]−ILs. When the influence of the size is abrogated at meso‐ or macroporous electrodes, the aluminate salts become competitive in terms of capacitance and show that, without a sieving effect, their basic properties in principal make them suitable electrolytes as well.
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