Influence of the Electrolyte Film Thickness on Charge Dynamics of Ionic Liquids in Ionic Electroactive Devices.
Influence of the Electrolyte Film Thickness on Charge Dynamics of Ionic Liquids in Ionic Electroactive Devices.
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DOI：
10.1021/ma202165n
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发表时间：
2012-02-10
期刊：
影响因子：
5.5
通讯作者：
Zhang QM
中科院分区：
文献类型：
--
作者：
Lin J;Liu Y;Zhang QM
开发先进的离子电活性设备，如离子致动器和超级电容器，需要了解离子扩散和漂移过程，这取决于离子在这些系统中行进的距离。在宽的膜厚度（d）范围内研究了[C4 mim][PF 6]离子液体膜和具有40wt%[C2mim][TfO]的Aquivion膜的电荷动力学。发现双电层充电时间τDL很好地遵循经典模型τDL = λDd/（2D），其中D为扩散系数，λD为德拜长度。在扩散占主导地位的较长时间区域（t τDL）中，电荷动力学变得依赖于电压。对于低施加电压，后期充电过程似乎遵循d2依赖性。然而，在高电压（> 0.5V）下，其中发生显著的器件响应，充电过程不显示d2依赖性，使得没有观察到τdiff = d2/（4D），对应于从体区域的离子扩散。
Developing advanced ionic electroactive devices such as ionic actuators and supercapacitors requires the understanding of ionic diffusion and drifting processes, which depend on the distances over which the ions travel, in these systems. The charge dynamics of [C4mim][PF6] ionic liquid films and Aquivion membranes with 40 wt% [C2mim][TfO] were investigated over a broad film thickness (d) range. It was found that the double layer charging time τDL follows the classic model τDL = λDd/(2D) very well, where D is the diffusion coefficient and λD the Debye length. In the longer time regimes (t ≫ τDL) where diffusion dominates, the charge dynamics become voltage dependent. For low applied voltage, the later stage charge process seems to follow the d2 dependence. However, at high voltages (> 0.5 V) in which significant device responses occur, the charging process does not show d2 dependence so that τdiff = d2/(4D), corresponding to the ion diffusion from the bulk region, was not observed.
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影响因子：
--
作者：
MACDONALD, JR
通讯作者：
MACDONALD, JR
影响因子：
4.6
作者：
Lin, Junhong;Liu, Yang;Zhang, Q. M.
通讯作者：
Zhang, Q. M.
影响因子：
5.5
作者：
Chen, Liang;Hallinan, Daniel T., Jr.;Hillmyer, Marc A.
通讯作者：
Hillmyer, Marc A.
影响因子：
9.2
作者：
Kreuer, K. D.;Schuster, M.;Maier, J.
通讯作者：
Maier, J.
影响因子：
3.3
作者：
Hou, Jianbo;Zhang, Zhiyang;Madsen, Louis A.
通讯作者：
Madsen, Louis A.