Charge Storage Mechanisms of Single-Layer Graphene in Ionic Liquid
Charge Storage Mechanisms of Single-Layer Graphene in Ionic Liquid
复制标题
单层石墨烯在离子液体中的电荷存储机制
DOI：
10.1021/jacs.9b07134
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发表时间：
2019
影响因子：
15
通讯作者：
Simon Patrice
中科院分区：
文献类型：
--
作者：
Ye Jianglin;Wu Yih Chyng;Xu Kui;Ni Kun;Shu Na;Taberna Pierre Louis;Zhu Yanwu;Simon Patrice
基于石墨烯的碳材料是一种很有前途的双电层电容器候选材料，人们对石墨烯/电解液界面的结构和性质有很大的兴趣。采用电化学阻抗谱(EIS)和电化学石英晶体微天平(EQCM)研究了整齐离子液体(EMI-TFSI)电解液中单层石墨烯的离子通量和吸附行为。结果表明，在正极化和负极化过程中，正离子物种脱附和离子重组分别主导着双电层充电，导致EDL电容随外加电势的增加而增大。
Graphene-based carbon materials are promising candidates for electrical double-layer (EDL) capacitors, and there is considerable interest in understanding the structure and properties of the graphene/electrolyte interface. Here, electrochemical impedance spectroscopy (EIS) and electrochemical quartz crystal microbalance (EQCM) are used to characterize the ion fluxes and adsorption on single-layer graphene in neat ionic liquid (EMI-TFSI) electrolyte. It is found that a positively charged ion-species desorption and ion reorganization dominate the double-layer charging during positive and negative polarizations, respectively, leading to the increase in EDL capacitance with applied potential.