Self-Assembled, Redox-Active Graphene Electrodes for High-Performance Energy Storage Devices

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• 作者：Tianyuan Liu ; Reza Kavian ; Inkyu Kim ; Seung Woo Lee
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2014
• 出版时间：December 18, 2014
• 年：2014
• 卷：5
• 期：24
• 页码：4324-4330
• 全文大小：413K
• ISSN：1948-7185

文摘

Graphene-based materials have been utilized as a promising approach in designing high-performance electrodes for energy storage devices. In line with this approach, functionalized graphene electrodes have been self-assembled from the dispersion of graphene oxide (GO) in water at a low temperature of 80 掳C using tetrahydroxyl-1,4-benzoquinone (THQ) as both the reducing and redox-active functionalization agent. We correlated the electrochemical performance of the electrode with surface oxygen chemistry, confirming the role of THQ for the reduction and redox-active functionalization process. The assembled graphene electrodes have a 3D hierarchical porous structure, which can facilitate electronic and ionic transport to support fast charge storage reactions. Utilizing the surface redox reactions introduced by THQ, the functionalized graphene electrodes exhibit high gravimetric capacities of 鈭?65 mA h/g in Li cells and 鈭?20 mA h/g in Na cells with high redox potentials over 鈭? V versus Li or Na, proposing promising positive electrodes for both Li and Na ion batteries.

Keywords:

self-assembly; graphene; 3D electrode; surface-redox reaction; rechargeable batteries