A new approach of structural and chemical modification on graphene electrodes for high-performance supercapacitors
A new approach of structural and chemical modification on graphene electrodes for high-performance supercapacitors
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DOI：
10.1016/j.carbon.2015.12.079
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发表时间：
2016-04-01
期刊：
影响因子：
10.9
通讯作者：
Lee, Kwanghee
中科院分区：
文献类型：
--
作者：
Hwang, Yun-Hwa;Lee, Sun Min;Lee, Kwanghee
石墨烯基超级电容器的低能量密度一直是其商业化的关键瓶颈。特别地，由于还原氧化石墨烯（RGO）电极中缺乏电多孔通道和法拉第反应不足而导致的差的电容已经成为其成功应用的主要限制因素。在本文中，我们展示了一种创新的工艺，用于通过在室温下通过碱处理辅助的ZnO模板实现的具有良好互连的多孔通道和氧官能团（表示为PRGO-O电极）的电极性质的改性。PRGO-O电极主要由位于隔离的大孔RGO夹层之间的分级介孔结构控制，并通过锚定在互连多孔结构表面上的氧官能团顺序排列。这些相互连接的多孔结构和氧功能化的协同效应导致在双电极超级电容器电池中具有38.8 Wh kg（-1）的高能量密度和322.1 F g（-1）的比电容。这一结果为设计高性能储能装置的高电容和高倍率电极提供了一种有前途的解决方案。(C)2015爱思唯尔有限公司版权所有。
The low energy density of graphene-based supercapacitors has been a critical bottleneck for their commercialization. In particular, the poor capacitance due to the lack of electrically porous channels and insufficient Faradaic reactions in reduced graphene oxide (RGO) electrodes has been a major limiting factor for their successful application. Herein, we demonstrate an innovative process for modifying the electrode properties with well-interconnected porous channels and oxygen-functional groups (denoted as the PRGO-O electrode) achieved via a ZnO-template assisted by alkaline treatment at room temperature. The PRGO-O electrodes are dominated by hierarchical mesoporous structures located between the isolated macroporous RGO interlayers and arranged sequentially by oxygen-functional groups anchored on the surface of interconnected porous structures. Those synergetic effects of interconnected porous structures and oxygen-functionalization resulted in a specific capacitance of 322.1 F g(-1) with a high energy density of 38.8 Wh kg(-1) in two-electrode supercapacitor cells. This result provides a promising solution for designing high-capacitive and high-rate electrodes for high-performance energy storage devices. (C) 2015 Elsevier Ltd. All rights reserved.