Synergistic Effects from Graphene and Carbon Nanotubes Enable Flexible and Robust Electrodes for High-Performance Supercapacitors
Synergistic Effects from Graphene and Carbon Nanotubes Enable Flexible and Robust Electrodes for High-Performance Supercapacitors
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DOI：
10.1021/nl301804c
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发表时间：
2012-08-01
期刊：
影响因子：
10.8
通讯作者：
Liu, Jie
中科院分区：
文献类型：
--
作者：
Cheng, Yingwen;Lu, Songtao;Liu, Jie
灵活且轻便的储能系统由于其在可穿戴电子产品、卷绕显示器和其他设备中的潜在应用，最近引起了极大的兴趣。为了制造此类系统，具有所需机械和电化学性能的柔性电极至关重要。在此，我们提出了一种基于石墨烯/MnO2/CNT纳米复合材料制造导电、高度柔性且坚固的薄膜超级电容器电极的新方法。石墨烯、碳纳米管和二氧化锰的协同效应可提供出色的机械性能（拉伸强度为 48 MPa）和卓越的电化学活性，这是任何这些成分单独无法实现的。这些柔性电极可实现高活性材料负载 (71 wt% MnO2)、面密度 (8.80 mg/cm(2)) 和高比电容 (372 F/g)，并且超级电容器具有出色的倍率性能，无需集流体和粘合剂。该薄膜还可以缠绕在直径0.5毫米的棒上，用于制造高性能的全电池，在柔性储能设备中显示出巨大的潜力。
Flexible and lightweight energy storage systems have received tremendous interest recently due to their potential applications in wearable electronics, roll-up displays, and other devices. To manufacture such systems, flexible electrodes with desired mechanical and electrochemical properties are critical. Herein we present a novel method to fabricate conductive, highly flexible, and robust film supercapacitor electrodes based on graphene/MnO2/CNTs nanocomposites. The synergistic effects from graphene, CNTs, and MnO2 deliver outstanding mechanical properties (tensile strength of 48 MPa) and superior electrochemical activity that were not achieved by any of these components alone. These flexible electrodes allow highly active material loading (71 wt % MnO2), areal density (8.80 mg/cm(2)), and high specific capacitance (372 F/g) with excellent rate capability for supercapacitors without the need of current collectors and binders. The film can also be wound around 0.5 mm diameter rods for fabricating full cells with high performance, showing significant potential in flexible energy storage devices.