Flexible Solid-State Supercapacitors Based on Three-Dimensional Graphene Hydrogel Films
Flexible Solid-State Supercapacitors Based on Three-Dimensional Graphene Hydrogel Films
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DOI：
10.1021/nn4000836
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发表时间：
2013-05-01
期刊：
影响因子：
17.1
通讯作者：
Duan, Xiangfeng
中科院分区：
文献类型：
--
作者：
Xu, Yuxi;Lin, Zhaoyang;Duan, Xiangfeng
柔性固态超级电容器作为未来柔性电子的移动的电源具有相当大的兴趣。基于石墨烯或碳纳米管的薄膜已用于制造柔性固态超级电容器，其具有高重量比电容（80-200 F/g），但通常具有相当低的总体或面积比电容（3-50 mF/cm（2）），这是由于超小的电极厚度（通常为几微米）和超低的质量负载，这对于实际应用是不期望的。在这里，我们报告了三维（3D）石墨烯水凝胶的探索，用于制造高性能的固态柔性超级电容器。石墨烯水凝胶具有高度互连的3D网络结构，具有出色的导电性和机械鲁棒性，使其成为柔性储能设备的优良材料。我们的研究表明，具有120 μ m厚的石墨烯水凝胶薄膜的柔性超级电容器可以表现出优异的电容特性，包括186 F/g的高重量比电容（对于42 μ m厚的电极，高达196 F/g），前所未有的372 mF/cm 2的面积比电容（对于185 μ m厚的电极，高达402 mF/cm 2）、低漏电流（10.6 μ A）、优异的循环稳定性和非凡的机械柔性。这项研究证明了3D石墨烯宏观结构用于高性能柔性储能设备的令人兴奋的潜力。
Flexible solid-state supercapacitors are of considerable interest as mobile power supply for future flexible electronics. Graphene or carbon nanotubes based thin films have been used to fabricate flexible solid-state supercapacitors with high gravimetric specific capacitances (80-200 F/g), but usually with a rather low overall or areal specific capacitance (3-50 mF/cm(2)) due to the ultrasmall electrode thickness (typically a few micrometers) and ultralow mass loading, which is not desirable for practical applications. Here we report the exploration of a three-dimensional (3D) graphene hydrogel for the fabrication of high-performance solid-state flexible supercapacitors. With a highly interconnected 3D network structure, graphene hydrogel exhibits exceptional electrical conductivity and mechanical robustness to make it an excellent material for flexible energy storage devices. Our studies demonstrate that flexible supercapacitors with a 120 pm thick graphene hydrogel thin film can exhibit excellent capacitive characteristics, including a high gravimetric specific capacitance of 186 F/g (up to 196 F/g for a 42 pm thick electrode), an unprecedented areal specific capacitance of 372 mF/cm2 (up to 402 mF/cm2 for a 185 pm thick electrode), low leakage current (10.6 mu A), excellent cycling stability, and extraordinary mechanical flexibility. This study demonstrates the exciting potential of 3D graphene macrostructures for high-performance flexible energy storage devices.