State Key Lab for Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Nanoscale. 2017 Aug 31;9(34):12601-12608. doi: 10.1039/c7nr03058d.
Three-dimensional functionalized graphene monoliths (3DFGMs) have attracted intensive attention as energy storage materials due to their unique interconnected porous structure, good electrical conductivity, excellent mechanical strength, and pseudocapacitive characteristic. Herein, we report a facile, green and low-cost strategy through a simple, one-step electrochemical process in a phytic acid solution to fabricate a 3DFGM. The 3D porous structure and functionalization of graphene can be obtained simultaneously. The as-obtained 3DFGM that consists of 3D porous O, P-functionalized few-layer graphene shows high specific surface area and good electrical conductivity. The 3DFGM with these characteristics exhibits excellent electrochemical performance, including an ultrahigh specific areal capacitance of 485 mF cm, superior rate performance, and outstanding cycling stability. Most importantly, the assembled 3DFGM//3DFGM symmetric supercapacitor exhibits a high specific areal capacitance of 225 mF cm and delivers a maximum energy density of 1.2 W h L and a power density of 560 W L in aqueous electrolyte. Therefore, this work provides a promising method for the future design and fabrication of high performance 3D functionalized graphene-based electrodes for energy storage devices.
三维功能化石墨烯整体材料（3DFGMs）因其独特的互联多孔结构、良好的导电性、优异的机械强度和赝电容特性，作为储能材料引起了人们的广泛关注。在此，我们报道了一种简便、绿色、低成本的策略，即在植酸溶液中通过简单的一步电化学过程来制备 3DFGM。可以同时获得 3D 多孔石墨烯的功能化。所获得的由 3D 多孔 O、P 功能化少层石墨烯组成的 3DFGM 具有高比表面积和良好的导电性。具有这些特性的 3DFGM 表现出优异的电化学性能，包括超高的比面积电容为 485 mF cm，优异的倍率性能和出色的循环稳定性。最重要的是，组装的 3DFGM//3DFGM 对称超级电容器在水性电解质中表现出 225 mF cm 的高比面积电容，最大能量密度为 1.2 W h L，功率密度为 560 W L。因此，这项工作为未来设计和制造高性能 3D 功能化基于石墨烯的储能器件电极提供了一种有前景的方法。
