Creation of nanopores on graphene planes with MgO template for preparing high-performance supercapacitor electrodes
Creation of nanopores on graphene planes with MgO template for preparing high-performance supercapacitor electrodes
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用MgO模板在石墨烯平面上创建纳米孔以制备高性能超级电容器电极
DOI：
10.1039/c4nr00538d
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发表时间：
2014
期刊：
影响因子：
6.7
通讯作者：
Lei Zhibin
中科院分区：
文献类型：
--
作者：
Wang Huanjing;Sun Xiuxia;Liu Zonghuai;Lei Zhibin
在石墨烯平面上创建纳米孔对于促进电解质的动力学扩散和提高石墨烯平面的利用效率具有重要意义。在此，我们开发了一种简便的化学气相沉积策略，以片状 MgO 为模板，二茂铁为碳前驱体制备高度多孔的石墨烯。石墨烯层显示出高度多孔的结构，具有 4-8 nm 的小介孔、10-20 nm 的大介孔和 100-200 nm 的附加大孔。石墨烯片上的这些纳米孔为垂直于二维基面的快速离子传输提供了众多通道，而良好的粉末导电性确保了电子在二维石墨烯平面内的有效传播。结果，与无孔和堆叠石墨烯电极相比，实现了 303 F g−1 的比电容、高达 17.3 μF cm−2 的面积电容和近十倍的时间常数。本文演示的方法将为制备多孔石墨烯提供机会，以广泛应用于能源存储、生物传感器、纳米电子学和催化领域。
Creation of nanopores on graphene planar sheets is of great significance in promoting the kinetic diffusion of electrolyte and enhancing the utilization efficiency of graphene planar sheets. Herein, we developed a facile chemical vapor deposition strategy to prepare highly porous graphene with flake-like MgO as template and ferrocene as the carbon precursor. The graphene layers show a highly porous structure with small mesopores of 4–8 nm, large mesopores of 10–20 nm and additional macropores of 100–200 nm. These nanopores on graphene sheets provide numerous channels for fast ion transport perpendicular to the 2D basal plane, while the good powder conductivity ensures an effective electron propagation within the 2D graphene plane. As a result, a specific capacitance of 303 F g−1, an areal capacitance up to 17.3 μF cm−2 and a nearly tenfold shorter time constant were achieved when compared with those of nonporous and stacked graphene electrodes. The method demonstrated herein would open up an opportunity to prepare porous graphene for a wide applications in energy storage, biosensors, nanoelectronics and catalysis.