Functionalization of widely used graphene oxide (GO) can be beneficial not only in tuning its characteristics along with preventing the restacking of its layers and improving wettability but also in providing pseudocapacitance as a supercapacitor electrode. In this research, for the first time, the electrochemical performance of guanidine-functionalized graphene oxide (G-GO) examined by means of both computational and experimental methods. As a high-performance supercapacitor electrode, G-GO illustrates a high specific capacitance of 612F/g at the current density of 1.5 A/g together with extraordinary cyclic stability for 12,000 cycles at high current density of 10 A/g. Moreover, quantum capacitance together with the layer distance change during functionalization reaction, calculated via density functional theory (DFT), also exhibit the superior performance of G-GO.

中文翻译：

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基于胍功能化氧化石墨烯的高性能超级电容器的实验和理论研究

广泛使用的氧化石墨烯（GO）的功能化不仅有利于调整其特性、防止其层重新堆叠和改善润湿性，而且有利于提供作为超级电容器电极的赝电容。在这项研究中，首次通过计算和实验方法检查了胍功能化氧化石墨烯（G-GO）的电化学性能。作为一种高性能超级电容器电极，G-GO 在 1.5 A/g 的电流密度下具有 612F/g 的高比电容，以及在 10 A/g 高电流密度下 12,000 次循环的非凡循环稳定性。此外，通过密度泛函理论（DFT）计算的量子电容以及功能化反应过程中层距的变化也表现出了G-GO的优越性能。