Graphene has been extensively investigated as an electrode material for high-performance supercapacitors due to its high electrical conductivity and large surface area. Because conventional graphene-based supercapacitors use reduced graphene oxide (rGO) in a powder form, the particle size can be one of the important factors affecting the supercapacitor performance. In this study, the effect of the particle size of graphene oxide (GO) powders was studied for the electrochemical performance of graphene-based supercapacitors. The GO powders with three different particle size distributions were used for the electrochemical tests after reducing the GO powders using simple microwave irradiation. The chemical characteristics and specific surface areas of the rGO powders synthesized by microwave irradiation (MWrGO) were nearly the same for all cases. However, the supercapacitor using the MWrGO powders with a medium size showed a higher specific capacitance (109.1 F g⁻¹) with a lower internal resistance and efficient charge transfer. This work provides an effective method to enhance the electrochemical performance of the MWrGO powders.

由于石墨烯的高导电性和大表面积，它已被广泛地用作高性能超级电容器的电极材料。因为常规的基于石墨烯的超级电容器以粉末形式使用还原的氧化石墨烯（rGO），所以粒径可能是影响超级电容器性能的重要因素之一。在这项研究中，研究了氧化石墨烯（GO）粉末的粒径对石墨烯基超级电容器的电化学性能的影响。在使用简单的微波辐射还原GO粉末后，将具有三种不同粒度分布的GO粉末用于电化学测试。在所有情况下，通过微波辐射合成的rGO粉末（MWrGO）的化学特性和比表面积几乎相同。^-1）具有较低的内部电阻和有效的电荷转移。这项工作提供了一种有效的方法来增强MWrGO粉末的电化学性能。