Poor rate capability and cycling stability are the major bottlenecks which hinder the application of polypyrrole (PPy) as the supercapacitor electrode material. Herein, a series of nano-sheet PPy/reduced graphene oxide (rGO) composites are synthesized with rGO as support frameworks to optimize the morphology, specific surface area and electronic conductivity, consequently enhancing the rate capability and cycling stability. Voltammetric charge analysis and Peukert's equation are introduced to evaluate their capacitance performance. The results confirm that rGO obviously enhances the outer charge (up to 90% of the total charge), which is corresponding to the large outer electrochemical surface and rapid ion storage/release. Peukert's constant is determined with electrochemical impedance spectroscopy and the value for PPy/rGO-10 is close to the ideal value of 1 (1.02), implying a proximate ideal capacitive behavior. The large outer charge and proximate ideal capacitive behavior can greatly improve its capacitance performance, especially under rapid charging/discharging processes. Consequently, a high specific capacitance of 290 F g⁻¹ is obtained for PPy/rGO-10 at 0.2 A g⁻¹, retaining 247 F g⁻¹ (85.2%) at 12.8 A g⁻¹. Additionally, its capacitance retention of 97.5% can be achieved after 20000 cycles at a current density of 2 A g⁻¹, exhibiting excellent cycling stability with a tiny over-oxidation degree increase.

差的速率能力和循环稳定性是阻碍将聚吡咯（PPy）用作超级电容器电极材料的主要瓶颈。本文以rGO为载体，合成了一系列纳米片状的PPy /氧化石墨烯（rGO）复合材料，以优化其形貌，比表面积和电导率，从而提高了速率能力和循环稳定性。引入了伏安电荷分析和Peukert方程来评估其电容性能。结果证实，rGO明显增强了外部电荷（高达总电荷的90％），这对应于较大的外部电化学表面和快速的离子存储/释放。Peukert' s常数由电化学阻抗谱确定，PPy / rGO-10的值接近于理想值1（1.02），这意味着接近理想的电容行为。大的外部电荷和接近理想的电容性能可以极大地改善其电容性能，尤其是在快速充电/放电过程中。因此，具有290 F g的高比电容^-1是在0.2 A g下的PPy / RGO-10得到^-1，保持247 F G ^-1 12.8甲克（85.2％）^-1。另外，在2A g ^-1的电流密度下，经过20000次循环后，其电容保持率为97.5％，显示出优异的循环稳定性，并且过氧化度的增加很小。