Aqueous redox-active electrolytes can provide a significant improvement in electric energy storage for electrochemical capacitors. Herein, we report a novel hybrid capacitor consisting of porous polypyrrole/reduced graphene oxide (PPy/rGO-HT) composite electrodes and an aqueous electrolyte with hydroquinone redox-active species. A hydrothermal-assisted synthesis of the PPy/rGO-HT composite allowed to obtain a porous polymer-graphene composite with a high specific surface area of 597 m² g⁻¹. In a three-electrode configuration with the redox-active electrolyte, PPy/rGO-HT exhibits better electrochemical performance in terms of specific capacity and cycling stability compared with that of pristine rGO. An assembled symmetric device achieves excellent long-term stability and a specific energy of 6.5 Wh kg⁻¹, indicating the potential of hybrid systems for energy storage applications.

水性氧化还原活性电解质可以显着改善电化学电容器的电能存储。在这里，我们报告了一种新型的混合电容器，该电容器由多孔聚吡咯/氧化石墨烯（PPy / rGO-HT）复合电极和具有氢醌氧化还原活性物质的水性电解质组成。PPy / rGO-HT复合材料的水热辅助合成可以得到具有597 m ²  g ^-1的高比表面积的多孔聚合物-石墨烯复合材料。与原始rGO相比，在具有氧化还原活性电解质的三电极配置中，PPy / rGO-HT在比容量和循环稳定性方面表现出更好的电化学性能。组装好的对称设备具有出色的长期稳定性和6.5 Wh kg ^-1的比能，表明混合系统在储能应用中的潜力。