The growing demands of flexible and wearable electronic devices boost the rapid development of flexible supercapacitors (FSCs). Conductive hydrogels are considered to be one type of promising electrode materials for FSCs due to their good processability and electrochemical properties. However, the poor mechanical properties of conductive hydrogels hinder their practical applications. Building robust cross-linked network structures is a feasible way to enhance their mechanical properties. Herein, the double-network polyvinyl alcohol (PVA)-polypyrrole (PPy) conductive hydrogels are synthesized by the freeze–thaw and in-situ polymerization method. The double-network structure not only enhances mechanical properties of the hydrogels, but also promotes their electrolyte ion transport. The maximum elongation at break of the optimized PVA-PPy hydrogels can reach 156.4%, and the specific capacitance is 1718.7 mF cm⁻² at 0.5 mA cm⁻². Furthermore, the energy densities of the symmetrical PVA-PPy FSCs are 46.7 and 13.3 μWh cm⁻² at power densities of 200.0 and 2000.0 μW cm⁻². Such excellent electrochemical performances and mechanical properties make the synthesized PVA-PPy hydrogels a promising candidate for FSCs.

柔性和可穿戴电子设备日益增长的需求推动了柔性超级电容器（FSC）的快速发展。导电水凝胶由于其良好的加工性能和电化学性能而被认为是一种有前景的 FSC 电极材料。然而，导电水凝胶较差的机械性能阻碍了其实际应用。构建坚固的交联网络结构是增强其机械性能的可行方法。本文通过冻融和原位聚合方法合成了双网络聚乙烯醇（PVA）-聚吡咯（PPy）导电水凝胶。双网络结构不仅增强了水凝胶的机械性能，还促进了其电解质离子传输。优化后的PVA-PPy水凝胶的最大断裂伸长率可达156.4%，0.5 mA cm ^{-2下的比电容为1718.7 mF cm -2}。此外，在功率密度为200.0和2000.0 μW cm ^-2时，对称PVA-PPy FSC的能量密度分别为46.7和13.3 μWh cm ^-2。如此优异的电化学性能和机械性能使合成的 PVA-PPy 水凝胶成为 FSC 的有前途的候选者。