Electroactive and conductive hydrogels with porous network structure, super hydrophilicity, mechanical flexibility and biocompatibility are prominent electrode materials for flexible/wearable supercapacitors. In this work, novel PPy hydrogels (m-PPy) with crystalline core-shell structure have been facilely fabricated with assistance of 2-methylimidazole via one-step oxidative polymerization. The m-PPy hydrogels exhibit significantly improved recoverable compressive strength of up to 26.7 kPa at 50% strain and remarkable maximum compressive strength of up to 265 kPa, due to effective energy dissipation by nanocrystalline shells. The m-PPy_3:3 exhibits high specific capacitance of 536 F g^-1 and corresponding symmetric supercapacitor possesses superior areal specific capacitance of 603 mF cm^-2, good rate capability and superb areal energy density of 53.6 μWh cm^-2. Particularly, m-PPy_3:3 based flexible supercapacitor presents remarkable flexibility and mechanical stability, which can sustain 10000 bending cycles without severe degradation of electrochemical performance.

具有多孔网络结构、超亲水性、机械柔韧性和生物相容性的电活性和导电水凝胶是柔性/可穿戴超级电容器的重要电极材料。在这项工作中，在 2-甲基咪唑的帮助下，通过一步氧化聚合制备了具有结晶核壳结构的新型 PPy 水凝胶（m-PPy）。由于纳米晶壳的有效能量耗散，m-PPy 水凝胶在 50% 应变下表现出高达 26.7 kPa 的显着改善的可恢复压缩强度和高达 265 kPa 的显着最大压缩强度。m-PPy _3:3表现出 536 F g ^{-1 的}高比电容相应的对称超级电容器具有603 mF cm ^{-2 的}优异面比电容、良好的倍率性能和53.6 μWh cm ^{-2 的}优异面能量密度。特别是，基于m-PPy _3:3的柔性超级电容器具有显着的柔韧性和机械稳定性，可承受 10000 次弯曲循环而不会严重降低电化学性能。