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2-Methylimidazole Assisted Synthesis of Nanocrystalline Shell Reinforced PPy Hydrogel with High Mechanical and Electrochemical Performance
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2021-10-20 , DOI: 10.1016/j.cej.2021.133033
Shunhe Tang 1 , Chuying Yu 1 , Xinxin Liu 1 , Danchen Fu 1 , Wentao Liao 1 , Feng Xu 1 , Wenbin Zhong 1
Affiliation  

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-PPy3:3 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-PPy3:3 based flexible supercapacitor presents remarkable flexibility and mechanical stability, which can sustain 10000 bending cycles without severe degradation of electrochemical performance.



中文翻译:

2-甲基咪唑辅助合成具有高机械和电化学性能的纳米晶壳增强PPy水凝胶

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。

更新日期:2021-10-20
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