Chen Xin-Xin, Ju Yu-Xiong, Zhang Bei, Ge Xiao-Rui, Liu En-Jiang, Zhang Dong-Yang, Wang Jun, Yao Xiao-Hui, Zhao Wei-Guo, Chen Tao
Jiangsu Key Laboratory of Sericultural and Animal Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; Key Laboratory of Silkworm and Mulberry Genetic Improvement, Ministry of Agriculture and Rural Affairs, Sericultural Scientific Research Center, Chinese Academy of Agricultural Sciences, Zhenjiang 212100, China.
Jiangsu Key Laboratory of Sericultural and Animal Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; Key Laboratory of Silkworm and Mulberry Genetic Improvement, Ministry of Agriculture and Rural Affairs, Sericultural Scientific Research Center, Chinese Academy of Agricultural Sciences, Zhenjiang 212100, China.
Int J Biol Macromol. 2025 Mar;292:139208. doi: 10.1016/j.ijbiomac.2024.139208. Epub 2024 Dec 26.
Most of the developed flexible hydrogel supercapacitors struggle to maintain their electrochemical stability and structural integrity under tensile strain. Therefore, developing a flexible supercapacitor with excellent mechanical properties and stable electrochemical performance under different strains remains a challenge. Based on the previous cartilage-like structure, we designed a new coarse nanofiber bundle and ordered network. A coarse nanofiber bundle and ordered network skeleton was constructed by directional freezing and filled with polyvinyl alcohol (PVA) to serve as a soft matrix to prepare PVA-SNF-CNTs-PPy-3 hydrogel electrode, which has high tensile strength (6.22 MPa) and fatigue threshold (8759.8 J/m). In addition, the loading of carbon nanotubes and polypyrrole onto the SNF-ordered network enabled the conductive material to form an ordered conductive energy storage network along the skeleton, providing an area-specific capacitance of up to 23.96 F/cm. The coarse nanofiber bundle and ordered network provided supercapacitors with the least capacitance consumption under 150 % deformation, and the capacitance retention was >98.2 %. After repeated stretching (3000 times), the capacitance remained >91.45 %. This study provides new ideas for the development of flexible supercapacitors with high capacitance and high mechanical reliability.
大多数已开发的柔性水凝胶超级电容器在拉伸应变下难以保持其电化学稳定性和结构完整性。因此，开发一种在不同应变下具有优异机械性能和稳定电化学性能的柔性超级电容器仍然是一项挑战。基于先前的类软骨结构，我们设计了一种新的粗纳米纤维束和有序网络。通过定向冷冻构建了粗纳米纤维束和有序网络骨架，并用聚乙烯醇（PVA）填充作为软基质，制备了具有高拉伸强度（6.22MPa）和疲劳阈值（8759.8J/m）的PVA-SNF-CNTs-PPy-3水凝胶电极。此外，碳纳米管和聚吡咯负载到SNF有序网络上，使导电材料能够沿着骨架形成有序的导电储能网络，提供高达23.96F/cm的面积比电容。粗纳米纤维束和有序网络使超级电容器在150%变形下的电容消耗最小，电容保持率>98.2%。经过反复拉伸（3000次）后，电容仍>91.45%。本研究为开发具有高电容和高机械可靠性的柔性超级电容器提供了新思路。
