基于PPy:PSS纳米纤维素复合材料的高性能柔性独立导电纳米纸用于超级电容器  

Flexible freestanding conductive nanopaper based on PPy:PSS nanocellulose composite for supercapacitors with high performance

作　　者：梁月 魏震 王鸿恩 王瑞刚 张新宇 Yue Liang;Zhen Wei;Hung-En Wang;Ruigang Wang;Xinyu Zhang(Department of Chemical Engineering,Auburn University,Auburn,AL 36849,USA;Department of Metallurgical and Materials Engineering,The University of Alabama,Tuscaloosa,AL 35487,USA)

机构地区：[1]Department of Chemical Engineering,Auburn University,Auburn,AL 36849,USA [2]Department of Metallurgical and Materials Engineering,The University of Alabama,Tuscaloosa,AL 35487,USA

出　　处：《Science China Materials》2023年第3期964-973,共10页中国科学（材料科学（英文版）

基　　金：supported by the National Science Foundation(CMMI-2113948);Liang Y acknowledges the financial support from China Scholarship Council(201708510080).

摘　　要：本工作通过低成本、简单、快速的真空过滤方法首次成功制备了一种独立的、无粘合剂的柔性聚吡咯:聚磺苯乙烯/纤维素纳米纸电极(PPy:PSS/CNP).多层结构的纤维素纳米纸具有较高的表面积和良好的机械强度,不仅提供了高的电活性区域,缩短了电解质离子的扩散距离,而且还阻止了PPy在充电/放电过程中的体积膨胀/收缩.优化后的PPy:PSS/CNP在10 mV s-1时表现出3.8 F cm-2(对应于475 F cm-3和240 F g-1)的高比电容和良好的循环稳定性(在5000次循环后有80.9%的电容保持率).PPy:PSS/CNP在不同弯曲角度下的循环伏安曲线表明电极具有突出的柔韧性和电化学稳定性.此外,组装的对称超级电容器器件在功率密度为4.4 m W cm-2(550 m W c m-3)的情况下,提供了122μW h cm-2(15 W h cm-3)的高面积能量密度,这个值优于其他基于纤维素电极材料制备的器件.PPy:PSS/CNP电极结合了高电容性能、灵活性、易于制造和廉价多个优势,为开发下一代绿色、经济便携式和可穿戴电子产品提供了巨大潜力.A freestanding,binder-free flexible polypyrrole polystyrene sulfonate/cellulose nanopaper (PPy:PSS/CNP)electrode is successfully fabricated by a low-cost,simple,and fast vacuum filtration method for the first time.The hierarchical structure of CNP with high surface area and good mechanical strength not only provides a high electroactive region and shortens the diffusion distance of electrolyte ions but also mitigates the volumetric expansion/shrinkage of the PPy during the charging/discharging process.The optimized PPy:PSS/CNP exhibits a high areal specific capacitance of3.8 F cm-2(corresponding to 475 F cm-3and 240 F g-1) at10 mV s-1and good cycling stability (80.9%capacitance retention after 5000 cycles).The cyclic voltammetry curves of PPy:PSS/CNP at different bending angles indicate prominent flexibility and electrochemical stability of the electrode Moreover,a symmetric supercapacitor device is assembled and delivers a high areal energy density of 122μW h cm-2(15 W h cm-3) at a power density of 4.4 m W cm-2(550 m W cm-3),which is superior to other cellulose-based materials.The combination of high supercapacitive performance,flexibility,easy fabrication,and cheapness of the PPy PSS/CNP electrodes offers great potential for developing the next generation of green and economical portable and wearable consumer electronics.

关 键 词：超级电容器 电化学稳定性 纳米纸 真空过滤 能量密度 电子产品 体积膨胀 电容性能 

分 类 号：TM53[电气工程—电器] TB332[一般工业技术—材料科学与工程]