Abstract
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 of 3.8 F cm−2 (corresponding to 475 F cm−3 and 240 F g−1) at 10 mV s−1 and 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 122 µ cm−2 (15 W h cm−3) at a power density of 4.4 mW cm−2 (550 mW 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.
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 mW cm−2(550 mW cm−3)的情况下, 提供了122 µW 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.
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Acknowledgements
This work was partially supported by the National Science Foundation (CMMI-2113948). Liang Y acknowledges the financial support from China Scholarship Council (201708510080).
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Author contributions Zhang X conceived the idea. Liang Y designed and performed the experiments with the help from Wang HE. Wei Z performed the SEM test. Liang Y analyzed the data and drafted the manuscript. Zhang X and Wang R supervised the whole research. All authors participated in the general discussion.
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Yue Liang received her master’s degree from China West Normal University in June 2017. Since 2018, she has been studying as a doctoral candidate in the group of Prof. Xinyu Zhang at the Department of Chemical Engineering, Auburn University. Her research interests mainly focus on microwave-initiated ultrafast nanomanufacturing for hierarchical, multifunctional nanomaterials and nanocomposites, and the fabrication of flexible electrodes based on conducting polymers.
Ruigang Wang received his doctorate with Prof. Peter Crozier and Dr. Renu Sharma in materials science and engineering from Arizona State University in 2007. In August 2016, he joined the Department of Metallurgical and Materials Engineering, The University of Alabama as an associate professor. His research mainly focuses on shape/size-controlled synthesis of metal oxides, emission control catalysts, support structure effect in metal-oxide catalysis, materials for energy capture, storage and conversion, metal recycling, and high temperature ceramics processing.
Xinyu Zhang received his doctorate with Prof. Alan G. MacDiarmid and Dr. Sanjeev K. Manohar in materials chemistry from the University of Texas at Dallas in 2005. He is a professor in chemical engineering at Auburn University and his research mainly focuses on microwave-initiated ultrafast nanomanufacturing for hierarchical, multifunctional nanomaterials and nanocomposites, multifunctional polymer coating for anti-corrosion and antimicrobial applications, and green approach to conducting polymer-based nanocomposites for catalysis, sensing and energy storage applications.
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Flexible freestanding conductive nanopaper based on PPy:PSS nanocellulose composite for supercapacitors with high performance
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Liang, Y., Wei, Z., Wang, HE. et al. Flexible freestanding conductive nanopaper based on PPy:PSS nanocellulose composite for supercapacitors with high performance. Sci. China Mater. 66, 964–973 (2023). https://doi.org/10.1007/s40843-022-2225-x
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DOI: https://doi.org/10.1007/s40843-022-2225-x