Flexible freestanding conductive nanopaper based on PPy:PSS nanocellulose composite for supercapacitors with high performance
Flexible freestanding conductive nanopaper based on PPy:PSS nanocellulose composite for supercapacitors with high performance
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DOI：
10.1007/s40843-022-2225-x
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Yue Liang;Zhen Wei;Hung-En Wang;Ruigang Wang;Xinyu Zhang
中科院分区：
文献类型：
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作者：
Yue Liang;Zhen Wei;Hung-En Wang;Ruigang Wang;Xinyu Zhang
首次通过低成本、简单、快速的真空过滤方法成功制备了独立式、无粘合剂的柔性聚吡咯：聚苯乙烯磺酸/纤维素纳米纸（PPy:PSS/CNP）电极。 CNP的分级结构具有高表面积和良好的机械强度，不仅提供了高电活性区域并缩短了电解质离子的扩散距离，而且减轻了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 下表现出 3.8 F cm−2 的高面积比电容（相当于 475 F cm−3 和 240 F g−1）和良好的循环稳定性（5000 次循环后电容保持率为 80.9%）。 PPy:PSS/CNP在不同弯曲角度下的循环伏安曲线表明该电极具有突出的柔韧性和电化学稳定性。此外，组装了对称超级电容器装置，并在4.4 mW cm−2（550 mW cm−3）的功率密度下提供了122 µ cm−2（15 W h cm−3）的高面能量密度，优于其他纤维素基材料。 PPy: PSS/CNP 电极集高超级电容性能、灵活性、易于制造和廉价于一身，为开发下一代绿色、经济的便携式和可穿戴消费电子产品提供了巨大的潜力。
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 of 3.8 F cm−2(corresponding to 475 F cm−3and 240 F g−1) at 10 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 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.