Recently, multifunctional materials have received widespread attention from researchers. Cellulose nanofibers (CNF) is one of biomass materials with abundant hydroxyl groups, which shows great potential in manufacturing multifunctional composite material. In this paper, a kind of polyaniline@CNF/polyvinyl alcohol-H2SO4 multifunctional composite material (PANI@CNF/PVA-H2SO4) was successfully designed by in-situ chemical polymerization of conductive polyaniline (PANI) onto CNF aerogel with high aspect ratio, and then coated with PVA-H2SO4 gel. The composite material has a specific capacitance of 502.2 F/g at a scan rate of 5 mV/s as supercapacitor electrode. Furthermore, when the composite was assembled into a symmetrical supercapacitor, it can still provide an energy density of 11.49 W·h/kg at a high power density of 413.55 W/kg. Besides, the as-obtained PANI@CNF/PVA-H2SO4 composite has an excellent electromagnetic shielding performance of 34.75 dB in X-band. In addition, due to the excellent flexibility of CNF and PVA, the PANI@CNF/PVA-H2SO4 composites can be further applied to stress sensors to detect pressure and human motion signals.

中文翻译：

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Polyaniline@cellulose 纳米纤维多功能复合材料，用于超级电容器、电磁干扰屏蔽和传感


近年来，多功能材料受到了研究人员的广泛关注。纤维素纳米纤维 （CNF） 是一种羟基丰富的生物质材料，在制造多功能复合材料方面显示出巨大的潜力。本文通过将导电聚苯胺 （PANI） 原位化学聚合到高长径比的 CNF 气凝胶上，然后涂覆 PVA-H2SO4 凝胶，成功设计了一种polyaniline@CNF/聚乙烯醇-H2SO4 多功能复合材料 （PANI@CNF/PVA-H2SO4）。该复合材料在扫描速率为 5 mV/s 时具有 502.2 F/g 的比电容作为超级电容器电极。此外，当复合材料组装成对称超级电容器时，它仍然可以在 413.55 W/kg 的高功率密度下提供 11.49 W·h/kg 的能量密度。此外，所制备的 PANI@CNF/PVA-H2SO4 复合材料在 X 波段具有 34.75 dB 的优异电磁屏蔽性能。此外，由于 CNF 和 PVA 具有出色的柔韧性，PANI@CNF/PVA-H2SO4 复合材料可以进一步应用于应力传感器，以检测压力和人体运动信号。