Pan Liang, Wang Ying, Jin Qiuyi, Luo Yulin, Zhou Zhe, Zhu Meifang
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
Carbohydr Polym. 2024 Dec 15;346:122607. doi: 10.1016/j.carbpol.2024.122607. Epub 2024 Aug 14.
Integrating flexible piezoelectric nanogenerators (PENGs) into wearable and portable electronics offers promising prospects for motion monitoring. However, it remains a significant challenge to develop environmentally friendly PENGs using biodegradable and cost-effective natural polymers for mechanical energy harvesting and self-powered sensing. Herein, reduced graphene oxide (rGO) and barium titanate (BTO) were introduced into regenerated cellulose pulp to fabricate a composite porous film-based PENG. The incorporation of rGO not only increased the electrical conductivity of the porous film but also enhanced the dispersibility of BTO. Moreover, the unique pore structure of the composite porous film improved the polarization effect of the air inside the pores, thereby greatly boosting the overall piezoelectric performance. The piezoelectric coefficient of the resulting composite porous film reaches up to 41.5 pC·N, which is comparable to or higher than those reported in similar studies. Consequently, the PENG assembled from this cellulose/rGO/BTO composite porous film (CGB-PENG) achieved an output voltage of 47 V, a current of 4.6 μA, and a power density of 30 μW·cm, approximately three times the output voltage and ten times the power density of similar studies. This work presents a feasible approach for the fabrication of high-performance cellulose-based PENGs derived from recycled waste cotton textiles.
将柔性压电纳米发电机（PENGs）集成到可穿戴和便携式电子产品中，为运动监测提供了广阔前景。然而，使用可生物降解且经济高效的天然聚合物来开发用于机械能收集和自供电传感的环保型PENGs仍然是一项重大挑战。在此，将还原氧化石墨烯（rGO）和钛酸钡（BTO）引入再生纤维素纸浆中，以制备基于复合多孔膜的PENG。rGO的加入不仅提高了多孔膜的电导率，还增强了BTO的分散性。此外，复合多孔膜独特的孔结构改善了孔内空气的极化效应，从而极大地提高了整体压电性能。所得复合多孔膜的压电系数高达41.5 pC·N，与类似研究中报道的数值相当或更高。因此，由这种纤维素/rGO/BTO复合多孔膜（CGB-PENG）组装而成的PENG实现了47 V的输出电压、4.6 μA的电流和30 μW·cm的功率密度，输出电压约为类似研究的三倍，功率密度为十倍。这项工作为从回收废棉纺织品中制备高性能纤维素基PENGs提供了一种可行的方法。
