College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China; Christopher Ingold Laboratory, Department of Chemistry, University College London, London WC1H0A, UK.
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China.
Int J Biol Macromol. 2024 Sep;276(Pt 1):134152. doi: 10.1016/j.ijbiomac.2024.134152. Epub 2024 Aug 4.
Fiber-shaped Zn-ion capacitors (FSZICs) have shown great potential in wearable electronics due to their long cycle life, high energy density, and good flexibility. Nevertheless, it is still a critical challenge to develop a conductive fiber with long size and high mechanical properties as the FSZIC cathode using sustainable and low-cost materials. Herein, regenerated cellulose (RC) -based conductive microfibers are prepared by a simple, continuous, and scalable wet spinning process. The 3D nanoporous networks of RC caused by physical self-cross-linking allow MXene and MnO to be uniformly and firmly embedded. The rapid extrusion and limited drying result in the highly aligned structure of the fibers, endowing the hybrid fiber with an ultra-high tensile strength (145.83 Mpa) and Young's modulus (1672.11 Mpa). MXene/MnO-RC-based FSZIC demonstrates a high specific capacitance of 110.01 mF cm, an energy density of 22.0 mWh cm at 0.57 A cm and excellent cycling stability with 90.5 % capacity retention after 5000 cycles. This work would lead to a great potential of cellulose for application in next-generation green and wearable electronics.
纤维状锌离子电容器（FSZIC）由于其长循环寿命、高能量密度和良好的柔韧性，在可穿戴电子产品中显示出巨大的潜力。然而，使用可持续和低成本的材料开发具有长尺寸和高机械性能的纤维作为 FSZIC 阴极仍然是一个关键挑战。在此，通过一种简单、连续和可扩展的湿法纺丝工艺制备了基于再生纤维素（RC）的导电微纤维。RC 的 3D 纳米多孔网络通过物理自交联允许 MXene 和 MnO 均匀且牢固地嵌入。快速挤出和有限的干燥导致纤维具有高度取向的结构，赋予混合纤维超高的拉伸强度（145.83 MPa）和杨氏模量（1672.11 MPa）。基于 MXene/MnO-RC 的 FSZIC 表现出 110.01 mF cm 的高比电容、在 0.57 A cm 时 22.0 mWh cm 的能量密度以及优异的循环稳定性，在 5000 次循环后容量保持率为 90.5%。这项工作将为纤维素在下一代绿色和可穿戴电子产品中的应用带来巨大的潜力。
