Han Jing, Xu Chongyang, Zhang Jintao, Xu Nuo, Xiong Yao, Cao Xiaole, Liang Yuchen, Zheng Li, Sun Jia, Zhai Junyi, Sun Qijun, Wang Zhong Lin
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 101400, P. R. China.
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
ACS Nano. 2021 Jan 26;15(1):1597-1607. doi: 10.1021/acsnano.0c09146. Epub 2021 Jan 11.
Fibrous energy-autonomy electronics are highly desired for wearable soft electronics, human-machine interfaces, and the Internet of Things. How to effectively integrate various functional energy fibers into them and realize versatile applications is an urgent need to be fulfilled. Here, a multifunctional coaxial energy fiber has been developed toward energy harvesting, energy storage, and energy utilization. The energy fiber is composed of an all fiber-shaped triboelectric nanogenerator (TENG), supercapacitor (SC), and pressure sensor in a coaxial geometry. The inner core is a fibrous SC by a green activation strategy for energy storage; the outer sheath is a fibrous TENG in single-electrode mode for energy harvesting, and the outer friction layer and inner layer (covered with Ag) constitute a self-powered pressure sensor. The electrical performances of each energy component are systematically investigated. The fibrous SC shows a length specific capacitance density of 13.42 mF·cm, good charging/discharging rate capability, and excellent cycling stability (∼96.6% retention). The fibrous TENG shows a maximum power of 2.5 μW to power an electronic watch and temperature sensor. The pressure sensor has a good enough sensitivity of 1.003 V·kPa to readily monitor the real-time finger motions and work as a tactile interface. The demonstrated energy fibers have exhibited stable electrochemical and mechanical performances under mechanical deformation, which make them attractive for wearable electronics. The demonstrated soft and multifunctional coaxial energy fiber is also of great significance in a sustainable human-machine interactive system, intelligent robotic skin, security tactile switches,
纤维状能量自主电子器件在可穿戴柔性电子、人机接口和物联网领域具有很高的需求。如何有效地将各种功能能量纤维集成到其中并实现多功能应用是亟待解决的问题。在此，我们开发了一种多功能同轴能量纤维，用于能量收集、能量存储和能量利用。该能量纤维由全纤维状摩擦纳米发电机（TENG）、超级电容器（SC）和压力传感器以同轴结构组成。内核是通过绿色活化策略制备的用于能量存储的纤维状SC；外鞘是单电极模式下用于能量收集的纤维状TENG，外摩擦层和内层（覆盖有Ag）构成自供电压力传感器。系统研究了各能量组件的电学性能。纤维状SC表现出13.42 mF·cm的长度比电容密度、良好的充放电速率能力和优异的循环稳定性（约96.6%的保持率）。纤维状TENG表现出2.5 μW的最大功率，可为电子手表和温度传感器供电。压力传感器具有足够好的1.003 V·kPa的灵敏度，能够轻松监测实时手指运动并用作触觉接口。所展示的能量纤维在机械变形下表现出稳定的电化学和机械性能，这使其在可穿戴电子领域具有吸引力。所展示的柔软且多功能的同轴能量纤维在可持续人机交互系统、智能机器人皮肤、安全触觉开关方面也具有重要意义。
