Xiao Yana, Li Zihua, Xu Bingang
Nanotechnology Center, School of Fashion and Textiles, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, P. R. China.
ACS Appl Mater Interfaces. 2024 Mar 20;16(11):13674-13684. doi: 10.1021/acsami.3c17463. Epub 2024 Mar 8.
Flexible and stretchable triboelectric nanogenerators (TENGs) have been rapidly advanced owing to the demand for portable and wearable electronic devices that can work under universal or motional circumstances. While versatile materials can be applied in a TENG as dielectric materials, flexible and cost-effective electrodes are crucially important for the output performance of TENGs. Herein, we developed a poly(vinyl alcohol) (PVA) hydrogel TENG doped with a novel two-dimensional material, graphitic carbon nitride (g-CN), which could act as both a cost-effective flexible electrode and a positive dielectric for TENG with different morphologies. The measured peak-to-peak open-circuit voltage of the TENG reached 80 V at a dopant concentration of 2.7 wt % in single-electrode mode, which is far higher than that of the pristine PVA hydrogel TENG. As a demonstration of the application, the g-CN/PVA hydrogel TENG can be adopted as electronic skin to monitor the movement of the human body. Low-frequency mechanical energy-harvesting devices in different morphologies including discoid flake shape, tube shape, and spiral shape in the single-electrode mode or contact-separation mode have been designed, fabricated, and evaluated. All of these merits of the proposed hydrogel TENG after doping two-dimensional (2D) material g-CN have demonstrated their promising potential for versatile applications in biomechanical energy harvesting and self-powered sensing.
由于对可在通用或运动环境下工作的便携式和可穿戴电子设备的需求，柔性和可拉伸的摩擦电纳米发电机（TENGs）得到了迅速发展。虽然多种材料可作为介电材料应用于TENG中，但柔性且具有成本效益的电极对于TENG的输出性能至关重要。在此，我们开发了一种掺杂新型二维材料石墨相氮化碳（g-CN）的聚乙烯醇（PVA）水凝胶TENG，它既可以作为具有成本效益的柔性电极，又可以作为具有不同形态的TENG的正电介质。在单电极模式下，当掺杂浓度为2.7 wt%时，该TENG测得的峰峰值开路电压达到80 V，远高于原始PVA水凝胶TENG。作为应用演示，g-CN/PVA水凝胶TENG可被用作电子皮肤来监测人体运动。我们设计、制造并评估了单电极模式或接触-分离模式下不同形态的低频机械能收集装置，包括盘状薄片形状、管状和螺旋形状。掺杂二维（2D）材料g-CN后的这种水凝胶TENG的所有这些优点，都证明了它们在生物机械能收集和自供电传感方面具有广阔的应用潜力。
