An underwater flag-like triboelectric nanogenerator for harvesting ocean current energy under extremely low velocity condition. (December 2021)

• Record Type: Journal Article
• Authors: Wang, Yan; Liu, Xiangyu; Chen, Tianyu; Wang, Hao; Zhu, Chuanqing; Yu, Hongyong; Song, Liguo; Pan, Xinxiang; Mi, Jianchun; Lee, Chengkuo; Xu, Minyi
• Is Part Of: Nano energy. Volume 90(2021)Part A
• Publication Date: 2021-12
• Subjects: Blue energy -- Triboelectric nanogenerator -- Flow-induced vibration -- Energy harvester; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2021.106503
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Ocean current energy harvester is a promising infrastructure to achieve self-powered marine wireless sensing system. This study proposes and investigates an underwater flag-like Triboelectric Nanogenerator (UF-TENG) based on the flow-induced vibration. The UF-TENG consists of two conductive ink-coated polyethylene terephthalate membranes and one strip of poly tetra fluoroethylene membrane with their edges sealed up by a waterproof PTFE tape. In this way, the triboelectric layers are prevented from contacting water. It is verified that the vortex street induced by a cylinder enhances the vibration of the UF-TENG. The low velocity startup enables the UF-TENG to harvest extremely low-velocity ocean current energy, e.g., presently achieving 0.133 m/s as the critical startup velocity. The proposed UF-TENG has a simpler structure and better low velocity performance when comparing with electromagnetic generators and piezoelectric generators. Parametric studies are conducted to evaluate the influence of geometrical parameters of the UF-TENG on the vibration behavior and output performance. It is demonstrated that the underwater electrical appliance can be powered by parallel UF-TENG units. The present UF-TENG is a more cost-effective and more accessible hydroelectric technology to utilize the renewable ocean current for powering sensors or micro electric appliances in Internet of Things. Graphical Abstract: ga1 Highlights: An underwater flag-like triboelectric nanogenerator is proposed for harvesting ocean current energy. The flow-induced vibration of the UF-TENG are investigated along with the electrical output performance. The UF-TENG can yield a lower critical velocity which is a significant advantage in harvesting low-velocity ocean currents. The UF-TENG provides a potential method for powering underwater electrical appliances.