Rongmei Wang, Zixing Zhang, Jie Qin, Qiufeng Meng, Yong Du, Fan Zhang
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引用次数: 0
Abstract
Polymer-based thermoelectric (TE) films feature several prominent merits, involving available multi-component compositions, versatile patterning fabrication, and readily integration. Therefore, these materials hold a huge potential as the continuous power supply for wearable devices. Herein, we reported the preparation of a series of vinylene-linked triazole-cored covalent organic frameworks (COFs) by Knoevenagel condensation of 2, 4, 6-trimethyl-1, 3, 5-triazine as the core monomer. The as-prepared COFs tend to generate the nano- or micro-fiber morphologies with tunable lengths and diameters through changing the polyphenylene building blocks. Accordingly, these COF fibers could be readily composited with single-walled carbon nanotubes (SWCNTs) to form the flexible free-standing films upon a simple vacuum filtration method. A film sample containing 30 wt% g-C18N3-COF exhibited the highest power factor of 68.93 μW/(m K2) at 420 K. The manipulated 4-leg flexible thermoelectric generator (f-TEG) released a maximum output power and power density of 343.5 nW and 0.32 W/m2 at a temperature difference of 35 K. After bending for 1000 times at a radius of 15 mm, the resistance change rate of the as-fabricated f-TEGs was less than 5%, exhibiting excellent stability and flexibility. This work might not only broaden the potential application scope of COF materials but also provide a new fabrication strategy towards energy harvesting.
期刊介绍:
Advanced Fiber Materials is a hybrid, peer-reviewed, international and interdisciplinary research journal which aims to publish the most important papers in fibers and fiber-related devices as well as their applications.Indexed by SCIE, EI, Scopus et al.
Publishing on fiber or fiber-related materials, technology, engineering and application.