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Bromine‐Functionalized Covalent Organic Frameworks for Efficient Triboelectric Nanogenerator
Author(s) -
Zhai Lipeng,
Cui Siwen,
Tong Boli,
Chen Weihua,
Wu Zijie,
Soutis Constantinos,
Jiang Donglin,
Zhu Guangshan,
Mi Liwei
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202000722
Subject(s) - triboelectric effect , nanogenerator , bromine , materials science , crystallinity , covalent bond , nanotechnology , porosity , surface modification , optoelectronics , chemical engineering , chemistry , organic chemistry , composite material , engineering , piezoelectricity , metallurgy
Covalent organic frameworks (COFs) enable precise integration of various organic building blocks into porous skeletons through topology predesign. Here, we report the first example of COFs by integrating electron withdrawing bromine group onto the skeletons for triboelectric nanogenerators (TENG). The resulting framework exhibits high surface area and good crystallinity. Thus, the bromine functionalized COF has more regular aligned π columns and arrays over the skeleton than bare COFs, which in turn significantly enhances charge transport ability. As a result, bromine functionalized COFs showed higher electrical output performance at 5 Hz with a peak value of short circuit current density of 43.6 μA and output voltage of 416 V, which is 2 and 1.3 times higher than those of bare COFs (21.6 μA and 318 V), respectively. These results demonstrated that this strategy for engineering electron withdrawing groups on the skeleton could open a new aspect of COFs for developing TENG devices.