| Affiliation: | 1. Center for Advanced Materials Research, Zhongyuan University of Technology, Zhengzhou, 450007 P. R. China These authors contributed equally to this work.;2. College of Chemistry, Zhengzhou University, Zhengzhou, 450001 P. R. China;3. North West Composites Center, School of Materials, University of Manchester, Manchester, M13 9PL UK;4. Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore, 117543 Singapore;5. Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, 130024 P. R. China;6. Center for Advanced Materials Research, Zhongyuan University of Technology, Zhengzhou, 450007 P. R. China |
| Abstract: | 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. |
