Study on thermal oxidation resistance of covalent organic frameworks based heteroatoms doped porous carbon

摘要

The B and N co-doped porous carbon (BN carbon) with excellent thermal oxidation resistance has been prepared through annealing covalent organic frameworks. The temperature at 10 wt%, 50 wt% weight loss and the maximum weight loss rate of BN carbon under air increase by 160, 302 and 189 degrees C, respectively. The mechanism for enhanced thermal oxidation resistance of BN carbon has also been investigated. The BN carbon with the suitable graphitization and oxidation degree, the high content of B atom and the low content of N atom shows the good thermal oxidation resistance. Besides, the B bonds including BC3, BC2O and B2O3 and N bonds including Prrolic-N, Graphitic-N show the good blocking effect on the active sites on carbon, leading to enhanced thermal oxidation resistance. (C) 2020 Published by Elsevier B.V.