文献类型：期刊文献

英文题名：Vaporized Hydrothermal Functionalization of Carbon Fiber and Its Superior Supercapacitor Performance

作者：Zhao, Chongjun[1];Zheng, Jiexin[1];Wang, Yixuan[1];Rui, Pengfei[1];Yang, Guang[2];Zhao, Chunhua[1];Xu, Sijia[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Aerosp Power Technol Co LTD, Shanghai 201112, Peoples R China

年份：2022

卷号：36

期号：7

起止页码：4052

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20221411883688);WOS:【SCI-EXPANDED(收录号:WOS:000797939400058)】；

基金：We are grateful for the support of the National Natural Science Foundation of China (22075082), Natural Science Foundation of Shanghai (nos. 19ZR1413000 and 13ZR1411900), Shanghai Alliance Plan (nos. LM201881 and LM201751), Shanghai M-C Integration Development Project (JMRHCY-2020-006), Shanghai Leading Academic Discipline Project (B502), and Shanghai Key Laboratory Project (08DZ2230500). We also thank the Research Center of Analysis and Test of East China University of Science and Technology for the help on the characterization.

语种：英文

外文关键词：Chemical activation - Electrodes - Supercapacitor - Activated carbon

摘要：Carbon fibers are promising in directly being used as a freestanding electrode in flexible and wearable devices due to their high conductivity and good mechanical performance. However, those micrometer-sized carbon fibers usually suffer from disadvantages including poor activity and a low surface area due to an inert surface, solid structure, and high diameter (7-15 mu m). Traditional chemical activation methods in a liquid phase have a low efficiency and produce a vast waste solution. In this work, a vaporized hydrothermal oxidation process is proposed, in which vaporized functionalization of carbon fibers is completed during a hydrothermal process of 5 mL of aqueous solution containing 0.5 mL of nitric acid in a 100 mL autoclave. Combined with the subsequent aerobic pyrolysis process, this vaporized hydrothermal method converts smooth and inert carbon fibers into porous and activated carbon fibers, accompanied by a decrease of their diameter from 6.9 to 2.7 mu m. Consequently, functionalized carbon fiber directly used as an electrode exhibits a high mass specific capacitance of 118.97 F g(-1) (vs 0.217 F g(-1 )for pristine CF) whereas its symmetric supercapacitor delivers an energy density of 6.5 W h kg(-1 )and a maximum power density of 5000 W kg(-)(1).