An Electrochemically Stable 2D Covalent Organic Framework for High-performance Organic Supercapacitors  

作　　者：Rashid Iqbal Amir Badshah Ying-Jie Ma Lin-Jie Zhi 

机构地区：[1]CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,National Center for Nanoscience and Technology,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of chemistry,Kohat University of Science and Technology,Khyber Pakhtunkhwa,Pakistan

出　　处：《Chinese Journal of Polymer Science》2020年第5期558-564,I0008,共8页高分子科学（英文版）

基　　金：supported by the Ministry of Science and Technology of China(No.2012CB933403);Beijing Natural Science Foundation(No.2182086);the National Natural Science Foundation of China(Nos.51425302 and 51302045);CAS-TWAS President's PhD Fellowship program,the Beijing Municipal Science and Technology Commission(No.Z121100006812003)the Chinese Academy of Sciences.

摘　　要：An electrochemically stable two-dimensional covalent organic framework,PI-COF,has been synthesized by a scalable solvothermal method.PI-COF possesses a highly crystalline structure,well-defined pores,high specific surface area,and cluster macrostructure.Thanks to these features,PI-COF can work as electrode materials in organic supercapacitors,exhibiting a specific capacitance of 163 F/g at 0.5 A/g over a wide potential window of 0-2.5 V.Moreover,PI-COF shows excellent rate performance,which can deliver 96 F/g even at a high current density of 40 A/g.Because of the high capacitance and wide potential window,PI-COF has achieved a superior energy density of 35.7 W h/kg at a power density of 250 W/kg.Most importantly,due to the remarkable electrochemical stability,the PI-COF based device shows outstanding cycling stability with 84.1%capacitance maintained(137 F/g)after 3.0×10^4 charged/discharged cycles at 1 A/g.This work should shed light on designing new COF-based electrode materials for and other electrochemical devices.

关 键 词：2D COFs Electrochemically stable Electrode materials High energy density Organic supercapacitors 

分 类 号：TM53[电气工程—电器] O641.4[理学—物理化学]