Additive-free porous assemblies of Ti3C2Tx by freeze-drying for high performance supercapacitors  

作　　者：Yue Yang Lili Wu Lu Li Shuangyan Lin Lina Bai Xinzhi Ma Zhitao Shao Xitian Zhang 

机构地区：[1]Key Laboratory for Photonic and Electronic Bandgap Materials,Ministry of Education,School of Physics and Electronic Engineering,Harbin Normal University,Harbin 150025,China [2]Center for Engineering Training and Basic Experimentation,Heilongjiang University of Science and Technology,Harbin 150022,China

出　　处：《Chinese Chemical Letters》2020年第4期1034-1038,共5页中国化学快报（英文版）

基　　金：partially supported by the National Natural Science Foundation of China(Nos.11504097,51772069);the Natural Science Foundation of Heilongjiang Province-China(No.QC2017003);the Scientific Research Foundation of Heilongjiang Province for Returned Chinese Scholars(Wu Lili)。

摘　　要：Ti3C2Tx has shown great potential in energy storage filed,but the restacking between Ti3C2Tx nanosheets seriously hampers the maximization of its capacitance.In this study,we rationally designed and synthesized porous Ti3C2Tx assemblies without any additive by introducing ice as spacers using a facile freeze-drying method.The porous Ti3C2Tx assemblies have a three-dimensional network structure,which consists of ultra large Ti3C2Tx lamellar walls and lots of macro-and mesopores.It has been proven that there are more-O groups on the surface of the porous Ti3C2Tx assemblies than the Ti3C2Tx film.The porous Ti3C2Tx assemblies deliver a maximum areal capacitance of 1668 mF/cm^2 when the mass loading is 8.4 mg/cm^2,an optimized specific capacitance of 247.2 F/g when the mass loading is 5.3 mg/cm^2,and87%capacitance retention over 10000 cycles.The symmetric solid-state supercapacitors based on the porous Ti3C2Tx assemblies show an areal capacitance of 355.8 mF/cm^2,the maximum power density of50 mW/cm^2 and an outstanding flexibility under different deformation.

关 键 词：MXenes Ti3C2Tx SUPERCAPACITOR FREEZE-DRYING Additive-free 

分 类 号：TM53[电气工程—电器]