Self-discharge of supercapacitors based on carbon nanotubes with different diameters

被引:56
作者
Zhang, Wei [1 ,2 ]
Yang, Wei [2 ]
Zhou, Huanhuan [2 ]
Zhang, Zailei [2 ]
Zhao, Man [2 ]
Liu, Qing [1 ]
Yang, Jing [1 ]
Lu, Xianmao [2 ,3 ,4 ]
机构
[1] Shandong Univ Sci & Technol, Coll Chem & Biol Engn, Qingdao 266590, Shandong, Peoples R China
[2] Chinese Acad Sci, Beijing Inst Nanoenergy & Nanosyst, Beijing 100083, Peoples R China
[3] Univ Chinese Acad Sci, Sch Nanosci & Technol, Beijing 100049, Peoples R China
[4] Guangxi Univ, Ctr Nanoenergy Res, Sch Phys Sci & Technol, Nanning 530004, Guangxi, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Self-discharge; Carbon nanotubes; Supercapacitors; Pore sizes; ELECTROCHEMICAL CAPACITORS; CHARGE REDISTRIBUTION; LAYER; ELECTRODES; GRAPHENE; SUPPRESSION; COMPOSITE; OXIDATION; FILMS; OXIDE;
D O I
10.1016/j.electacta.2020.136855
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The self-discharge of supercapacitors was investigated using electrodes composed of multiwalled carbon nanotubes (MWCNTs) of three different diameters: 20, 30, and 50 nm, respectively. A combined self-discharge mechanism including both ohmic leakage and diffusion-controlled faradaic reaction was employed to fit the open circuit voltage (OCV) decays of the supercapacitors. The existence of both large inter-bundle pores and small intra-bundle pores in the MWCNT electrodes led to a two-stage diffusion-controlled faradaic reaction process - while the first stage can be described as a divided diffusion-controlled (DDC) process due to the diffusion of ions from both inter- and intra-bundle pores, and the second stage corresponds to a single diffusion-controlled (SDC) process mainly due to the diffusion of ions from the intra-bundle pores. The diffusion parameters obtained based on this model were consistent with the measured self-discharge rates which increased with the size of the MWCNTs. The results of this work demonstrate that electrode materials with wide pore size distributions may be associated with more complex self-discharge processes. (C) 2020 Elsevier Ltd. All rights reserved.
引用
收藏
页数:7
相关论文
共 70 条
[1]  
An KH, 2001, ADV FUNCT MATER, V11, P387, DOI 10.1002/1616-3028(200110)11:5<387::AID-ADFM387>3.0.CO
[2]  
2-G
[3]  
An KH, 2001, ADV MATER, V13, P497, DOI 10.1002/1521-4095(200104)13:7<497::AID-ADMA497>3.0.CO
[4]  
2-H
[5]   Self-Discharge in Electrochemical Capacitors: A Perspective Article [J].
Andreas, Heather A. .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2015, 162 (05) :A5047-A5053
[6]   INTERCALATION AND SORPTION BY MONTMORILLONITE [J].
BARRER, RM ;
MACLEOD, DM .
TRANSACTIONS OF THE FARADAY SOCIETY, 1954, 50 (09) :980-989
[7]   Energy storage and its use with intermittent renewable energy [J].
Barton, JP ;
Infield, DG .
IEEE TRANSACTIONS ON ENERGY CONVERSION, 2004, 19 (02) :441-448
[8]   Prediction of the self-discharge profile of an electrochemical capacitor electrode in the presence of both activation-controlled discharge and charge redistribution [J].
Black, Jennifer ;
Andreas, Heather A. .
JOURNAL OF POWER SOURCES, 2010, 195 (03) :929-935
[9]   Effects of charge redistribution on self-discharge of electrochemical capacitors [J].
Black, Jennifer ;
Andreas, Heather A. .
ELECTROCHIMICA ACTA, 2009, 54 (13) :3568-3574
[10]   Pore Shape Affects Spontaneous Charge Redistribution in Small Pores [J].
Black, Jennifer M. ;
Andreas, Heather A. .
JOURNAL OF PHYSICAL CHEMISTRY C, 2010, 114 (27) :12030-12038