MnO sub(2)/onion-like carbon nanocomposites for pseudocapacitors

Manganese oxide (MnO sub(2))/onion-like carbon (OLC) nanocomposites have been synthesized by a hydrothermal method for application as the electrode material of pseudocapacitors. An asymmetric pseudocapacitor was composed of MnO sub(2)/OLC nanocomposites as the working electrode and nickel foam as th...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials chemistry 2012-08, Vol.22 (34), p.17584-17588
Main Authors: Wang, Ye, Yu, Siu Fung, Sun, Cheng Yue, Zhu, Tie Jun, Yang, Hui Ying
Format: Article
Language:English
Subjects:
Asymmetry
Capacitance
Carbon
Electrodes
Electrolytes
Foams
Manganese oxides
Nanocomposites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Manganese oxide (MnO sub(2))/onion-like carbon (OLC) nanocomposites have been synthesized by a hydrothermal method for application as the electrode material of pseudocapacitors. An asymmetric pseudocapacitor was composed of MnO sub(2)/OLC nanocomposites as the working electrode and nickel foam as the counter electrode immersed in an aqueous Na sub(2)SO sub(4) solution as the electrolyte is assembled. With the presence of OLC, the corresponding specific capacitance is improved from 27.5 to 177.5 F g super(-1) at 2 A g super(-1) current charge-discharge rate when compared to that of using pure MnO sub(2) as the working electrode. Furthermore, only 6.3% decrease of the specific capacitance is observed when the discharge rate is increased from 0.2 to 2 A g super(-1). Our MnO sub(2)/OLC pseudocapacitors also exhibit a superior cycling stability of 99-101% retention of specific capacitance after 1000 cycles. The results exhibit great potential in developing quick-charge/slow-discharge supercapacitors for practical applications.
ISSN:0959-9428
1364-5501
DOI:10.1039/c2jm33558a