A hierarchical nanostructure consisting of amorphous MnO2, Mn3O4 nanocrystallites, and single-crystalline MnOOH nanowires for supercapacitors

被引:144
作者
Hu, Chi-Chang [1 ]
Hung, Ching-Yun [1 ]
Chang, Kuo-Hsin [1 ,2 ]
Yang, Yi-Lin [2 ]
机构
[1] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 30013, Taiwan
[2] Natl Chung Cheng Univ, Dept Chem Engn, Chiayi 621, Taiwan
关键词
Ternary nanocomposite; Manganese oxides; Cycle stability; Supercapacitor; CHARGE STORAGE MECHANISM; CAPACITIVE CHARACTERISTICS; ANODIC DEPOSITION; HIGH-POWER; BEHAVIOR; RUO2;
D O I
10.1016/j.jpowsour.2010.08.001
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this communication, a porous hierarchical nanostructure consisting of amorphous MnO2 (a-MnO2), Mn3O4 nanocrystals, and single-crystalline MnOOH nanowires is designed for the supercapacitor application, which is prepared by a simple two-step electrochemical deposition process. Because of the gradual co-transformation of Mn3O4 nanocrystals and a-MnO2 nanorods into an amorphous manganese oxide, the cycle stability of a-MnO2 is obviously enhanced by adding Mn3O4. This unique ternary oxide nanocomposite with 100-cycle CV activation exhibits excellent capacitive performances, i.e., excellent reversibility, high specific capacitances (470 Fg(-1) in CaCl2), high power property, and outstanding cycle stability. The highly porous microstructures of this composite before and after the 10,000-cycle CV test are examined by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:847 / 850
页数:4
相关论文
共 24 条
[21]   A Cost-Effective Supercapacitor Material of Ultrahigh Specific Capacitances: Spinel Nickel Cobaltite Aerogels from an Epoxide-Driven Sol-Gel Process [J].
Wei, Te-Yu ;
Chen, Chun-Hung ;
Chien, Hsing-Chi ;
Lu, Shih-Yuan ;
Hu, Chi-Chang .
ADVANCED MATERIALS, 2010, 22 (03) :347-+
[22]   Capacitive Behavior and Charge Storage Mechanism of Manganese Dioxide in Aqueous Solution Containing Bivalent Cations [J].
Xu, Chengjun ;
Du, Hongda ;
Li, Baohua ;
Kang, Feiyu ;
Zeng, Yuqun .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2009, 156 (01) :A73-A78
[23]   Growth of manganese oxide nanoflowers on vertically-aligned carbon nanotube arrays for high-rate electrochemical capacitive energy storage [J].
Zhang, Hao ;
Cao, Gaoping ;
Wang, Zhiyong ;
Yang, Yusheng ;
Shi, Zujin ;
Gu, Zhennan .
NANO LETTERS, 2008, 8 (09) :2664-2668
[24]   A self-ordered, crystalline-glass, mesoporous nanocomposite for use as a lithium-based storage device with both high power and high energy densities [J].
Zhou, HS ;
Li, DL ;
Hibino, M ;
Honma, I .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2005, 44 (05) :797-802