Hierarchical TiO2 nanobelts@MnO2 ultrathin nanoflakes core-shell array electrode materials for supercapacitors

被引:100
作者
Luo, Yongsong [1 ,2 ]
Kong, Dezhi [1 ,2 ]
Luo, Jingshan [1 ]
Chen, Shi [1 ]
Zhang, Deyang [2 ]
Qiu, Kangwen [2 ]
Qi, Xiaoying [3 ]
Zhang, Hua [3 ]
Li, Chang Ming [4 ]
Yu, Ting [1 ,5 ,6 ]
机构
[1] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore
[2] Xinyang Normal Univ, Dept Phys & Elect Engn, Xinyang 464000, Peoples R China
[3] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore
[4] Southwest Univ, Inst Clean Energy & Adv Mat, Chongqing 400700, Peoples R China
[5] Nanyang Technol Univ ERIAN, Energy Res Inst, Singapore 639789, Singapore
[6] Natl Univ Singapore, Dept Phys, Fac Sci, Singapore 117542, Singapore
来源
RSC ADVANCES | 2013年 / 3卷 / 34期
基金
新加坡国家研究基金会;
关键词
HIGH-PERFORMANCE; HYDROTHERMAL SYNTHESIS; CORE/SHELL ARRAYS; OXIDE NANOWIRES; ANATASE; MNO2; COMPOSITE; TEXTILES; DESIGN; RUO2;
D O I
10.1039/c3ra42229a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Hierarchical TiO2 nanobelts@MnO2 ultrathin nanoflakes core-shell arrays (TiO2@MnO2 NBAs) have been fabricated on a Ti foil substrate by hydrothermal approach and further investigated as the electrode for a supercapacitor. Their electrochemical properties were examined using cyclic voltammetry (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS) in a three-electrode cell. The experimental observations clearly show that the fabricated TiO2@MnO2 NBAs electrode possesses superior rate capability and outstanding cycling performance due to its rationally designed nanostructure. A specific capacitance as high as 557.6 F g(-1) is obtained at a scan rate of 200 mV s(-1) (454.2 F g(-1) at a current density of 200 mA g(-1)) in 1 M Na2SO4 aqueous solution. The energy density and power density measured at 2 A g(-1) are 7.5 Wh kg(-1) and 1 kW kg(-1) respectively, demonstrating its good rate capability. In addition, the composite TiO2@MnO2 NBAs electrode shows excellent long-term cyclic stability. The fabrication method presented here is facile, cost-effective and scalable, which may open a new pathway for real device applications.
引用
收藏
页码:14413 / 14422
页数:10
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