The synthesis of shape-controlled MnO2/graphene composites via a facile one-step hydrothermal method and their application in supercapacitors

被引:145
作者
Feng, Xiaomiao [1 ]
Yan, Zhenzhen [1 ]
Chen, Ningna [1 ]
Zhang, Yu [1 ]
Ma, Yanwen [1 ]
Liu, Xingfen [1 ]
Fan, Quli [1 ]
Wang, Lianhui [1 ]
Huang, Wei [1 ]
机构
[1] Nanjing Univ Posts & Telecommun, Key Lab Organ Elect & Informat Displays, Inst Adv Mat, Sch Mat Sci & Engn, Nanjing 210046, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
MANGANESE-DIOXIDE; ELECTROCHEMICAL CAPACITORS; HIGH-PERFORMANCE; GRAPHENE SHEETS; HYBRID NANOSTRUCTURES; ELECTRODES; CARBON; BATTERIES; OXIDE; MECHANISMS;
D O I
10.1039/c3ta12780j
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
Novel MnO2 petal nanosheet and nanorod/graphene composites are successfully fabricated by a facile one-step hydrothermal method through changing the content of the Mn source. The formation mechanism of different morphologies of MnO2/graphene composites have been studied. The structure of the MnO2/graphene is "sandwich"-like, with MnO2 petal nanosheets and nanorods homogeneously anchored on each side of the graphene. Furthermore, the MnO2/graphene composites with different shapes can be used for supercapacitor electrode materials. The experimental results show that the MnO2 petal nanosheet/graphene composite has better capacitance performance than that of the MnO2 nanorod/graphene composite. The MnO2 petal nanosheet/graphene composite shows excellent specific capacitance as high as 516.8 F g(-1) at a scan rate of 1 mV s(-1) in 1 M Na2SO4 electrolyte and good long-term cycle stability, indicating its potential application to act as a promising electrode material for high-performance supercapacitors. This study provides a facile and in situ method to prepare metal oxide/graphene composite materials and a novel scaffold to construct other metal oxides with graphene for energy storage.
引用
收藏
页码:12818 / 12825
页数:8
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