Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6581500 | Chemical Engineering Journal | 2016 | 10 Pages |
Abstract
In this paper, a new class of sandwich-like ternary hierarchical nanosheets is fabricated by a facile, reproducible, and scalable two-step strategy. Conducting polymer polyaniline (PANI) is coated on reduced graphene oxide (RGO) to form PANI/RGO hybrid nanosheets. Then, nanoflaky manganese dioxide (MnO2) in situ grows on PANI/RGO hybrid nanosheets to obtain ternary hierarchical nanosheets MnO2/PANI/RGO by simply mixing PANI/RGO and KMnO4 under mild condition. The electrochemical behavior shows that MnO2/PANI/RGO electrode material is a typical pseudo-capacitance. In comparison with RGO, PANI, and PANI/RGO hybrid nanosheets, MnO2/PANI/RGO composites display the highest specific capacitance of 1090.2Â FÂ gâ1 at 0.5Â AÂ gâ1 in three-electrode configuration. They maintain 82.3% initial capacitance after 5000 consecutive cycles at 0.5Â AÂ gâ1. The excellent electrochemical performance is attributed to nanometer-sized flaky MnO2in situ growth on the surface of PANI/RGO, which can enhance electrode/electrolyte interface areas, provide high electroactive regions and short diffusion lengths, and protect the structure of composites effectively. Thus, the sandwich-like ternary hierarchical nanosheets of MnO2/PANI/RGO are excellent electrode material in supercapacitor with high specific capacitance and the long-term cycle stability, which is helpful in developing new kinds of portable energy storage devices.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Qianhui Wu, Ming Chen, Shishuang Wang, Xiue Zhang, Long Huan, Guowang Diao,