Facile synthesis of sandwich-like polyaniline/boron-doped graphene nano hybrid for supercapacitors

The physicochemical property of chemically prepared graphene can be significantly changed due to the incorporating of heteroatoms into graphene. In this article, boron-doped graphene sheets are used as carbon substrates instead of graphene for loading polyaniline by in situ polymerization. Compared...

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Bibliographic Details
Published in:Carbon (New York) 2015-01, Vol.81, p.552-563
Main Authors: Hao, Qingli, Xia, Xifeng, Lei, Wu, Wang, Wenjuan, Qiu, Jieshan
Format: Article
Language:English
Subjects:
Applied sciences
Capacitance
Capacitors
Carbon
Conduction
Cross-disciplinary physics: materials science
rheology
Electrical, magnetic and optical properties
Electrolytes
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Graphene
Materials science
Organic polymers
Physicochemistry of polymers
Physics
Polyanilines
Properties and characterization
Specific materials
Supercapacitors
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Summary:The physicochemical property of chemically prepared graphene can be significantly changed due to the incorporating of heteroatoms into graphene. In this article, boron-doped graphene sheets are used as carbon substrates instead of graphene for loading polyaniline by in situ polymerization. Compared with the individual component and polyaniline/non-doped graphene, the sandwich-like polyaniline/boron-doped graphene exhibits remarkably enhanced electrochemical specific capacitance in both acid and alkaline electrolytes. In a three-electrode configuration, the hybrid has a specific capacitance about 406Fg−1 in 1M H2SO4 and 318Fg−1 in 6M KOH at 1mVs−1. In the two-electrode system of a symmetric supercapacitor, this hybrid achieves a specific capacitance about 241 and 189Fg−1 at 0.5Ag−1 with a specific energy density around 19.9 and 30.1Whkg−1, in the acid and alkaline electrolytes, respectively. The as-obtained polyaniline/boron-doped graphene hybrid shows good rate performance. Notably, the obtained electrode materials exhibit long cycle stability in both acid and alkaline electrolytes (∼100% and 83% after 5000 cycles, respectively). The improved electrochemical performance of the hybrid is mainly attributed to the introduction of additional p-type carriers in carbon systems by boron-doping and the well combination of pseudocapacitive conducting polyaniline.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2014.09.090