Graphene/polypyrrole intercalating nanocomposites as supercapacitors electrode
2013; Elsevier BV; Volume: 112; Linguagem: Inglês
10.1016/j.electacta.2013.08.149
ISSN1873-3859
AutoresYun Liu, Huanhuan Wang, Jie Zhou, Linyi Bian, Enwei Zhu, Jiefeng Hai, Jian Tang, Weihua Tang,
Tópico(s)Advancements in Battery Materials
ResumoHierarchical plush polypyrrole (PPy) layers intercalated graphene sheets have been prepared by in-situ intercalative chemical polymerization. The as-prepared graphene/PPy nanocomposites have been successfully characterized in terms of composition, morphology, and electrochemical properties. It was found that the chemically modified graphene nanosheets and in-situ polymerized PPy layers formed uniform nanocomposites with homogeneous PPy layers intercalated between the graphene substrates. Such uniform nanostructure together with the observed high conductivities (the highest 1980 S m−1) afforded the graphene/PPy composites with high specific capacitance and good cycling stability during the charge–discharge process when used as supercapacitor electrodes. The graphene/PPy (with optimized composition 10:1) based supercapacitors display intriguing performance with a maximum specific capacitance of 650 F g−1 at 0.45 A g−1 current density, a highest energy density of 54.0 W h kg−1 at 1 mA current, and a highest power density of 778.1 W kg−1 at 5 mA current. Furthermore, the graphene/PPy supercapacitor exhibits an excellent cycling stability with 95% specific capacitance retained after 5000 cycles. The impressive results presented here may open the window for grapheme/PPy composites for their promising applications in high energy density storage system.
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