Journal
ELECTROCHIMICA ACTA
Volume 289, Issue -, Pages 238-247Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.09.040
Keywords
Graphene oxide; Polypyrrole; Redox-active; Supercapacitor
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Funding
- National Natural Science Foundation of China [51603116]
- Zhejiang National Nature Science Foundation [LQ16B010002]
- SDUST Research Fund [2014TDJH104]
- China Scholarship Council (CSC)
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Reduced graphene oxide (RGO)/polypyrrole (PPy) nanocomposites (GPs) with urchin-like and well-defined doping structure are synthesized by a very facile one-step method. The redox-active 1,4-benzoquinone, embedded in graphene oxide (GO) sheets, can be in situ served as both oxidant of PPy and its reduced state-hydroquinone used as the reductant of GO. One-dimensional nanowire-like PPys assembling on the two-dimensional RGO sheets formed three-dimensional urchin-like porous microstructure. The doping structure of the GPs can also be confirmed by N1s of X-ray photoelectron spectrometer results. As a result, the GPs provided dramatically improved specific capacitances as well as wider potential window compared with pristine GO and PPy. GP3 (the weight percentage of GO is 30 wt %) and GP5 (the weight percentage of GO is 50 wt%) supercapacitor devices also demonstrated high energy density as well as good cycling stability. (C) 2018 Elsevier Ltd. All rights reserved.
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