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Chen J.,Nanjing University of Posts and Telecommunications | Song J.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials | Feng X.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials
Polymer Bulletin | Year: 2016

The graphene/polyaniline (PANI) composite hydrogel was successfully prepared by a one-step hydrothermal method. The morphology and structure of the sample were characterized by digital camera, scanning electron microscopy, and Fourier transform infrared spectroscopy spectra. By combining the advantages of high conductivity of graphene and high pseudocapacitance of PANI, the composite hydrogel was taken as supercapacitor electrode material. Cyclic voltammetry and galvanostatic charge/discharge experimental results show that the composite has excellent electrochemical performance. The specific capacitance value is 258.5 F g−1 at a scan rate of 2 mV s−1 and the specific capacitance value is up to 307 F g−1 at a current density of 0.2 A g−1. The specific capacitance value can still maintain 90 % of the initial value after repeating the galvanostatic charge–discharge for 1000 cycles at a current density of 1.0 A g−1 showing good cycle stability. © 2016 Springer-Verlag Berlin Heidelberg Source


Chen Y.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials | Lei Z.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials | Zhang X.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials | Chu S.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials | And 8 more authors.
Journal of Luminescence | Year: 2016

Highly efficient blue organic light-emitting devices using an alcohol-soluble conjugated starburst macromolecule TrOH as electron injection layer were investigated. Multilayered OLEDs based on a blue polymer poly(9,9-dioctylfluorene) (PFO) and a blue small molecule 1,6-bis(3′,6′-bis(octyloxy)spiro [fluorene-9,9′- xanthene]-2-yl)pyrene (DOSFXPy) were fabricated by solution-processing. The devices exhibit low turn-on voltages of 3.8 V (PFO) and 3.5 V (DOSFXPy), and high current efficiencies of 4.3 cd/A (PFO) and 3.1 cd/A (DOSFXPy), respectively, which are better than those of the devices using TPBi/LiF as electron injection layer. These improved properties are attributed to the reduced barrier for electron injection by inserting a TrOH electron injection layer. © 2015 Elsevier B.V. All rights reserved. Source


Feng X.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials | Chen N.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials | Zhou J.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials | Li Y.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials | And 5 more authors.
New Journal of Chemistry | Year: 2015

Graphene-polyaniline (PANI) nanocomposites with different morphologies were successfully fabricated by an effective one-step hydrothermal method. The morphologies of PANI could be controlled from nanowires to nanocones by adjusting the amount of aniline with the assistance of an ultrasonication process. By taking the advantages of the high conductivity of graphene and the pseudocapacitance of PANI, graphene-PANI composites were used as an example for the application to the supercapacitor electrode materials. The cyclic voltammograms (CV) and galvanostatic charge-discharge measurements demonstrate that the graphene-PANI shows excellent electrochemical properties. The graphene-PANI nanowire composite (724.6 F g-1) exhibited higher specific capacitance than that of the graphene-PANI nanocone composite (602.5 F g-1) at a current density of 1.0 A g-1. Furthermore, the graphene-PANI nanowire composite exhibited outstanding capacitive performance with a high specific capacitance of 957.1 F g-1 at 2 mV s-1 and a high cycle reversibility of 90% after charge-discharge 1000 cycles. The improved electrochemical properties of the graphene-PANI nanocomposites suggest their promising applications to high-performance supercapacitors. This journal is © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2015. Source

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