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Issue 7, 2014
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An interleaved porous laminate composed of reduced graphene oxide sheets and carbon black spacers by in situ electrophoretic deposition

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Abstract

Although the graphene-based materials have a great potential to be used for various energy storage devices, the expected performance of graphene has not been achieved yet seemingly due to the lack of interconnected porosity and actively-exposed surface area that should be developed in the re-stacked graphene electrodes. Herein we used an electrophoretic deposition (EPD) method to fabricate a binder-free porous supercapacitor electrode composed of reduced graphene oxide (RGO) sheets and conductive carbon black (CB) particles. Applying EPD for an electrostatically-stabilized aqueous mixture of RGO and CB nanoparticles, the electrophoretic squeezing force in EPD induced the RGO sheets to align in the in-plane direction along with the CB particles placed in the interlayers of RGO. The developed ladder-like interleaved composite structure allowed a desirable porosity network and conductive path for a facile movement of ions and electrons. Controlling the ratios of concentrations (Cs,RGO/Cs,CB) and/or zeta potentials (ξRGO/ξCB) of the RGO and CB nanoparticles in aqueous mixtures, different nanostructures of the interleaved RGO/CB laminates could be fabricated. Thoroughly tested as a supercapacitor electrode in an organic electrolyte (TEA BF4), the developed RGO/CB electrodes provided excellent performance of the specific capacitance of 218 F g−1 at a scan rate of 1 mV s−1 (133.3 F g−1 at a current density of 2 A g−1), energy density of 43.6 W h kg−1 and power density of 71.3 kW kg−1. It is believed that an ideal performance of intrinsic graphene properties could be exerted by the unique nanostructure of binder-free interleaved graphene laminates as developed by the scalable in situ EPD process for large-volume production.

Graphical abstract: An interleaved porous laminate composed of reduced graphene oxide sheets and carbon black spacers by in situ electrophoretic deposition

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Publication details

The article was received on 21 Oct 2013, accepted on 29 Nov 2013 and first published on 02 Dec 2013


Article type: Paper
DOI: 10.1039/C3RA45979A
Citation: RSC Adv., 2014,4, 3284-3292
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    An interleaved porous laminate composed of reduced graphene oxide sheets and carbon black spacers by in situ electrophoretic deposition

    M. Wang, J. Oh, T. Ghosh, S. Hong, G. Nam, T. Hwang and J. Nam, RSC Adv., 2014, 4, 3284
    DOI: 10.1039/C3RA45979A

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