Issue 20, 2015

Sprayable, paintable layer-by-layer polyaniline nanofiber/graphene electrodes

Abstract

Using polyaniline nanofibers and graphene oxide sheets, we demonstrate here the successful layer-by-layer (LbL) assembly of the two anisotropic nanomaterials using a water-based spray-on approach. The processing parameters most critical to the production of uniform electrodes are blow-drying time and removal of the rinsing step. The resulting polyaniline nanofiber/graphene oxide films are electrochemically reduced to convert graphene oxide to reduced graphene oxide, as evidenced by a distinctive change in colour and Raman spectra. The architecture of the electrode is highly porous (74% void), which facilitates ion transport. The electrodes' ability to store charge is evaluated as a function of thickness in non-aqueous conditions (LiClO4 in propylene carbonate, lithium metal anode). The capacity reaches values as high as 114 mA h g−1 (45 mA h cm−3) at 0.03 A g−1. Besides capacity, other performance metrics (energy and power) are compared against control electrodes made by a different processing approach, dip-assisted LbL assembly. It is found that spray-assisted LbL assembly is over 70 times faster and yields electrodes with better rate capability relative to dip-assisted LbL assembly.

Graphical abstract: Sprayable, paintable layer-by-layer polyaniline nanofiber/graphene electrodes

Supplementary files

Article information

Article type
Paper
Submitted
22 déc. 2014
Accepted
22 janv. 2015
First published
22 janv. 2015

RSC Adv., 2015,5, 14994-15001

Author version available

Sprayable, paintable layer-by-layer polyaniline nanofiber/graphene electrodes

S. R. Kwon, J. Jeon and J. L. Lutkenhaus, RSC Adv., 2015, 5, 14994 DOI: 10.1039/C4RA16822D

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