☆ 4.6 Article

Persistent electrochemical pillaring of graphene ensembles

ELECTROCHEMISTRY COMMUNICATIONS (2013)

Journal

ELECTROCHEMISTRY COMMUNICATIONS

Volume 34, Issue -, Pages 189-191

Publisher

ELSEVIER SCIENCE INC

DOI: 10.1016/j.elecom.2013.06.007

Keywords

Pillaring; Staging; Graphene; Graphite oxide; Supercapacitors

Categories

Electrochemistry

Funding

Swiss National Science Foundation (SNSF) [200021_126855/1]
Swiss National Science Foundation (SNF) [200021_126855] Funding Source: Swiss National Science Foundation (SNF)

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Abstract

The electrochemical activation of partially reduced graphite oxide (GOpr) with a layer spacing of 4.4 angstrom was monitored by in situ XRD. After anodic activation in 1 M TEABF(4) in acetonitrile (AN) the interlayer spacing of the graphene planes was increased from 4.4 angstrom to about 13 angstrom as indicated by a new (001) peak in the XRD pattern at about 2 theta = 3 degrees. During subsequent charge discharge cycles this peak is stable and demonstrates the existence of stable pillars between the graphene layers, resulting in slit-like pores of about 1 nm between the graphene layers. While the respective expansion of the activated GOpr moieties is in the order of 300%, dilatometry measurements of the electrode indicate an expansion of 40% only. After activation a stable capacitance of up to 220 F/g is achieved for the activated GOpr. (C) 2013 Elsevier B.V. All rights reserved.

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