English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/181793
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


An aqueous cathodic delamination route towards high quality graphene flakes for oil sorption and electrochemical charge storage applications

AuthorsGarcía Dalí, Sergio; Paredes Nachón, Juan Ignacio ; Munuera Fernández, José María ; Villar Rodil, Silvia ; Martínez Alonso, Amelia ; Díez Tascón, Juan Manuel
KeywordsTwo-dimensional (2D) material
Cobalt oxide
Electrochemical exfoliation
Water remediation
Energy storage
Issue Date29-Apr-2019
CitationChemical Engineering Journal 372: 1226-1239 (2019)
AbstractThe electrochemical exfoliation of graphite in aqueous medium stands out as an attractive, scalable approach for the production of graphenes for different applications, due to its simplicity, cost-effectiveness and environmental friendliness. In particular, cathodic exfoliation in water should allow access to high quality, non-oxidized graphene flakes, as it avoids the intrinsic oxidizing conditions that typically plague the anodic route, but this possibility has been limited by a poor intercalation ability of aqueous cations. Here, we demonstrate that with a proper choice of starting graphite and electrolyte, high quality graphene flakes can be obtained in substantial yields via cathodic delamination in water. Graphites having some pre-expanded edges and interlayer voids (e.g., graphite foil) were found to be critical for a successful exfoliation. Large differences in the efficiency of a range of aqueous quaternary ammonium-based electrolytes were observed, quantitatively compared and rationalized on the basis of their chemical structure. Graphene yields up to 40–50 wt% were attained with the most efficient cations (tetrapropylammonium and hexyltrimethylammonium). Hydrophobic sponges made up of cathodic graphene-coated melamine foam exhibited a notable capacity towards the sorption of oils and organic solvents from water with good re-usability. Hybrids comprised of cathodically exfoliated graphite and a small amount of vertically oriented cobalt oxide nanosheets displayed good electrochemical charge storage behavior. Overall, the ability to access graphene flakes in considerable yields by the aqueous cathodic route disclosed here should raise the prospects of cathodic exfoliation as a competitive method for the industrial manufacturing of high quality graphene for practical applications.
Publisher version (URL)https://doi.org/10.1016/j.cej.2019.04.201
Appears in Collections:(INCAR) Artículos
Files in This Item:
File Description SizeFormat 
Aqueous_cathodic_delamination_Dalí.pdf Embargoed until April 30, 2021914,71 kBAdobe PDFThumbnail
View/Open    Request a copy
Aqueous_cathodic_delamination_Dalí_SI.pdf Embargoed until April 30, 2021Supplementary Information515,1 kBAdobe PDFThumbnail
View/Open    Request a copy
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.