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Graphene electrochemistry in ionic liquids

Grant number: 11/16078-3
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2012
Effective date (End): February 28, 2014
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Roberto Manuel Torresi
Grantee:Lucas Lodovico de Carvalho
Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:09/53199-3 - Molecular recognition and energy storage: fundamental studies concerning geometry, size and synthesis effects on the optimization of the chemical properties of electroactive materials, AP.TEM


Searching power storage devices more efficient, much focus has been given to new materials, which have physical and chemical characteristics that make them promising materials able to overcome materials currently in use, as well as devices based on them. In this sense, two materials should be highlighted in the area of electrochemical devices, whether they are ionic liquids and graphene. Ionic liquids are salts with melting temperature less than 100oC, which can be used as electrolytes in electrochemical applications due to its intrinsic conductivity, high thermal and electrochemical stability and low vapor pressure, for these reasons there are promising materials as electrolytes for ion-lithium batteries, the liquid phase to obtaining metallic deposit with lower reduction potential of the water, and even in other areas than electrochemical. Recently, another application that deserves mention is the manufacture of electrochemical double layer capacitors, or supercapacitors, which are based on the storage of charge, and therefore energy in an electrochemical double layer of a polarized electrode. The ionic liquids used as electrolyte, able, in theory, increase the energy of such devices when compared to aqueous or organic electrolytes. In order to maximize the area of the electroactive device, materials with high specific area (area per mass of material) is desirable, since it contributes to a high energy and specific power of the final device. Among these materials, one can cite electroactive carbon, carbon nanotubes and, more recently, graphene. Graphene, with its specific area of ~ 2600 m² g-1 is a very promising material for the construction of electrodes for these applications. In this work, we intend to build devices using graphene supercapacitors as electroactive material, investigating the possible effects of chemical structure and mode of immobilization on device performance and enhance the interaction between electrode and electrolyte, either by improving the graphene and the ionic liquid used.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TORRESI, ROBERTO M.; LODOVICO, LUCAS; BENEDETTI, TANIA M.; ALCANTARA, MARIA R.; DEBIEMME-CHOUVY, CATHERINE; DESLOUIS, CLAUDE. Convective mass transport in ionic liquids studied by electrochemical and electrohydrodynamic impedance spectroscopy. Electrochimica Acta, v. 93, p. 32-43, . (09/53199-3, 12/02117-0, 11/16078-3)
LODOVICO, LUCAS; MARTINS, VITOR L.; BENEDETTI, TANIA M.; TORRESI, ROBERTO M.. Electrochemical behavior of iron and magnesium in ionic liquids. Journal of the Brazilian Chemical Society, v. 25, n. 3, p. 460-U236, . (09/53199-3, 12/02117-0, 09/09209-4, 11/16078-3)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
CARVALHO, Lucas Lodovico de. Construction and electrochemical characterization of grapheme-based electrodes. 2014. Master's Dissertation - Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) São Paulo.

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