Treatment of Reticulated Vitreous Carbon by Dielectric Barrier Discharge Plasma for Electrodes Production

Autor(es)

Goncalves Da Silva, Leide Lili ; Ferreira, Luiz Gustavo ; Santos, Alberto Lima ; Botelho, Edson Cocchieri ; Toth, Andras ; Kostov, Konstantin G.

• Tipo de documento: Artigo Científico
• Fonte: IEEE TRANSACTIONS ON PLASMA SCIENCE; v. 41, n. 12, p. 7-pg., 2013-12-01.

Resumo

This paper deals with the surface modification of reticulated vitreous carbon (RVC) by dielectric barrier discharge (DBD) for electrodes production. RVC samples were exposed to air-DBD plasma for 5.0 and 10.0 min. Following the treatment, the specimens were characterized by scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), contact angle measurements, and electrochemical analyses [cyclic voltammetry (CV)]. The SEM images show an alteration of the RVC surface morphology because of the surface etching during the DBD processing. This finding is in agreement with the enhanced specific electrochemical surface area of RVC electrodes, which is related to an increase of its surface roughness. In addition, a slight increase of the oxygen content on the surface was confirmed by XPS analysis. Therefore, the RVC surface became more hydrophilic as detected by water contact angle measurements. For corroborating this statement, a solid monolithic vitreous carbon was used for this test. An increase in the anodic charge of the RVC electrodes due to the surface oxidation was also observed. Raman spectra showed insignificant changes in the material crystalline structure. (AU)

• Processo FAPESP: 10/03148-0 - Estudo da superfície do carbono vítreo reticulado após tratamento a plasma por descarga de barreira dielétrica (DBD) para a obtenção de eletrodos
• Beneficiário: Luiz Gustavo Ferreira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 07/03714-3 - Tratamento interfacial de compósitos termoplásticos e de carbono vítreo através de técnicas assistidas por plasma para aplicações aeroespacial, eletroquímica e biomédica
• Beneficiário: Leide Lili Gonçalves da Silva Kostov
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores