Naslov
Energetically efficient and electrochemically tuneable exfoliation of graphite: process monitoring and product characterization

Autori
Ljubek, Gabrijela ; Čapeta, Davor ; Šrut Rakić, Iva ; Kraljić Roković, Marijana

Izvornik
Journal of materials science (0022-2461) 56 (2021), 18; 10859-10875

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
graphene ; graphene oxide ; anodic polarization ; cathodic polarization ; surfactant solution ; energy consumption

Sažetak
In this work, graphene oxide was prepared by electrochemical exfoliation of graphite in sodium dodecylsulfate and sodiumdodecylbenzene sulfonate aqueous solution. Two different working electrodes were used: an electrode prepared from natural graphite flakes and a commercial natural graphite rod. The electrodes were polarized in a two electrode system by a multistep change of polarity or by single anodic and cathodic polarization. The voltage value ranged from 2.5 V to 3.2 V. By monitoring the current transients and the colour of the resultant solutions, it was shown that the exfoliation process depends on the type of working electrode, surfactants and applied voltage value. The multistep change of polarity was more effective compared to single polarization. The ultraviolet-visible spectrophotometry and Raman spectroscopy indicated the presence of defects within the graphene structure while FTIR spectroscopy indicated presence of oxygen functional groups, which is characteristic of graphene oxide (GO). Dynamic light scattering revealed that the solutions obtained in this work contained GO sheets within the size of 10-600 nm. Atomic force microscopy measurements proved that the obtained product contains multi-layer sheets. The energy consumption for the process carried out in this work ranges from 0.084 kWh g-1 to 0.038 kWh g-1 and therefore this process is considered to be a low energy and cost- effective process.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo, Temeljne tehničke znanosti, Interdisciplinarne tehničke znanosti

Napomena
Glavni autor: Gabrijela Ljubek, Marijana Kraljić Roković

POVEZANOST RADA