Naslov
Reduction of graphene oxide by using phenolic compounds from olive leaf extract

Autori
Sačer, Denis ; Radić, Gabrijela ; Vrdoljak, Matea ; Stankir, Nataša ; Kraljić Roković, Marijana ;

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
6th RSE-SEE Conference Book of abstracts / Róbert Hohol - Budimpešta : International Society of Electrochemistry, 2017, 161-161

ISBN
978-615-5270-33-8

Skup
6th Regional Symposium on Electrochemistry of South- East Europe

Mjesto i datum
Mađarska, 11.07.2017. - 15.07.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Supercapacitors, graphene oxide, graphene, phenolic compounds

Sažetak
Since its discovery, graphene, the two- dimensional sheet of sp2 bonded carbon atoms has received significant attention. Based on its excellent electrical, mechanical and thermal properties with a wide range of potential applications there is constant need for its production in bulk quantities. Although developed methods [1, 2] which use standard strong reducing agents bring good results, there is constant need for less hazardous, less toxic and more economic chemicals. There are reports on green routes which use reducing agents such as green tea, ascorbic acid or vitamin C, baker's yeast or amino acids [3]. In this work simple and green chemistry route for the preparation of reduced graphene oxide (rGO) was studied. It was shown that graphene oxide (GO) can be successfully reduced by using phenolic compounds present in olive leaf extract (OLE). The phenolic compounds present in OLE are especially interesting because high amounts of water containing phenolic compounds are generated in olive oil production process. Therefore phenolic compounds could be used as cheap, easy available and green alternative for GO reduction. In this work graphene oxide reduction process was carried out by using two different methods. The first method was carried out in open air at temperature of 80˚C during five hours and it resulted in black dispersion of rGO. In the second procedure hydrothermal method was used at temperature of 120°C and increased pressure. As a result of increased pressure reduced graphene sheets were assemble into macroscopic aerogel which facilitated isolation of the product as well as its characterisation and electrochemical testing. The structural properties of the rGO samples were characterized by FT-IR spectroscopy and thermogravimetric analysis ( TGA ). Structural and morphological studies demonstrate that the part of the oxygen functionalities in GO can be removed effectively by using this process. Capacitive properties of the obtained rGO are determined by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy ( EIS ) techniques.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Temeljne tehničke znanosti

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