Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its Reduction

When graphene oxide is reduced, the functional groups are released and the structure becomes more ordered. The degree of reduction might be tunable with the process parameters. In our work, graphene oxide is prepared and the effect of thermal and chemical reduction is investigated. The samples are c...

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Main Authors:	László Péter Bakos, Lőrinc Sárvári, Krisztina László, János Mizsei, Zoltán Kónya, Gyula Halasi, Klára Hernádi, Anna Szabó, Dániel Berkesi, István Bakos, Imre Miklós Szilágyi
Format:	Article
Language:	English
Published:	MDPI AG 2020-11-01
Series:	Nanomaterials
Subjects:	graphene oxide reduced graphene oxide photocatalysis electrical resistance cyclic voltammetry
Online Access:	https://www.mdpi.com/2079-4991/10/11/2313

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spelling	doaj-d25e0d7ccc904570932acf450b184afa2020-11-25T04:12:29ZengMDPI AGNanomaterials2079-49912020-11-01102313231310.3390/nano10112313Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its ReductionLászló Péter Bakos0Lőrinc Sárvári1Krisztina László2János Mizsei3Zoltán Kónya4Gyula Halasi5Klára Hernádi6Anna Szabó7Dániel Berkesi8István Bakos9Imre Miklós Szilágyi10Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, HungaryDepartment of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, HungaryDepartment of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, Budafoki út 8. F. I. building, H–1111 Budapest, HungaryDepartment of Electron Devices, Budapest University of Technology and Economics, H-1117 Budapest, HungaryDepartment of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, HungaryDepartment of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, HungaryDepartment of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, HungaryDepartment of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, HungaryDepartment of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, HungaryInstitute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, HungaryDepartment of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, HungaryWhen graphene oxide is reduced, the functional groups are released and the structure becomes more ordered. The degree of reduction might be tunable with the process parameters. In our work, graphene oxide is prepared and the effect of thermal and chemical reduction is investigated. The samples are characterized with TG/DTA-MS, SEM-EDX, TEM, XPS, ATR-FTIR, Raman spectroscopy and XRD. Their electrical resistance, cyclic voltammetry and photocatalytic activity data are investigated. The conductivity can be varied by several orders of magnitude, offering a tool to match its electrical properties to certain applications. Low temperature reduction in air offers a material with the highest capacitance, which might be used in supercapacitors. The bare graphene oxide has considerably larger photocatalytic activity than P25 TiO<sub>2</sub>. Reduction decreases the activity, meaning that reduced graphene oxide can be used as an electron sink in composite photocatalysts, but does not contribute to the photocatalytic activity by itself.https://www.mdpi.com/2079-4991/10/11/2313graphene oxidereduced graphene oxidephotocatalysiselectrical resistancecyclic voltammetry
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	László Péter Bakos Lőrinc Sárvári Krisztina László János Mizsei Zoltán Kónya Gyula Halasi Klára Hernádi Anna Szabó Dániel Berkesi István Bakos Imre Miklós Szilágyi
spellingShingle	László Péter Bakos Lőrinc Sárvári Krisztina László János Mizsei Zoltán Kónya Gyula Halasi Klára Hernádi Anna Szabó Dániel Berkesi István Bakos Imre Miklós Szilágyi Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its Reduction Nanomaterials graphene oxide reduced graphene oxide photocatalysis electrical resistance cyclic voltammetry
author_facet	László Péter Bakos Lőrinc Sárvári Krisztina László János Mizsei Zoltán Kónya Gyula Halasi Klára Hernádi Anna Szabó Dániel Berkesi István Bakos Imre Miklós Szilágyi
author_sort	László Péter Bakos
title	Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its Reduction
title_short	Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its Reduction
title_full	Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its Reduction
title_fullStr	Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its Reduction
title_full_unstemmed	Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its Reduction
title_sort	electric and photocatalytic properties of graphene oxide depending on the degree of its reduction
publisher	MDPI AG
series	Nanomaterials
issn	2079-4991
publishDate	2020-11-01
description	When graphene oxide is reduced, the functional groups are released and the structure becomes more ordered. The degree of reduction might be tunable with the process parameters. In our work, graphene oxide is prepared and the effect of thermal and chemical reduction is investigated. The samples are characterized with TG/DTA-MS, SEM-EDX, TEM, XPS, ATR-FTIR, Raman spectroscopy and XRD. Their electrical resistance, cyclic voltammetry and photocatalytic activity data are investigated. The conductivity can be varied by several orders of magnitude, offering a tool to match its electrical properties to certain applications. Low temperature reduction in air offers a material with the highest capacitance, which might be used in supercapacitors. The bare graphene oxide has considerably larger photocatalytic activity than P25 TiO<sub>2</sub>. Reduction decreases the activity, meaning that reduced graphene oxide can be used as an electron sink in composite photocatalysts, but does not contribute to the photocatalytic activity by itself.
topic	graphene oxide reduced graphene oxide photocatalysis electrical resistance cyclic voltammetry
url	https://www.mdpi.com/2079-4991/10/11/2313
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Electric and Photocatalytic Properties of Graphene Oxide Depending on the Degree of Its Reduction

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