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Materials 2016, 9(1), 31; doi:10.3390/ma9010031

Improved Electrochemical Detection of Zinc Ions Using Electrode Modified with Electrochemically Reduced Graphene Oxide

1
Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, Brno CZ-613 00, Czech Republic
2
Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, Brno CZ-616 00, Czech Republic
3
Global Change Research Institute, The Czech Academy of Sciences, v.v.i., Bělidla 4a, Brno CZ-603 00, Czech Republic
4
Department of Biomedical and Environmental Analysis, Wroclaw Medical University, Borowska 211, Wrocław PL-50 556, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Jung Ho Je
Received: 11 November 2015 / Revised: 22 December 2015 / Accepted: 4 January 2016 / Published: 7 January 2016
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [1832 KB, uploaded 7 January 2016]   |  

Abstract

Increasing urbanization and industrialization lead to the release of metals into the biosphere, which has become a serious issue for public health. In this paper, the direct electrochemical reduction of zinc ions is studied using electrochemically reduced graphene oxide (ERGO) modified glassy carbon electrode (GCE). The graphene oxide (GO) was fabricated using modified Hummers method and was electrochemically reduced on the surface of GCE by performing cyclic voltammograms from 0 to −1.5 V. The modification was optimized and properties of electrodes were determined using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The determination of Zn(II) was performed using differential pulse voltammetry technique, platinum wire as a counter electrode, and Ag/AgCl/3 M KCl reference electrode. Compared to the bare GCE the modified GCE/ERGO shows three times better electrocatalytic activity towards zinc ions, with an increase of reduction current along with a negative shift of reduction potential. Using GCE/ERGO detection limit 5 ng·mL−1 was obtained. View Full-Text
Keywords: carbon; cyclic voltammetry; electrochemical impedance spectroscopy; electrochemistry; graphene oxide; heavy metal detection; reduced graphene oxide carbon; cyclic voltammetry; electrochemical impedance spectroscopy; electrochemistry; graphene oxide; heavy metal detection; reduced graphene oxide
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kudr, J.; Richtera, L.; Nejdl, L.; Xhaxhiu, K.; Vitek, P.; Rutkay-Nedecky, B.; Hynek, D.; Kopel, P.; Adam, V.; Kizek, R. Improved Electrochemical Detection of Zinc Ions Using Electrode Modified with Electrochemically Reduced Graphene Oxide. Materials 2016, 9, 31.

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