Comparative study of different types of graphenes as electrocatalysts for ascorbic acid

被引：86

作者：

Stergiou, Dimitrios V. ^{[1
]}

Diamanti, Evmorfia K. ^{[2
]}

Gournis, Dimitrios ^{[2
]}

Prodromidis, Mamas I. ^{[1
]}

机构：

[1] Univ Ioannina, Dept Chem, GR-45110 Ioannina, Greece

[2] Univ Ioannina, Dept Mat Sci & Engn, GR-45110 Ioannina, Greece

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2010年 / 12卷 / 10期

关键词：

Graphene oxide; Chemically-reduced graphene oxide; Graphene; Ascorbic acid; Electrochemical sensors; OXIDE; LIQUID;

D O I：

10.1016/j.elecom.2010.07.006

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A comparative study regarding the electrocatalytic activity of graphene oxide (GO), chemically-reduced graphene oxide (crGO) and graphene produced by direct liquid exfoliation (dG) is presented. Sensors were developed by modifying glassy carbon (GC) electrodes with GO, crGO and dG and ascorbic acid was used as a pilot analyte. GC/GO electrodes offer substantially lower oxidation overpotential, up to 350 mV, compared with GC/crGO, GC/dG and unmodified GC electrodes. In addition, the different carbon-to-oxygen atomic ratios in GO, as it occurs depending on the synthetic route, were found to have a remarkable effect on the performance of the sensors. Reduction of GO was achieved by immersing the modified electrodes into a stirred solution of NaBH4 for 10 min at room temperature. This process was used alternatively of the time consuming and laborious process of hydrazine, and its effectiveness was confirmed by cyclic voltammetry and electrochemical impedance spectroscopy. Analytical utility of the sensors is demonstrated. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1307 / 1309

页数：3

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