Electrochemically reduced graphene oxide with enhanced electrocatalytic activity toward tetracycline detection

doi:10.1016/S1872-2067(15)60956-1

Abstract

Abstract:

An electrochemically reduced graphene oxide sample, ERGO_-0.8V, was prepared by electrochemical reduction of graphene oxide (GO) at -0.8 V, which shows unique electrocatalytic activity toward tetracycline (TTC) detection compared to the ERGO_-1.2V (GO applied to a negative potential of -1.2 V), GO, chemically reduced GO (CRGO)-modified glassy carbon electrode (GC) and bare GC electrodes. The redox peaks of TTC on an ERGO_-0.8V-modified glass carbon electrode (GC/ERGO_-0.8V) were within 0-0.5 V in a pH 3.0 buffer solution with the oxidation peak current correlating well with TTC concentration over a wide range from 0.1 to 160 mg/L. Physical characterizations with Fourier transform infrared (FT-IR), Raman, and X-ray photoelectron spectroscopies (XPS) demonstrated that the oxygen-containing functional groups on GO diminished after the electrochemical reduction at -0.8 V, yet still existed in large amounts, and the defect density changed as new sp² domains were formed. These changes demonstrated that this adjustment in the number of oxygen-containing groups might be the main factor affecting the electrocatalytic behavior of ERGO. Additionally, the defect density and sp² domains also exert a profound influence on this behavior. A possible mechanism for the TTC redox reaction at the GC/ERGO_-0.8V electrode is also presented. This work suggests that the electrochemical reduction is an effective method to establish new catalytic activities of GO by setting appropriate parameters.

Key words: Electrochemically reduced graphene oxide, Electrochemical detection, Tetracycline, Electrocatalytic activity, Oxygen-containing functional groups

Yanyan Xu, Mingming Gao, Guohui Zhang, Xinhua Wang, Jiajia Li, Shuguang Wang, Yuanhua Sang. Electrochemically reduced graphene oxide with enhanced electrocatalytic activity toward tetracycline detection[J]. Chinese Journal of Catalysis, 2015, 36(11): 1936-1942.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)60956-1

https://www.cjcatal.com/EN/Y2015/V36/I11/1936

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