Electrocatalytic Oxidation of Dopamine at Graphene Modified Glass Carbon Electrode

doi:10.7503/cjcu20140277

Abstract

Abstract:

The graphene oxide(GO) bonded on glass carbon electrode(GCE) using 3-mercaptopropyol trimethoxysilane(METMS) as molecular bridge were electrochemically reduced to reduced graphene oxide(rGO) to form graphene modified glass carbon electrode(rGO-METMS-GCE). GO-METMS-GCE and rGO-METMS-GCE were characterized by SEM, FTIR, Raman spectroscopy and AFM. The electrochemical performances of rGO-METMS-GCE were studied by cyclic voltammetry(CV) and differential voltammetry(DPV). The results show that the electrocatalytic oxidation current of dopamine(DA) on rGO-METMS-GCE is about 4 times that on bare GCE. The oxidation and reduction potential difference(ΔE_p) of rGO-METMS-GCE is 66 mV, lower than that of bare GCE(202 mV). The rGO-METMS-GCE has remarkable electrocatalytic activity toward dopa mine oxidation and the redox reversibility of dopamine on the rGO-METMS-GCE is improved greatly.

Key words: Graphene, Glass carbon electrode, Dopamine(DA), Electrocatalytic oxidation

CLC Number:

O646
O657.1

TrendMD:

DANG Guoju, WANG Miao, WANG Zhaoqing, LI Haiyan, ZHANG Quansheng. Electrocatalytic Oxidation of Dopamine at Graphene Modified Glass Carbon Electrode[J]. Chem. J. Chinese Universities, 2014, 35(12): 2680.

Figures/Tables 12

Fig.1 SEM image of GO powder

Fig.2 FTIR spectra of GO(a) and graphite powder(b)

Fig.3 Raman spectra of graphite powder(A) and GO(B)

Fig.4 AFM image of single layer GO(A) and height profile of the black line in (A)(B)

Fig.5 Preparation process and mechanism of rGO-METMS-GCE

Fig.6 CV curves of 0.5 mol/L NaCl at GO-METMS-GCE Scan cycle: a. 1st; b. 2nd; c. 3rd; d. 4th; c. 5th; f. 6th.

Fig.7 Raman spectra of GO-METMS-GCE(A) and rGO-METMS-GCE(B)

Fig.8 SEM image of rGO-METMS-GCE

Fig.9 CV curves of 1×10-3 mol/L DA at GCE(PBS, pH=6.86)(a) and rGO-METMS-GCE(b) electrodes

Fig.10 CV curves of 1×10-3 mol/L DA at rGO-METMS-GCE(A) and plots of peak current vs. scan rate(PBS, pH=6.86, scan rate: 10—300 mV/s)(B) Scan rate/(mV·s-1): a. 10; b. 50; c. 100; d. 150; e. 200; f. 250; g. 300.

Fig.11 CV curves of 1×10-3 mol/L DA with different pH values at rGO-METMS-GCE(A) and plots of peak potential vs. pH(B) pH: a. 4.49; b. 5.91; c. 6.81; d. 9.18.

Fig.12 DPV curves of DA with different concentrations at rGO-METMS-GCE in PBS(pH=6.86) Concentration/(mol·L-1) of DA from a to k: 1×10-3, 5.0×10-4, 2.5×10-4, 1.25×10-4, 6.25×10-5, 3.13×10-5, 1.56×10-5, 7.81×10-6, 3.91×10-6, 9.77×10-7, 1.53×10-8.

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