石墨烯修饰玻碳电极对多巴胺的电催化氧化

doi:10.7503/cjcu20140277

摘要/Abstract

摘要：

通过3-巯丙基三乙氧基硅烷(METMS)将氧化石墨烯(GO)固载到玻碳电极(GCE)表面, 用电化学方法还原GO制备石墨烯修饰玻碳电极(rGO-METMS-GCE). 利用傅里叶变换红外光谱(FTIR)、拉曼光谱(Raman)、扫描电子显微镜(SEM)和原子力显微镜(AFM)等技术对GO和rGO-METMS-GCE的结构和表面形貌进行表征. 采用循环伏安(CV)和差分脉冲溶出伏安(DPV)法研究了rGO-METMS-GCE对多巴胺(DA)的电催化氧化性能及反应机理. 结果表明, 与裸GCE相比, DA在rGO-METMS-GCE电极上的氧化还原峰电流(i_pa和i_pc) 增大4倍, 氧化峰电位负移106 mV, 氧化峰与还原峰电位差(ΔE_p)从202 mV降低至66 mV, DA电化学氧化可逆性明显改善, 表明rGO-METMS-GCE对DA电化学氧化具有显著电催化作用. DA在rGO-METMS-GCE上的反应机理为单电子转移过程.

关键词: 石墨烯, 玻碳电极, 多巴胺, 电催化氧化

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

中图分类号:

O646
O657.1

TrendMD:

党国举, 王淼, 王昭勍, 李海燕, 张全生. 石墨烯修饰玻碳电极对多巴胺的电催化氧化. 高等学校化学学报, 2014, 35(12): 2680.

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

图/表 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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