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(ipa和ipc)增大4倍,氧化峰电位负移106mV,氧化峰与还原峰电位差(ΔEp)从202mV降低至66mV,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.
The graphene oxide（ GO） bonded on glass carbon electrode（ GCE） using 3-mercaptopropyol trime-thoxysilane（ 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（△Ep） 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 oxi-dation and the redox reversibility of dopamine on the rGO-METMS-GCE is improved greatly.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第12期2680-2687,共8页
Chemical Journal of Chinese Universities
关键词
石墨烯
玻碳电极
多巴胺
电催化氧化
Graphene
Glass carbon electrode
Electrocatalytic oxidation
