电化学还原石墨烯用于水合肼的电催化氧化及检测

采用电化学还原技术制备了还原石墨烯.采用扫描电镜、Raman光谱、AFM等技术表征了石墨烯的形貌和结构特征.采用电化学测试技术研究了还原石墨烯修饰电极的电化学性能及对水合肼(N_2H_4·H_2O)的电催化氧化活性.结果表明,该石墨烯电极材料具有优异的电子传导性能.与裸玻碳电极相比,石墨烯修饰电极对水合肼表现出优异的电催化氧化活性.在最佳的实验条件下,将该石墨烯修饰电极用于水合肼的灵敏检测.在1×10~(-5)~1×10~(-4) mol/L范围内,氧化峰电流与水合肼的浓度呈良好的线性关系.该石墨烯修饰电极材料有望用于环境中水合肼等有机小分子的灵敏检测.

Preparation of Electrochemically Reduced Graphene and Its Electrocatalytic Oxidation toward Hydrazine

Reduced graphene oxide was prepared by using electrochemical reduction method.The morphology and structure of as-synthesized reduced graphene oxide were characterized using field emitting scanning electron microscopy,Raman spectroscopy,and atomic force microscope.The electrochemical properties of reduced graphene oxide were studied by cyclic voltammetry(CVs).The electrocatalytic activity of reduced graphene oxide toward N_2H_4·H_2O was investigated by using CVs and amperometric i-t curve.Experimental results demonstrated that reduced graphene oxide showed enhanced electrocatalytic activity towards the oxidation of hydrazine.The improved catalytic performance may be ascribed to the excellent electron conductive capability of reduced graphene oxide.The oxidation peak current of N_2H_4·H_2O was linear against the concentrations of N_2H_4·H_2O ranging from 1×10~(-5)~1×10~(-4) mol/L.The sensitive detection of N_2H_4·H_2O could sucessfully be performed on reduced graphene oxide modified eletrode.This study work was expected to promote the application of graphene'composite.