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采用水热法在400℃的条件下煅烧并形成Co_3O_4微球,通过XRD粉末衍射、SEM等对Co_3O_4结构及形貌进行表征,并用循环伏安法(Cyclic Voltammetry,CV)和电化学阻抗谱法(Electrochemical Impedance Spectroscopy,EIS)对Co_3O_4的电化学性能进行表征。利用Co_3O_4修饰玻碳电极(Co_3O_4/GCE)并通过方波伏安法(Square wave voltammetry,SWV)检测邻苯二酚,在3.3~33μmol/L的浓度范围内,邻苯二酚浓度和峰电流值呈线性关系,回归方程的相关系数为0.995,检测限(LOD)为0.42μmol/L(3σ法),灵敏度为0.029μA·(μmol/L)-1。同时进行了电极的稳定性实验,经10次循环,其峰电流的相对标准偏差(RSD)为0.25%。还对实际水样进行加标回收实验,该电极对实际水样的检测呈现出良好的性能。
The hydrothermal method was used to calcine and form Co_3O_4 microspheres under the condition of 400 ℃. The structure and morphology of Co_3O_4 were characterized by XRD, XRD and SEM. The cyclic voltammetry (CV) and electrochemical impedance spectroscopy Electrochemical Impedance Spectroscopy (EIS) was used to characterize the electrochemical performance of Co_3O_4. Catechol was detected by Co_3O_4 modified glassy carbon electrode (Co_3O_4 / GCE) and square wave voltammetry (SWV). The concentration of catechol and peak current in the range of 3.3 ~ 33μmol / L The correlation coefficient of regression equation was 0.995, the limit of detection (LOD) was 0.42μmol / L (3σ) and the sensitivity was 0.029μA · (μmol / L) -1. At the same time, the stability of the electrode was tested. After 10 cycles, the relative standard deviation (RSD) of peak current was 0.25%. The actual water samples were also spiked recovery experiments, the electrodes on the actual water samples showed good performance.