镍氢氧化物修饰玻碳电极的制备及其电化学行为

采用一种新方法———镀膜/循环伏安法成功制备了镍氢氧化物修饰玻碳电极。考察了影响镍氢氧化物膜电催化活性的因素,确定最佳富集时间为2min,最佳富集电位为-1.4V。讨论了成膜过程及机理。膜氧化峰电流及催化氧化峰电流均受扩散控制。制得的镍氢氧化物膜修饰电极具有相当的稳定性,并对H2O2的电氧化表现出较高的电催化活性。该电极对H2O2响应的线性范围为1.71×10-5~1.33×10-2mol/L,检出限为2.86×10-6mol/L(S/N=3)。

Preparation of Nickel Hydroxide Modified Glassy Carbon Electrode and Its Electrochemical Behavior

Nickel hydroxide modified glassy carbon electrode was successfully prepared by a new method-film plating/cyclic voltammetry.Various factors affecting the elcetrocatalytic activity of nickel hydroxide film were investigated,with the optimal time and potential of cathodic enrichment being 2 min and -1.4 V,respectively.The process and mechanism of film-forming were discussed.The anodic peak current and catalytic anodic peak current of nickel hydroxide film were both controlled by diffusion. The nickel hydroxide modified electrode had considerable stability and showed high electrocatalytic activity towards the oxidation of H_(2)O_(2).The linear range for the determination of H_(2)O_(2) was 1.7110~(-5)~1.3310~(-2) (mol/L) with a detection limit of 2.8610~(-6) mol/L (S/N=3).