化学学报 ›› 2004, Vol. 62 ›› Issue (20): 2067-2072. 上一篇    下一篇

研究论文

钴氢氧化物修饰玻碳电极的镀膜/循环伏安法制备及其电化学行为

刘有芹1,2, 沈含熙1   

  1. 1. 南开大学化学系, 天津, 300071;
    2. 华南农业大学理学院应用化学系, 广州, 510642
  • 投稿日期:2004-03-01 修回日期:2004-05-28 发布日期:2014-02-17
  • 通讯作者: 沈含熙,E-mail:hxshen@eyou.com;Tel:022-27416560;Fax:022-23502458 E-mail:hxshen@eyou.com
  • 基金资助:
    国家自然科学基金(No.20075012)资助项目.

Preparation of Cobalt Hydroxide Modified Glassy Carbon Electrode by Film Plating/Cyclic Voltammetry and Its Electrochemical Behavior

LIU You-Qin1,2, SHEN Han-Xi1   

  1. 1. Department of Chemistry, Nankai University, Tianjin 300071;
    2. Department of Applied Chemistry, College of Sciences, South China Agricultural University, Guangzhou 510642
  • Received:2004-03-01 Revised:2004-05-28 Published:2014-02-17

采用一种新方法镀膜/循环伏安法成功制备了钴氢氧化物修饰玻碳电极.考察了影响钴氢氧化物膜电催化活性的因素,确定最佳富集时间为2 min,最佳活性单元浓度为9.90×10-4mol·L-1.讨论了成膜过程及机理.膜氧化峰电流(ipa0)与扫描速率(v<0.60 V·s-1)成正比,具有表面吸附反应特征,表面覆盖量约相当于0.5个单层的氧化还原活性物质.制得的钴氢氧化物膜修饰电极具有相当的稳定性,并对H2O2氧化表现出较高的电催化活性.线性回归方程为:△ipa(μA)=-2.1036+2.3720×104CH2O2(mol·L-1)(R=0.9990,n=18),线性范围为:1.43×10-5~1.80×10-2mol·L-1,检出限为:9.59×10-6mol·L-1(3S/k).

关键词: 钴氢氧化物, 阴极富集, 循环伏安法, 电催化

Cobalt hydroxide modified glassy carbon electrode was prepared by a new method——film plating/cyclic voltammetry. Various factors affecting the electrocatalytic activity of cobalt hydroxide film were investigated, with the optimal time of cathodic enrichment and the optimal concentration of active species being 2 min and 9.90×10-4 mol·L-1, respectively. The process and mechanism of film-forming were discussed. The anodic peak current ipa0 of cobalt hydroxide film was proportional to scanning rate (v=0.60 V·s-1), indicating the characteristics of a surface adsorbed redox species corresponding to 0.5 monolayer. The resulting cobalt hydroxide film modified electrode had considerable stability and showed high electrocatalytic activity towards the oxidation of H2O2. The linear regression equation is Δipa(μA)=-2.1036+2.3720×104 CH2O2 (mol·L-1) (R=0.9990, n=18) and the linear range for the determination of H2O2 is 1.43×10-5~1.80×10-2 mol·L-1 with a detection limit of 9.59×10-1 mol·L-6(3S/k).

Key words: cobalt hydroxide, cathodic enrichment, cyclic voltammetry, electrocatalysis