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

Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (20): 2067-2072. Previous Articles Next Articles

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. 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-Qin^1,2, SHEN Han-Xi¹

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

Abstract

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 i_pa⁰ 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 Δi_pa(μA)=-2.1036+2.3720×10⁴C_H₂O₂ (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

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LIU You-Qin, SHEN Han-Xi. Preparation of Cobalt Hydroxide Modified Glassy Carbon Electrode by Film Plating/Cyclic Voltammetry and Its Electrochemical Behavior[J]. Acta Chimica Sinica, 2004, 62(20): 2067-2072.

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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

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

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