催化学报

催化学报 ›› 2014, Vol. 35 ›› Issue (2): 247-254.DOI: 10.1016/S1872-2067(12)60753-0

• 研究论文 • 上一篇    下一篇

Electrocatalytic measurement of H2O2 concentration using bis(N-2-methylphenyl-salicyldenaminato)copper(Ⅱ) spiked in a carbon paste electrode

Hossein Khoshro, Hamid R. Zare, Rasoul Vafazadeh   

  1. Department of Chemistry, Yazd University, Yazd, 89195-741, Iran
  • 收稿日期:2013-08-29 修回日期:2013-11-04 出版日期:2014-01-16 发布日期:2014-01-17
  • 通讯作者: Hamid R. Zare

Electrocatalytic measurement of H2O2 concentration using bis(N-2-methylphenyl-salicyldenaminato)copper(Ⅱ) spiked in a carbon paste electrode

Hossein Khoshro, Hamid R. Zare, Rasoul Vafazadeh   

  1. Department of Chemistry, Yazd University, Yazd, 89195-741, Iran
  • Received:2013-08-29 Revised:2013-11-04 Online:2014-01-16 Published:2014-01-17
  • Contact: Hamid R. Zare

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摘要：

The electrochemical behavior of a bis(N-2-methylphenyl-salicyldenaminato)copper(Ⅱ) complex spiked in a carbon paste electrode (BMPSCu-CPE) and its electrocatalytic reduction of H2O2 were examined using cyclic voltammetry, chronoamperometry, and differential pulse voltammetry. Cyclic voltammetry was used to study the redox properties of BMPSCu-CPE at various potential scan rates. The apparent charge transfer rate constant and the transfer coefficient for the electron transfer between BMPSCu and the carbon paste electrode (CPE) were 1.9±0.1 s-1 and 0.43, respectively. BMPSCu-CPE had excellent electrocatalytic activity for H2O2 reduction in 0.1 mol/L phosphate buffer solution (pH 5.0), and it decreased the overpotential by 300 mV as compared to CPE alone. The diffusion coefficient and kinetic parameters such as the heterogeneous catalytic electron transfer rate constant and electron transfer coefficient for the reduction of H2O2 at the BMPSCu-CPE surface were also determined using electrochemical methods. Differential pulse voltammetry showed two linear dynamic ranges of 1.0-10.0 and 10.0-300.0 μmol/L and a detection limit of 0.63 μmol/L H2O2. The BMPSCu-CPE has excellent reproducibility and long term stability, and it was successfully applied for the determination of H2O2 in two pharmaceutical samples: an antiseptic solution and a hair dying cream.

关键词: Electrochemical behavior, Bis(N-2-methylphenyl-salicyldenaminato)copper(Ⅱ), complex, Hydrogen peroxides, Electrocatalytic reduction

Abstract:

The electrochemical behavior of a bis(N-2-methylphenyl-salicyldenaminato)copper(Ⅱ) complex spiked in a carbon paste electrode (BMPSCu-CPE) and its electrocatalytic reduction of H2O2 were examined using cyclic voltammetry, chronoamperometry, and differential pulse voltammetry. Cyclic voltammetry was used to study the redox properties of BMPSCu-CPE at various potential scan rates. The apparent charge transfer rate constant and the transfer coefficient for the electron transfer between BMPSCu and the carbon paste electrode (CPE) were 1.9±0.1 s-1 and 0.43, respectively. BMPSCu-CPE had excellent electrocatalytic activity for H2O2 reduction in 0.1 mol/L phosphate buffer solution (pH 5.0), and it decreased the overpotential by 300 mV as compared to CPE alone. The diffusion coefficient and kinetic parameters such as the heterogeneous catalytic electron transfer rate constant and electron transfer coefficient for the reduction of H2O2 at the BMPSCu-CPE surface were also determined using electrochemical methods. Differential pulse voltammetry showed two linear dynamic ranges of 1.0-10.0 and 10.0-300.0 μmol/L and a detection limit of 0.63 μmol/L H2O2. The BMPSCu-CPE has excellent reproducibility and long term stability, and it was successfully applied for the determination of H2O2 in two pharmaceutical samples: an antiseptic solution and a hair dying cream.

Key words: Electrochemical behavior, Bis(N-2-methylphenyl-salicyldenaminato)copper(Ⅱ), complex, Hydrogen peroxides, Electrocatalytic reduction