催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (11): 1351-1357.DOI: 10.1016/S1872-2067(10)60125-8

• 研究论文 • 上一篇    下一篇

碱性介质中 (氢) 氧化铜修饰电极电催化氧化蔗糖

Majid JAFARIAN1,*, Mehdi RASHVAND AVEI1, Iman DANAEE2, Fereydoon GOBAL3, Mohammad G. MAHJANI1   

  1. 1Department of Chemistry, K. N. Toosi University of Technology, P.O. Box 15875-4416, Tehran, Iran; 2Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, Iran; 3Department of Chemistry, Sharif University of Technology, P.O. Box 11365-8516, Tehran, Iran
  • 收稿日期:2010-05-29 出版日期:2010-11-12 发布日期:2014-03-28

Electrochemical Oxidation of Saccharose on Copper (Hydr)oxide- Modified Electrode in Alkaline Media

Majid JAFARIAN1,*, Mehdi RASHVAND AVEI1, Iman DANAEE2, Fereydoon GOBAL3, Mohammad G. MAHJANI1   

  1. 1Department of Chemistry, K. N. Toosi University of Technology, P.O. Box 15875-4416, Tehran, Iran; 2Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, Iran; 3Department of Chemistry, Sharif University of Technology, P.O. Box 11365-8516, Tehran, Iran
  • Received:2010-05-29 Online:2010-11-12 Published:2014-03-28

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摘要： A stable copper (hydr)oxide-modified electrode was prepared in 0.5 mol/L NaOH solution by cyclic voltammetry in the range of -250 to 1 000 mV. It can be used for electrochemical studies in the range of -250 to 1 000 mV without interfering peaks because there is no oxidation of copper. During an anodic potential sweep, the electro-oxidation of saccharose on Cu occurred by the formation of CuIII and this reaction also occurred in the early stages of the reversed cycle until it is stopped by the negative potentials. A mechanism based on the electro-chemical generation of CuIII active sites and their subsequent consumption by saccharose was proposed, and the rate law and kinetic parameters were obtained. The charge transfer resistance from theoretical and impedance studies was used to verify the mechanism. Under chronoamperometry regimes, the reaction followed Cottrellian behavior. The transfer of up to 21 electrons was observed in further investigations of the electro-oxidation of saccharose on a (hydr)oxide Cu rotating disk electrode.

关键词: saccharose, copper (hydr)oxide, equivalent circuit, electrocatalytic oxidation, mechanism

Abstract: A stable copper (hydr)oxide-modified electrode was prepared in 0.5 mol/L NaOH solution by cyclic voltammetry in the range of -250 to 1 000 mV. It can be used for electrochemical studies in the range of -250 to 1 000 mV without interfering peaks because there is no oxidation of copper. During an anodic potential sweep, the electro-oxidation of saccharose on Cu occurred by the formation of CuIII and this reaction also occurred in the early stages of the reversed cycle until it is stopped by the negative potentials. A mechanism based on the electro-chemical generation of CuIII active sites and their subsequent consumption by saccharose was proposed, and the rate law and kinetic parameters were obtained. The charge transfer resistance from theoretical and impedance studies was used to verify the mechanism. Under chronoamperometry regimes, the reaction followed Cottrellian behavior. The transfer of up to 21 electrons was observed in further investigations of the electro-oxidation of saccharose on a (hydr)oxide Cu rotating disk electrode.

Key words: saccharose, copper (hydr)oxide, equivalent circuit, electrocatalytic oxidation, mechanism