碱性介质中(氢)氧化铜修饰电极电催化氧化蔗糖(英文)

• 作 者: Majid JAFARIAN Mehdi RASHVAND AVEI Iman DANAEE Fereydoon GOBAL Mohammad G.MAHJANI
• 机 构: Department of Chemistry,K.N.Toosi University of Technology,Abadan Faculty of Petroleum Engineering,P
• 出 处: 催化学报
• 发表日期: 2010年11期
• 关键词: 碱性介质 电催化氧化 修饰电极 rotating verify voltammetry anodic impedance subsequent AgCl

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 1000 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.

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 1000 mV without interfering peaks because there is no oxidation of copper. Drawing 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 Cu III 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 (hy dr) oxide Cu rotating disk electrode.