物理化学学报 >> 1995, Vol. 11 >> Issue (02): 185-188.doi: 10.3866/PKU.WHXB19950218

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聚苯胺对抗坏血酸的电催化氧化及磁效应

蔡林涛, 姚士冰, 周绍民   

  1. 厦门大学化学系|厦门 361005
  • 收稿日期:1993-12-08 修回日期:1994-04-15 发布日期:1995-02-15
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Electrocatalytic Oxidation of Ascorbic Acid at Polyaniline Modified Electrode and the Effects of the Magnetic Field

Cai Lin-Tao, Yao Shi-Bing, Zhou Shao-Min   

  1. Department of Chemistry,Xiamen University,Xiamen 361005
  • Received:1993-12-08 Revised:1994-04-15 Published:1995-02-15
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关键词: 聚苯胺, 磁效应, 抗坏血酸, 电催化氧化

Abstract:

The electrocatalytic oxidation of ascorbic acid(AA) in H2SO4 solution at polyaniline(PAN) modified electrode was studied by cyclic voltammetry(CV). The electrocatalytic behavior was affected by the PAN film thickness(D), the pH values of solution, the AA concentration and the metalic cation. The results show that the peak current has good linear relationship with the AA concentration at pH=4.5, D=0.1μm in 1o-2 ~10-8mol?L-1 AA. The electrocatalytic activity was strengthened by Cu2+ and Fe2+ ions. The CV behavior was also investigated under the magnetic fields up to 0.7T(1T=104 Gauss). Plateaus of limiting currents were observed when the magnetic flux was directed in parallel to the surface of electrode. The phenomena were explained by the enhancement of mass transfer by magnetohydrodynamic (MHD) convection. The magnetic field effects was found to be pronounced at the slow potential scan rate of 10mv?s-1. But when the magnetic flux directed in perpendicular to the surface of electrode, the effect was not observed.

Key words: Polyaniline, Ascorbic acid, MHD, Magnetic field effect, Electrocatalytic oxidation