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《Chinese Journal of Analytical Chemistry》 2004-01
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Preparation of Hemin Modified Glassy Carbon Electrode and Its Interacting Mechanism

Liu Youqin,Shen Hanxi  (College of Chemistry, Nankai University, Tianjin 300071)  
The electrochemical behavior and electrocatalytic action of hemin modified glassy carbon electrode were studied with orthogonal design by cyclic voltammetry. Two kinds of states of hemin on glassy carbon electrode surface were observed, which were monomer and dimmer, with the cathodic peak potentials of -0.25±0.01 V,-0.43±0.01 V, respectively. They both exhibited good electrocatalytic activity for the reduction of H 2O 2, while the catalytic activity of monomer is by a factor of 1.45 higher than that of dimmer. The relevant interacting mechanism between hemin and H 2O 2 was given. The primary factor of influencing the stability of hemin membrane was pH of the supporting electrolyte according to the catalytic current (Δi) for the reduction of H 2O 2 after medium exchange. The optimal conditions for fabricating and testing hemin modified glassy carbon electrode were obtained by orthogonal design. The linear relationship between the catalytic current for the reduction of H 2O 2 and concentration of H 2O 2 is in the range of 1.7×10 -5 mol/L~1.6×10 -3 mol/L with a correlation coefficient of 0.9928. The detection limit is 1.7×10 -5 mol/L (S/k = 3). The catalytic activity remains well after two weeks, even 28% higher than the initial catalytic activity.
【Fund】: 国家自然科学基金资助课题 (No .2 0 0 75 0 12 )
【CateGory Index】: O657.1
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