基于溶胶-凝胶技术的聚烯丙胺基二茂铁化学修饰电极的组装及其对抗坏血酸的电催化氧化

Fabrication of Chemically-modified Electrode Containing Poly(allylamine)ferrocene Based on Sol-gel Technique and Its Electrocatalytic Oxidation of Ascorbic Acid

将聚烯丙胺基二茂铁与聚苯乙烯磺酸盐生成的离子配合物用乙醇溶解后掺杂到溶胶 -凝胶中 ,将此溶液滴涂在玻碳电极表面 ,制成化学修饰电极 .详细地研究了该修饰电极的电化学性能及其稳定性 .实验发现 ,在 0 .1 mol/L磷酸盐缓冲液 (p H=2 .5 )中 ,该修饰电极对抗坏血酸的电化学氧化具有很好的催化活性和稳定性 .

The functional molecular poly(allylamine)ferrocene was modified on the surface of glassy carbon electrode by the sol-gel technique. The electrochemical behavior of the modified electrode was characterized by cyclic voltammetry in detail. The results obtained show that the modified electrode exhibited an excellent electrocatalytic response to the oxidation of ascorbic acid. The anodic overpotential was reduced by about 190 mV compared with that obtained at a bare glassy carbon electrode for the oxidation of ascorbic acid. The modified electrode possesses several attractive features, such as simple preparation, fast response and so on.