化学修饰电极的研究ⅩⅢ. 聚乙烯二茂铁(PVFc)薄膜电极和电催化效应

本文研究了影响PVFc薄膜电极伏安性质的各种因素, 讨论了聚合物薄膜电极的电荷传递过程。溶液平衡离子的水合半径大小、离子强度、溶剂对薄膜的溶胀性质以及聚合物薄膜的厚度是影响聚合物薄膜电极伏安性质的主要因素。研究了PVFc薄膜电极对亚铁氰化钾、左旋多巴和儿茶酚的电催化作用, 用旋转园盘电极研究了催化过程动力学。抗坏血酸和儿茶酚的混合物在PVFc薄膜电极上呈现分开的氧化还原峰, 有应用于生物化学分析的意义。

RESERCHES ON CHEMICALLY MODIFIED ELECTRODES ⅩⅢ POLYVINYL FERROCENE (PVFc) FILM ELECTRODE AND ITS ELECTROCATALYSIS

In this paper we report various factors which affect the voltammetry of PVFc polymer film electrode, and discuss the charge transport process of the polymer film electrode. Size of hydrated anion (counter ion), concentration of the electrolyte, swelling property of the film in the solvent and thickness of the film have significant effects on the voltammetry of the PVFc film electrode. We studied electrocatalysis of Fe(CN)_6~(4-), L-dopa and catechol by PVFc film electrode. We also studied the kinetic processes of these reactants at rotating disk electrode (RDE). The current peaks of the mixture of ascorbic acid and catechol can not be seperated at bare glassy carbon electrode but can be seperated well at PVFc film electrode. This result is meaningful for biochemical analysis.