线性扫描伏安法研究 II: 超微盘电极上催化电流理论

本文提出了超微盘电极上线性扫描伏安法催化电流理论及恒电位催化电流方程式,证实在k~1~1~z值足够大的条件下, 两种方法具有相同的电流-电位方程式。对理论进行了验证, 测定了亚铁氰化钾-氨基比林-氢氧化钾体系的化学反应速率常数(k~f)。

Investigation on linear sweep voltammetry II: The theory of catalytic current at ultramicrodisk electrode

The equations for catalytic wave at ultramicrodisk electrode with linear sweep voltammetry and constant potential voltammetry are derived. It is shown that when krcz* (where kf is the rate constant for the chem. reaction, cz* is the concentration of catalyst) is larger, the same current-potential relations can be obtained. Experiments were carried out on platinum ultramicrodisk electrode to verify the theory. Theor. conclusions are in good agreement with experimental data for the oxidation of K4Fe(CN)6 in antipyrine-KOH solution The rate constant for catalytic reaction (kf) is also determine