铁氰化钴/铜复合膜修饰电极的制备及其对肼的电催化

采用循环伏安法制备了铁氰化钴/铜(Cu/CoHCF)复合膜化学修饰电极,研究了该修饰电极的电化学性质及电催化活性。结果表明,复合物不是铁氰化钴(CoHCF)与铁氰化铜(CuHCF)的简单混合物,而是钴、铜共沉积形成的多核铁氰化物。该电极对肼具有良好的电催化活性。在优化条件下,安培法检测肼的线性范围为4.6×10-6～4.4×10-2 mol.L-1,检测限(3Sb,n=11)为8.0×10-7 mol.L-1,灵敏度为143.1"A.(mmol.L-1)-1。该法已用于模拟水样中肼含量测定。

Preparation and Application of A Composite Copper/Cobalt Hexacyanoferrate Film Modified Electrode

A Cu/CoHCF composite film chemically modified electrode was fabricated by using cyclic voltammetry.The electrochemical behavior and electrocatalytic activity of the resulting modified electrode were also investigated carefully.The experimental results showed that composite film is not the simple mixture of CoHCF and CuHCF,but a composite hexacyanoferrate film derived from the co-deposition of copper and cobalt ions.Additionally,this modified electrode exhibited high electrocatalytic activity towards the oxidation of hydrazine.Under the optimal conditions,the oxidation peak current showed a linear relationship with the concentration of hydrazine in the range of 4.6×10-6~4.4×10-2 mol·L-1 with a sensitivity of 143.1 μA·（mmol·L-1）-1 and detection limit（3Sb,n = 11） of 8.0×10-7 mol·L-1,respectively.The proposed method was applied in the determination of hydrazine in stimulant water solution.