过渡金属酞菁配合物化学修饰电极的研究 ——Ⅱ.对联氨的电催化氧化

STUDIES ON THE TRANSITION METAL PHTHA-LOCYANINE COORDINATION COMPOUNDS CHEMICALLY MODIFIED ELECTRODES Ⅱ .ELECTROCATALYTIC OXIDATION OF HYDRAZINE

用不可逆吸附法首次制备了Fe(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)和Cu(Ⅱ)的3,3＇,3＇＇,3＇＇＇-四硝基酞菁配合物化学修饰电极(ML CME),研究了它们对联氨氧化的电催化作用,发现当电位扫描区间为-1.2—0.6V时,它们对联氨的氧化都有明显的电催出作用;而当电位扫描区间为-1.2—0.0V时,只有FeL CME和CoL CME具有明显的电催化作用.FeL CME和CoL CME对联氨的氧化不仅电催化活性高,而且稳定性也很高,具有很好的重复性,联氨电催化氧化峰电流与联氨浓度有良好的线性关系.初步拟定了ML CME电催化氧化联氨的机理.

3, 3', 3', 3''-Tetranitrophthalocyanine coordination compounds of Fe (Ⅱ) , Co (Ⅱ) , Ni (Ⅱ) , Cu (Ⅱ) chemically modified electrodes (ML CME)have been prepared for the first time using the irreversible adsorption method.The electrocat aly tic behaviors for the oxidation of hydrazine at the ML CME have been studied by Cyclic V oltammetry. The FeL CME and CoL CME showed very strong electrocataly tic effects to the oxidation of hydrazine and the stabilities of their electrocat aly tic effects were very high.The NiL CME had lower electrocataly tic effect to the oxidation of hydrazine.The CuL CME also had electrocataly tic effect on the oxidation of hydrazine, but its stability of electrocat aly tic effect was very low. There were very good linear relationships between the peak currents of the electrocataly tic oxidation of hydrazine and its concentrations for FeL CME and CoL CME.The mechanism of elect rocat aly tic oxidation of hydrazine by ML CME has been proposed.