4,4′,4″,4^(?)—四硝基酞菁合钴(Ⅱ)化学修饰电极对草酸和抗坏血酸的电催化氧化

STUDIES ON CATALYTIC ELECTROOXIDATION OF OXALIC ACID ANDASCORBIC ACID ON COBALT 4,4' ,4"4"'-TETRANITRO PHTHALOCYANINECOORDINATION COMPOUND CHEMICALLY MODIFIED ELECTROD

以玻碳为基体,以标题化合物为修饰物,以不可逆吸附法制备了一种具有电催化功能的化学修饰电极,并用光电子能谱法进行了表面表征。用循环伏安法研究了该化学修饰电极对草酸和抗坏血酸氧化过程的电催化作用。

Cobalt 4,4' ,4',4''-tetranitro phthalocyanine coordination compound chemically modified electrode (CoTNPc CME;TNPc,4,4', 4', 4''-tetranitro phthalocyanine) was prepared for the first time using chemically adsorption method (glass carbon electrode, =3mm;CoTNPc saturated solution ;solvent,N,N-dimehtyl formamide,or pyridine,or tetrahytrofuran) ,and characterized by X -ray photoelectron spectrometry. The electrochemical properties of CoTNPc CME was studied by the cyclic voltammatry (see Fig. 1). The electrochemical behaviors of oxalic acid and ascorbic acid were in-verstigated by the same method (see Fig. 2 to Fig. 4 and Table 1). Under the same experimental conditions, compared with the unmodified glass carbon electrode,the oxidating peak potential of oxalic acid and ascorbic acid at the CoTNPc CME shifted negatively, and the oxidating peak current of them increased significantly. So the electrocatalytic effects of CoTNPc CME to the oxidation of oxalic acid and ascorbic acid were found to be striking. It was proposed that Co(Ⅲ)/Co(Ⅱ) redox sites at the CoTNPc CME transported electrons from oxalic acid or ascorbic acid to the glass carbon electrode to electro-catalytically oxidate them.