摘要
用化学吸附法首次制备了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),用循环伏安法(CV)研究了它们对抗坏血酸(AH_2)的电催化氧化.与未修饰玻碳电极(GC)相比,AH_2在ML CME(GC基体)上的氧化峰电位(Epa)负移150mV左右,氧比峰电流(Ipa)明显增大.各ML CME对AH_2的电催化氧化活性均有很高的稳定性.AH_2在ML CME上的氧化峰电流和AH_2的浓度之间有着良好的线性关系.
3,3', 3', 3 ''-Tetranitrophthalocyanine coordination compounds of Fe ( II ) , Co ( II ) , Ni ( II ) and Cu(II) chemically modified electrodes
(ML CMEs; M-metal ion, L-phthalocyanine ligand ) have been prepared for the first time using chemically adsorption method ( glass carbon electrode, φ= 3 mm; ML saturated solution; solvent, N, N-dime-thyl f formamide ) . The electrochemical properties of ML CMEs have been studied by the cyclic voltammetry ( see Fig. 1 to Fig. 4 and Table 1 ). The electrochemical behavior of ascorbic acid at the ML CMEs and the unmodified glass carbon electrode have been inverstiga-ted by the same method ( see Fig. 5 to Fig. 9 and Table2). The oxidation of ascorbic acid was irreversible at the ML CMEs as well as at the unmodified electrode, no reducting peak of ascorbic acid was found in the voltage range studied. Under the same experimental con-
ditions, compared with the unmodified glass carbon electrode, the oxidating peak voltage of ascorbic acid at the ML CMEs shifted about
150 mV negatively, and the oxidating peak current of ascorbic acid increased significantly. The electrocatalytic effects of the ML CMEs to the oxidation of ascorbic acid were found to be striking. There was a good linear relationship between the peak current of the electrocata-lytic oxidation of ascorbic acid and its concentration when the electrodes were the ML CMEs. But this relationship was absent when the electrode was unmodified glass carbon ( see Table 2 ) . Since the oxidation peak voltage of ascorbic acid at the ML CMEs was near the oxidating peak voltage of M(II)to M ( III ) , it is preposed that M ( II )/M ( III ) redox sites at the ML CMEs transported electrons from the adsorbed ascorbic acid molecules to the glass carbon electrodes to electrocataly tically oxidated ascorbic acid.
出处
《分子催化》
EI
CAS
CSCD
1989年第4期297-303,共7页
Journal of Molecular Catalysis(China)
