Electrocatalytic reduction of nitrate ion on Cu and Ni poly-tetraaminophenylporphyrin-modified electrodes

被引:57
作者
Armijo, F
Isaacs, M
Ramírez, G
Trollund, E
Canales, J
Aguirre, MJ
机构
[1] Univ Santiago Chile, Fac Quim & Biol, Dept Quim Mat, Santiago 33, Chile
[2] Univ S Dakota, Dept Chem, Vermillion, SD 57069 USA
[3] Univ La Frontera, Dept Ciencias Quim & Ciencias Bas, Temuco, Chile
关键词
nitrate reduction; poly-aminophenylporphyrins; modified electrodes; electropolymerization; electroreduction process;
D O I
10.1016/j.jelechem.2003.11.043
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
In this study, six polymer-modified electrodes were used to electrocatalyze the reduction of nitrate in two aqueous media: 0.5 M HClO4 and 0.1 M NaClO4. These six polymers were prepared from the electropolymerization of tetrakis(x-aminophenyl)porphyrin (where x = o,p), and their Cu(II) and Ni(II) complexes in HCl solution on the surface of a conducting glass electrode. The results indicate that the catalytic response depends on the position of the amino group, the metal and the pH of the solution. In HClO4, the modified electrodes show two reduction processes. The voltammetric responses of the modified electrodes show a reduction process that takes place during the negative scan and another reduction process occurring during the return potential sweep. Indeed, there is a change in the number of reduction processes depending on the direction of the scan at low scan rate (5 mV s(-1)). In HClO4, the products of electrolysis are nitrite and nitrous oxide for Cu and Ni-ortho-polymers and nitrite for the others polymers. In NaClO4, only one reduction process takes place, independently of the direction of the scan, giving nitrite and nitrous oxide for the Ni and Cuortho systems and only nitrite for the other systems. In both cases, HClO4 and NaClO4, the best polymers are poly Cu(II) and Ni(II)tetrakis(o-aminophenyl)porphyrin as electrocatalysts. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:315 / 322
页数:8
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