Nitrate and nitrite electrocatalytic reduction on Rh-modified pyrolytic graphite electrodes

被引：207

作者：

Brylev, Oleg

Sarrazin, Mathieu

Roue, Lionel

Belanger, Daniel

机构：

[1] Univ Quebec, Dept Chim, Montreal, PQ H3C 3P8, Canada

[2] INRS Energie, Varennes, PQ J3X 1S2, Canada

来源：

ELECTROCHIMICA ACTA | 2007年 / 52卷 / 21期

基金：

加拿大自然科学与工程研究理事会;

关键词：

rhodium; double-pulse electrodeposition; nitrate reduction; nitrite reduction; electrocatalysis;

D O I：

10.1016/j.electacta.2007.03.072

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electrochemical reduction of nitrate and nitrite anions was investigated on Rh-modified pyrolytic graphite electrodes prepared by potentio-static electrodeposition with the use of a double-pulse technique. Several important parameters (pH, temperature and composition of electrolytic medium, electrolysis potential) were varied. Only ammonia and nitrite ions were detected among NO3- reduction products, while NO2- ions are straightforwardly reduced to ammonia. The experimental data (CV measurements and the results of electrolyses) clearly show that Rh/graphite electrodes are much more efficient for NO2- reduction than for that of NO3- at room temperature which was confirmed by the determination of rate constants of corresponding reactions and the activation energy of NO2- reduction. The influence of carboxylate anions and tetraalkylammonium cations on the electrocatalytic activity of Rh/graphite electrodes was investigated and the inhibiting effect of HCOO- anions on hydrogen evolution reaction and nitrate reduction was demonstrated. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：6237 / 6247

页数：11

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