Scanning electrochemical microscopy investigation of nitrate reduction at activated copper cathodes in acidic medium

被引：21
|
作者：
Lima, Alex S. [1 ]
Salles, Maiara O. [1 ]
Ferreira, Tiago L. [2 ]
Paixao, Thiago R. L. C. [1 ]
Bertotti, Mauro [1 ]
机构：
[1] Inst Quim USP, Sao Paulo, Brazil
[2] UNIFESP, Inst Ciencias Ambientais Quim & Farmaceut, Diadema, SP, Brazil
来源：
ELECTROCHIMICA ACTA | 2012年 / 78卷
基金：
巴西圣保罗研究基金会;
关键词：
Nitrate; Copper; Scanning electrochemical microscopy; Microelectrode; ELECTROCATALYTIC REDUCTION; MODIFIED ELECTRODE; SURFACE-STATE; NITRITE; DEPOSITION; MICROELECTRODE; INVOLVEMENT; CHLORIDES; WATER; IONS;
D O I：
10.1016/j.electacta.2012.06.075
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The cathodic reduction of nitrate at copper electrodes was investigated by using scanning electrochemical microscopy (SECM) in the stripping-mode SECM (SM-SECM). This electrochemical process is facilitated at surfaces activated by a potential protocol involving anodic dissolution and subsequent reduction of copper cations, which causes an increase in the surface area. In the presence of chloride, a much more significant current enhancement was noticed, and a mechanism based on the formation of CuCl was proposed to explain the increased rate of nitrate reduction at this experimental condition. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：446 / 451
页数：6
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