A new oscillatory mechanism for the electro-oxidation of iodide involving two phase transitions and a disproportional reaction

被引：12

作者：

Chen, S

Huang, W

Niu, ZJ

Li, ZL ^{[1
]}

机构：

[1] Hunan Normal Univ, Coll Chem & Chem Engn, Dept Chem, Changsha 410081, Hunan, Peoples R China

[2] Zhejiang Normal Univ, Inst Chem Phys, Zhejiang Key Lab React Chem Solid Surfaces, Jinhua 321004, Peoples R China

来源：

CHEMICAL PHYSICS LETTERS | 2006年 / 421卷 / 1-3期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1016/j.cplett.2006.01.056

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Oscillations have been first observed during iodide oxidation in alkaline solution on a static platinum electrode, where phase transitions at the interface of electrode/solution are essential. The film formation of solid iodine acts as a negative nonlinear feedback slowing down the iodide oxidation due to its poor conductivity, and oxygen evolution as a positive nonlinear feedback by destroying the iodine film mechanically and by promoting its dissolution through convection mainly via a disproportional reaction. Based on the results of electrochemical experiments and in situ Raman spectroscopy, a tentative mechanism is given concerning the interfacial phase transitions and the disproportional reaction. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：161 / 165

页数：5

共 15 条

[1] Formation of Thick Layers of Iodine During the Anodic Oxidation of Iodide on a RDE [J].