高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (5): 927.

• 研究论文 • 上一篇    下一篇

高铁酸盐在SnO2-Sb2O3/Ti电极上的选择性电化学合成

张存中1,2, 刘震1,2, 林丽君1, 齐菲1, 吴锋1,2   

  1. 1. 北京理工大学化工与环境学院;
    2. 国家高技术绿色材料发展中心, 北京100081
  • 收稿日期:2004-05-12 出版日期:2005-05-10 发布日期:2005-05-10
  • 通讯作者: 吴　锋(1951年出生),男,教授,博士生导师,从事应用化学与功能材料方面研究.E-mail:wufeng863@vip.sina.com E-mail:wufeng863@vip.sina.com
  • 基金资助:

    国家重点基础研究发展计划(批准号:2002CB211800);国家基础研究重大项目前期研究专项(批准号:2001CCA05000)资助.

Selective Electrochemical Synthesis of Ferrate on SnO2-Sb2O3/Ti Electrodes

ZHANG Cun-Zhong1,2, LIU Zhen1,2, LIN Li-Jun1, QI Fei1, WU Feng1,2   

  1. 1. School of Chemical Engineering and Environment;
    2. National Development Center of Hitech Green Materials, Beijing Institute of Technology, Beijing 100081, China
  • Received:2004-05-12 Online:2005-05-10 Published:2005-05-10

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摘要： 合成了SnO2-Sb2O3/Ti电极材料.实验结果证实,在14mol/LNaOH水溶液中和完全避免析氧反应的条件下,Fe(Ⅱ)物种在该电极上进行电化学氧化并生成FeO42-.结果表明,Fe(OH)3在浓NaOH溶液中发生酸式电离,形成可溶于水的FeO2-,该离子的浓度随着碱溶液浓度变化而发生明显变化,而且它还是发生化学氧化和电化学氧化的反应物.在SnO2-Sb2O3/Ti电极上,FeO42-的电化学还原起始电位为0.38V(vs.Hg/HgO,14mol/LNaOH),FeO2-电化学氧化起始电位为0.54V.结果还表明,用电化学方法氧化Fe(Ⅱ)物种生成FeO42-是个多步骤过程.

关键词: 高铁酸盐, 电化学氧化, 尺寸稳定阳极, 循环伏安, 二次电池

Abstract: The electrode of SnO2-Sb2O3/Ti was manufactured in this research. The results prove that the electrochemical generation of FeO2-4 could be carried out on this kind of electrode in a 14 mol/L NaOH solution without any impact of the side reaction of oxygen evolution reaction(OER) under the same experimental condition. The results indicate that the dissoluble ion, FeO2- is one of existent formations of (Fe(Ⅲ) compounds), the ion is a reactant of the chemical oxidation and electrochemical oxidation, the redox couple is not FeO2-4/Fe(OH)3, but FeO2-4/FeO2- in the concentratied NaOH solution. The feebly amphoteric property of Fe(Ⅲ) compounds plays a considerable role in the manufacture of safety rechargeable batteries. Furthermore, the onset potential value of electro-oxidation of FeO2-(0.38 V vs. Hg/HgO, 14 mol/L NaOH) is close to that of electro-reduction of FeO2-4(0.54 V) under the same research condition. The results also indicate that the mechanism of electrochemical generation of FeO2-4 from FeO2- is an electro-chemical mechanism. In addition, the excellent stability of the SnO2-Sb2O3/Ti electrode was exhibited under the research condition.

Key words: Ferrate, Electro-oxidation, Dimensionally stable anode(DSA), Cyclic voltammetry, Secondary battery

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