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电化学(中英文) ›› 1999, Vol. 5 ›› Issue (2): 206-211. 

• 研究论文 • 上一篇    下一篇

玻碳电极上六氰亚铁酸钯膜的现场FTIR光谱电化学研究

薄爱丽,林祥钦   

  1. 中国科学院长春应用化学研究所电分析开放实验室,中国科学技术大学化学系
  • 收稿日期:1999-05-28 修回日期:1999-05-28 出版日期:1999-05-28 发布日期:1999-05-28

In Situ FTIR Spectroelectrochemical Study of Palladium Hexacyanoferrate Thin Film Deposited on Glassy Carbon Electrode

Bo Aili   

  1. ( Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun130022) Lin Xiangqin* ( Department of Chemistry, University of Science and Technology of China,Hefei230036
  • Received:1999-05-28 Revised:1999-05-28 Published:1999-05-28 Online:1999-05-28

摘要: 本文报道六氰亚铁酸钯膜修饰电极在HCl,KCl和NaCl溶液中的现场反射FTIR光谱电化学研究,结果表明该修饰膜具有内外两层结构,分别为Pd2Fe(CN)6和M2PdFe(CN)6,其中M为支持电解质一价阳离子.在1mol/LNaCl中,内层的氧化电位Em=0.87V(vs.Ag/AgCl),外层为0.77V.在1mol/LHCl或KCl中两层的氧化还原波重叠为一个大CV波峰而难以分辨,然而现场FTIR光谱电化学清晰地分辨出这两种结构在所有3种溶液中CN的不同振动频率,发现H+离子是最佳的支持电解质,能使这两种结构同时发生氧化反应

关键词: 现场, FTIR, 光谱电化学, 六氰亚铁酸钯, 玻碳电极

Abstract: The electrochemically deposited Palladium hexacyanoferrate thin film on Glassy Carbon electrode (PdHCF|GC) has been studied in HCl, KCl and NaCl solutions by in_situ external reflection FTIR spectroelectrochemical technique. It is found that the behavior of the electroactive PdHCF film can be understood in terms of two states: Pd2Fe(II)(CN)6 formed in the inner layer and (M+)2Fe(II)(CN)6 (M+: electrolyte cation) formed in the outer layer. The inner layer is oxidized at Em=0.87 V in 1 mol/L KCl, while for the outer layer Em=0.77 V(vs. Ag/AgCl). In 1 mol/L NaCl or HCl solutions, half_wave potentials of these two layers are not well resolved, however corresponding CN stretching frequencies for the two states have been well observed in all three solutions. H+ has been found as a good supporting electrolyte for redox reactions of these two layers.

Key words: In_situ , FTIR, Spectroelectrochemistry, Palladium hexacyanoferrate , Glassy carbon electrode

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