CRCU

Chemical Research in Chinese Universities ›› 1999, Vol. 15 ›› Issue (1): 10-16.

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In Situ Microscopic FTIR Spectroelectrochemistry of Ascorbic Acid in Poly(ethylene glycol)/LiClO4 Electrolyte Paste and in the Presence of Dispersed Cobalt Hexacyanoferrate Microcrystalline Powder

GUO Li-ping1, LIN Xiang-qin2   

  1. 1. Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022;
    2. Departmentof Chemistry, University of Science and Technology of China, Hefei, 230026
  • Received:1998-09-07 Online:1999-01-24 Published:2011-08-17
  • Supported by:

    Supported by the National Natural Science Foundation of China.

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Abstract: In situ microscopic FTIR spectroelectrochemical technique(MFTIRs) was applied to studying the electrochemical oxidation of ascorbic acid(AA) in poly(ethylene glycol)(PEG) paste at a 100 Lm diameter Pt disk electrode. Using this technique, the catalytic ability of cobalt hexacyanoferrate(CoHCF) microcrystalline toward AA oxidation was also studied. It was found that the dispersed CoHCF powder in the PEG paste can generate well shaped thin layer cyclic voltammetric waves with the peak height proportional to the scan rate, corresponding to the Fe centered redox reactions. This oxidation step catalyzed the AA oxidation. Also, this pasted CoHCF powder generated well resolved in situ MFTIRs spectra, by which a chemical interaction between C=C bond of AA ring and CoHCF lattice was revealed. A corresponding surface docking mechanism for the catalytic reaction has been proposed.

Key words: In-situ, MFTIRs, Ascorbic acid, Cobalt hexacyanoferrate, Polymer electrolyte, Microcrystalline, Docking mechanism