Investigation of Electrochemical Oxidation of L-Ascorbic Acid at CoCuHCF/Pt Electrode in Neutral Solutions by In situ FTIRRAS

Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (8): 1498.

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Investigation of Electrochemical Oxidation of L-Ascorbic Acid at CoCuHCF/Pt Electrode in Neutral Solutions by In situ FTIRRAS

WANG Xia-Yan¹, CUI Xing-Pin¹, CUI Yun-Mei², JIN Bao-Kang², LIN Xiang-Qin¹

1. Department of Chemistry, University of Science and Technology of China, Hefei 230026, China;
2. Department of Chemistry, Anhui University, Hefei 230039, China

Received:2001-08-16 Online:2002-08-24 Published:2002-08-24

Abstract

Abstract: Electrochemical oxidation reactions of L-ascorbic acid(AA) at a copper cobalt hexacyanoferrate modified electrode (CoCuHCF/Pt) in neutral solutions were studied in comparison with that at a bared Pt electrode by in situ FTIRreflection absorption spectroscopy(FTIRRAS). The results indicated that the electrode oxidation of AAat both the electrodes CoCuHCFfollowed by chemical processes. AAis oxidized to dehydro-L-ascorbic acid(DHA) followed by a chemical hydration process. At Pt electrode, the DHAunderwent hydration reaction to form bicyclic product, which then further was transformed into 2, 3-diketogulonic acid and its enol form via an opening of lactone ring. However, at CoCuHCF/Pt electrode, the DHAundergoes ring opening reaction and then degradation reaction.

Key words: L Ascorbic acid, Copper cobalt hexacyanoferrate, Chemically modified electrode, Electrocatalysis, In situ FTIRRAS

CLC Number:

O657.3

TrendMD:

WANG Xia-Yan, CUI Xing-Pin, CUI Yun-Mei, JIN Bao-Kang, LIN Xiang-Qin. Investigation of Electrochemical Oxidation of L-Ascorbic Acid at CoCuHCF/Pt Electrode in Neutral Solutions by In situ FTIRRAS[J]. Chem. J. Chinese Universities, 2002, 23(8): 1498.

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Investigation of Electrochemical Oxidation of L-Ascorbic Acid at CoCuHCF/Pt Electrode in Neutral Solutions by In situ FTIRRAS

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