Citation: LI Mei-Chao, WANG Wu-Yang, ZHU Wan-Xia, MA Chun-An. Electrocatalytic Oxidation of Ascorbic Acid on a PPy-HEImTfa/Pt Electrode and Its Mechanism[J]. Acta Physico-Chimica Sinica, ;2010, 26(12): 3212-3216. doi: 10.3866/PKU.WHXB20101218 shu

Electrocatalytic Oxidation of Ascorbic Acid on a PPy-HEImTfa/Pt Electrode and Its Mechanism

1.
1. Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou 310032, P. R. China;
2. State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, P. R. China

Received Date: 10 June 2010
Available Online: 5 November 2010
Fund Project: 浙江省自然科学基金(Y4100647) (Y4100647)浙江省分析测试科技计划(2008F70029)资助项目 (2008F70029)

A platinum electrode was electrochemically modified with polypyrrole (PPy) in the ionic liquid 1-ethylimidazolium trifluoroacetate (HEImTfa) to produce a modified electrode (PPy-HEImTfa/Pt). Its electrocatalytic performance toward the oxidation of ascorbic acid (0.1 mol·L^-1) was investigated by cyclic voltammetry. Compared with a bare Pt electrode and a PPy-H₂SO₄/Pt electrode, which was prepared in a solution of H₂SO₄, the peak potentials for ascorbic acid oxidation on the PPy-HEImTfa/Pt electrode decreased by 0.19 and 0.10 V, respectively. Additionally, the peak currents increased by 3.6 and 3.0 mA, respectively. Therefore, the electrocatalytic activity of the PPy-HEImTfa/Pt electrode for the oxidation of ascorbic acid was far better than that of the other systems. In situ Fourier transform infrared (In situ FTIR) spectroscopy results showed that the ascorbic acid was firstly oxidized to dehydroascorbic acid on the PPy-HEImTfa/Pt electrode and then underwent a fast hydration reaction to give hydrated dehydroascorbic acid in the aqueous solution. The hydrated dehydroascorbic acid then underwent further hydrolysis to form 2,3-diketogulonic acid by a ring opening reaction. Finally, a part of ascorbic acid was oxidized to CO₂ at high potentials.
- Electrocatalytic oxidation,
- 1-Ethylimidazolium trifluoroacetate,
- Polypyrrole,
- Ascorbic acid,
- In situ Fourier transform infrared spectroscopy
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沈阳化工大学材料科学与工程学院沈阳 110142