高等学校化学研究 ›› 2010, Vol. 26 ›› Issue (2): 287-290.
Electro-oxidation of Ascorbic Acid on PVP-stabilized Graphene Electrode
HAN Dong-fang1,2, SHAN Chang-sheng1, GUO Li-ping2, NIU Li1 and HAN Dong-xue1*
- 1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
2. Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
Electro-oxidation of Ascorbic Acid on PVP-stabilized Graphene Electrode
HAN Dong-fang1,2, SHAN Chang-sheng1, GUO Li-ping2, NIU Li1 and HAN Dong-xue1*
- 1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
2. Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
摘要：
Polyvinylpyrrolidone-stabilized graphene(PVP-graphene) was synthesized and investigated as a modifier for the determination of ascorbic acid(AA). With PVP acting as stabilizer and dispersant, the resulting PVP-graphene material could disperse well into water. And the PVP-graphene modified glassy carbon electrode(PVP-graphene- GCE) showed an obvious electrocatalytical activity toward the oxidation of AA in a phosphate buffer solution(PBS, pH=7.0) with an oxidation potential of AA at 0.052 V vs. Ag|AgCl(sat. KCl). The calibration curve for AA was linear in a concentration range from 1.0×10–5 to 5.0×10–4 mol/L with a correlation coefficient of 0.9998. And the detection limit was found to be 1 μmol/L. During the oxidation of AA, the π-π interaction of graphene plane with conjugated hexenoic acid-lactone in AA molecules might play a key role. As a result, an obvious decrease of overpotential was achieved at such a PVP-graphene electrode through a possible adsorption/enrichment process, which will probably trigger potential applications for the electroanalysis of some aromatic and heterocyclic compounds.