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Citation: Fu Chong-Gang, Su Chang-Hua, Shan Rui-Feng. Electrochemical Properties of L-cysteine Self-assembled Membrane Modified ld Electrode[J]. Acta Physico-Chimica Sinica, ;2004, 20(02): 207-210. doi: 10.3866/PKU.WHXB20040221 shu

Electrochemical Properties of L-cysteine Self-assembled Membrane Modified ld Electrode

1.
School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng　252059

Received Date: 25 July 2003
Available Online: 15 February 2004

Electrochemical quartz crystal microbalance and cyclic voltammetry were employed for studying the formation mechanism and electrochemical properties of the self-assembled membrane formed on the surface of the ld electrode. Experimental results show that specific interaction exists between L-cysteine and the ld electrode surface, additionally, the L-cysteine molecular pairs were formed due to the existence of electrostatic attraction and hydrogen bond between themselves in the solution with the pH around isoelectric point. Consequently, an L-cysteine self-assembled bilayer could be formed on the ld electrode surface. A pair of stable redox peaks were observed with the self-assembled bilayer modified ld electrode when potential scanning in 0.2 mol•L－1 Hac-NaAc buffer solution in the range of －0.2～0.5 V (vs SCE). It was also found that the modified electrode has an obvious electrocatalytic effect on the electrooxidation of ascorbic acid.
- L-cysteine;Self-assembled bilayer;Electrochemical quartz crystal microbalance;Cyclic voltammetry;Electrochemical characteristics
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