Electrochemical behavior of cysteine at a CuGeO₃ nanowires modified glassy carbon electrode

详细信息    查看全文

• 作者：YongPing Dong ; LiZhai Pei ; XiangFeng Chu ; WangBing Zhang ; QianFeng Zhang
• 关键词：CuGeO₃ ; Nanowire ; Modified electrode ; Cysteine
• 刊名：Electrochimica Acta
• 出版年：2010
• 出版时间：15 July 2010
• 年：2010
• 卷：55
• 期：18
• 页码：5135-5141
• 全文大小：1000 K

文摘

A CuGeO₃ nanowire modified glassy carbon electrode was fabricated and characterized by scanning electron microscopy. The results of electrochemical impedance spectroscopy reveal that electron transfer through nanowire film is facile compared with that of bare glassy carbon electrode. The modified electrode exhibited a novel electrocatalytic behavior to the electrochemical reactions of l-cysteine in neutral solution, which was not reported previously. Two pairs of semi-reversible electrochemical peaks were observed and assigned to the processes of oxidation/reduction and adsorption/desorption of cysteine at the modified electrode, respectively. The electrochemical response of cysteine is poor in alkaline condition and is enhanced greatly in acidic solution, suggesting that hydrogen ions participate in the electrochemical oxidation process of cysteine. The intensities of two anodic peaks varied linearly with the concentration of cysteine in the range of 1 × 10⁻⁶ to 1 × 10⁻³ mol L⁻¹, which make it possible to sensitive detection of cysteine with the CuGeO₃ nanowire modified electrode. Furthermore, the modified electrode exhibited good reproducibility and stability.