物理化学学报 >> 2001, Vol. 17 >> Issue (12): 1102-1106.doi: 10.3866/PKU.WHXB20011209

研究论文 上一篇    下一篇

磷钼钨杂多酸-L-半胱氨酸自组装膜电极的电化学性质

王升富;杜丹;邹其超   

  1. 湖北大学化学与材料科学学院,武汉 430062
  • 收稿日期:2001-05-14 修回日期:2001-09-10 发布日期:2001-12-15
  • 通讯作者: 王升富 E-mail:WSF1964@263.net

Electrochemical Properties of L-cysteine Self-assembled Monolayers Modified

Wang Sheng-Fu;Du Dan;Zou Qi-Chao   

  1. College of Chemistry and Material Science,Hubei University,Wuhan 430062
  • Received:2001-05-14 Revised:2001-09-10 Published:2001-12-15
  • Contact: Wang Sheng-Fu E-mail:WSF1964@263.net

摘要: 磷钼钨杂多阴离子通过分子间静电作用吸附在L-半胱氨酸自组装单分子膜修饰金电极表面,制备了磷钼钨杂多酸-L-半胱氨酸自组装超分子膜电极,探讨了成膜条件.采用循环伏安(CV)、计时库仑(CC)、水平衰减全反射傅立叶变换红外光谱(ATR-FTIR)表征了膜的组成及电化学性质.实验发现,该膜电极在1.0 mol•L-1H2SO4溶液中,于0.8~-0.2 V(υs SCE)间CV扫描出现3对稳定、可逆的氧化还原峰,计时库仑法计算了薄膜内的电子传递系数D为 2.64×10-7 cm2•s-1,初步探讨了膜电极的氧化还原性能.

关键词: 静电吸附, 自组装膜, 化学修饰电极, 磷钼钨杂多酸, L-半胱氨酸

Abstract: Phosphomolytungstenbdic anions were adsorbed by electrostatic attraction gold electrode on modified L-cysteine self-assembled monolayers.The formation of the film was studied.Experiments showed that acidic medium was benefit to the adsorption of phosphomolytungstenbdic anions.The adsorbing quantity Γ0 is 2.57×10-10 mol•cm-2,which means a single layer on the surface.Cyclic voltammetry,chronocoulmetry,FTIR and SEM were used for the characterization and electrochemical properties of the films.Three stable and reversible redox couples were observed in 1.0 mol•L-1 H2SO4 in the range of 0.8~-0.2 V,which could be attributed to three electrochemical processes of phosphomolytungstenbdic anions.Charge transfer coefficient is 2.64×10-7 cm2•s-1 by chronocoulmetry.Redox properties were also described.

Key words: Electrostatic adsorption, Self-assembled film, Chemically modified electrode, hosphomolytungstenbdic anions, L-cysteine