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

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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

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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