物理化学学报 >> 2001, Vol. 17 >> Issue (06): 542-546.doi: 10.3866/PKU.WHXB20010614

研究论文 上一篇    下一篇

肾上腺素电氧化过程的快速扫描循环伏安研究

张占军;李经建;吴锡尊;张文智;蔡生民   

  1. 北京大学化学与分子工程学院,北京 100871;河北师范大学化学系,石家庄 050016
  • 收稿日期:2000-11-10 修回日期:2001-03-29 发布日期:2001-06-15
  • 通讯作者: 蔡生民 E-mail:caism@pku.edu.cn

Fast-scan Cyclic Voltammetry Study of Electrooxidation of Adrenaline

Zhang Zhan-Jun;Li Jing-Jian;Wu Xi-Zun;Zhang Wen-Zhi;Cai Sheng-Min   

  1. College of Chemistry and Molecular Engineering,Peking University,Beijing 100871;1Department of Chemistry,Hebei Teacher′s University, Shijiazhuang 050016
  • Received:2000-11-10 Revised:2001-03-29 Published:2001-06-15
  • Contact: Cai Sheng-Min E-mail:caism@pku.edu.cn

摘要: 以快速循环伏安法为主要手段,研究了肾上腺素电化学氧化反应机理.肾上腺素在1 m ol•dm-3 H2SO4中的电化学氧化反应,具有扩散控制的基本特征,并伴随着电活性质粒的 弱吸附现象.在快速电势扫描条件下,肾上腺素电氧化过程遵从EC反应机理.当肾上腺素浓度低于1.00×10-3 mol•dm-3时,吸附现象的特征趋于显现出来;在快速电势扫描速率下,电活性质粒吸附的特征更加明显.结合表面伏安法分析,估算了肾上腺素电氧化过程的传递系数α=0.264.电化学反应速率常数ks=31.81 s-1.

关键词: 肾上腺素, 电化学氧化反应, 循环伏安法, 快速循环伏安法, 弱吸附

Abstract: The mechanism of the electrochemical oxidation of adrenaline was studied using fastscan cyclic voltammetry as a major means.In 1 mol•dm-3 H2SO4,the electrooxidation of adrenaline showed the elementary characteristics of diffusion and were companied by the weak adsorption of electroactive species.In the case of fastscan test,the electrooxidation of adrenaline was considered to obey EC(electron transferchemical reaction) mechanism..When the concentration of adrenaline was below 1.00×10-3 mol•dm-3,the characteristics of adsorption was easily detected.And the characteristics of adsorption became more evident as the concentration of adrenaline was decreased or the potential scan rate was increased.The transfer coefficient α and the rate constant of the electrochemical reaction ks were calculated as 0.264 and 31.81 s-1 respectively.

Key words: Adrenaline, Electrochemical oxidation, Fast-scan cyclic voltammetry,   Cyclic voltammetry, Weak adsorption