物理化学学报 >> 2001, Vol. 17 >> Issue (07): 636-640.doi: 10.3866/PKU.WHXB20010713

研究简报 上一篇    下一篇

γ-二氧化锰/K3[Fe(CN)6]溶液界面的电子转移反转区

郭源;李永军;何茂霞;夏熙   

  1. 新疆大学应用化学研究所,乌鲁木齐 830046
  • 收稿日期:2000-11-15 修回日期:2001-01-23 发布日期:2001-07-15
  • 通讯作者: 郭源 E-mail:guoyuan@xju.edu.cn

Observation of Electron-Transfer Inverted Region in γ-MnO2/K3[Fe(CN)6] Solution Interface

Guo Yuan;Li Yong-Jun;He Mao-Xia;Xia Xi   

  1. Institute of Applied Chemistry,Xinjiang University,Urumqi 830046
  • Received:2000-11-15 Revised:2001-01-23 Published:2001-07-15
  • Contact: Guo Yuan E-mail:guoyuan@xju.edu.cn

摘要: Marcus电子转移理论的主要成果之一是预言了电子转移反应反转区的存在.从实验上 验证Marcus反转区仍是一个热点问题.通过对γ-MnO2/K3[Fe(CN)6]溶液界面平带电位、极 化曲线的测量,计算了在极化条件下,γ-MnO2导带的电子直接转移到溶液中氧化态物种[F e(CN)6]3-空电子能级上的速率常数ket,logket对外加电位作图,观察到了Marcus反转区. 从理论上也论证了在半导体/溶液界面上的直接电子转移反转区的存在.

关键词: Marcus反转区, 电子转移, 动力学, γ-二氧化锰

Abstract: One of the main achievments of Marcus electron-transfer theory is the predictions of the existence of normal and inverted regions.Conformation of the existence of inverted regions has been a hot point by experiments.The direct el ectron-transfer rate constants were worked out between conduction band and the γ-MnO2/K3[Fe(CN)6] soluton interface by measuring the flat band potentials and the Tafel plots and Marcus type inverted regions were observed from logket~V(a pplied bias potential) curve.Furthermore,the existence of inverted regions was d emonstrated theoretically in direct electron transfers between the semiconductor /electrolyte interface.

Key words: Marcus inverted region, Electron-transfer, Kinetics, Manganese dioxide