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Solvated Electrons in Field- and Photo-Assisted Processes at Electrodes

  • B. E. Conway

Abstract

Solvated electrons can arise in electrode processes by photo- injection from the cathode under suitable conditions of illumination, by direct injection from the cathode into certain solvents by application of a sufficient potential difference at the cathode-solution interface, and by base-metal dissolution in special solvents such as ammonia and some amines. The possibility of photoassistance of electrode processes was recognized† in early work by Bowden1 and the involvement of solvated electrons by direct cathodic injection into suitable solvents was demonstrated, e.g., in the case of liquid NH3, by Birch3 and by Laitinen and Nyman.4 Early indications of such a process were found by Palmaer.5 The involvement of solvated electrons in electrochemical processes has recently become of considerable fundamental interest in regard to (a) the nature of electrochemical photoeffects not involving electronically excited states in solution, such as arise in the case of dye molecules; (b) the reactions which can be made to occur with solvated electron intermediates; (c) possible electrochemical engineering applications in cathodic reduction; and (d) in recent years, the hydrated electron has been proposed as a primary intermediate in cathodic hydrogen evolution8 and in metal dissolution in aqueous media9,10; the former proposal is obviously of great interest in regard to the whole problem of the mechanisms of the h.e.r. under various conditions and the latter idea is pertinent to the question of the role of supposed low-valence metal ions, e.g., Be+, Mg+, in base-metal dissolution.9a

Keywords

Work Function Electron Injection Electrode Process Solvate Electron Liquid Ammonia 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1972

Authors and Affiliations

  • B. E. Conway
    • 1
    • 2
  1. 1.University of SouthamptonEngland
  2. 2.University of Newcastle-on-TyneEngland

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