Electrochemical reactions are heterogeneous chemical reactions occuring at the electrode/electrolyte interface. They are accompagnied by the transfer of electrical charge across the interface. Electrons from both the conduction or valence bands can take part in the electrode process. Thus four different electron transfers can occur at the interface. The semiconductor/electrolyte junction can be then used in order to determine the transfer mechanisms and principally to detect easily electron and/or hole injection processes related to chemical species bound with crystal lattice. These phenomenon take place when multielectronic electrochemical reactions occur at the interface, such as reductions (hydrogen, oxygen, hydrogen peroxide..) or oxidations (anodic decomposition..). In this paper a comparison between III-V compounds has been analyzed. The influence of anion and cation elements in the overall process has been studied. Moreover, the influences of the reaction intermediate characteristics and growth or dissolution of oxide films have been discussed in order to a more understanding of the reaction mechanism.
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