Abstract.
We describe the preparation and characterization of Al-AlOx-Ag tunnel junctions and calculate the energy distribution of the tunneling hot electrons in the range 0–2.5 eV above the Fermi level of silver. Because the mean free path of the hot electrons is of the order of the thickness of the silver film of the junction, which is at the same time the electrode in contact with an electrolyte, new surface effects can be studied. Hot electrons can be injected into the nonhydrated electron band in water. Hot electrons also cause hydrogen evolution at electrode potentials more positive than the ones needed in common electrochemistry. We observed the emission of hot electrons into silver during transients of hydrogen oxidation at silver and during oxidation of overpotential hydrogen on platinum clusters deposited on the silver electrode. The tunnel current at constant tunnel voltage can be changed by faradaic reactions, but surprisingly also by nonfaradaic reactions; this is assigned to a mesoscopic quantum phenomenon.
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Acknowledgement.
We thank Walter Schultze and his company for various important scientific and technical support and Jürgen Noffke (TU Clausthal-Zellerfeld) for the data in Figs. 17, 18, 19, 30, 31, 32. The first part of this work was supported by the MWF of North Rhineland-Westphalia under contract no IV A5 103 00891. Our thanks also go to our former collaborators in the field of MIMs: Heike Gebkea Janssen, Matthias Hänisch, Andreas Schaak, Sven Schatteburg, Manuel Lohrengel, Steffen Rüße, Achim Walter Hassel and Diana Vilchez. We thank also Ralf Tölle for the results in Fig. 22 prior to publication.
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Diesing, D., Kritzler, G., Stermann, M. et al. Metal/insulator/metal junctions for electrochemical surface science. J Solid State Electrochem 7, 389–415 (2003). https://doi.org/10.1007/s10008-002-0319-y
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DOI: https://doi.org/10.1007/s10008-002-0319-y