Inherent emf relaxation of electrochemical cells with nanocrystalline Ag electrodes |
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Authors: | Alexandra Schrö der,Joachim Maier,Werner Sitte |
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Affiliation: | a Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany b University of Leoben, Department of General, Analytical and Physical Chemistry, Franz-Josef-Straße 18, A-8700 Leoben, Austria |
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Abstract: | The open circuit voltage of the electrochemical cell Ag (nano)|solid silver electrolyte|Ag (macro) is found to be inherently unstable. Even under conditions which support the morphological stability of the arrangement of nanocrystalline silver, the particles grow significantly as soon as they function as electrodes; i.e. when they are in contact with a silver electrolyte and connected electronically at the same time. The process is shown to be due to electrochemical Ostwald ripening with the interfacial transfer of Ag+ through the Ag/electrolyte interface being the rate limiting step. Its activation energy is 0.01 eV. The decay is in good agreement with modelling results. |
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Keywords: | Ostwald ripening Capillary effects Size effects Solid electrolyte Grain growth |
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