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Strain imaging of electrochemical reactions of a solid electrolyte Cu 2 S
Author(s) -
Tamura Ryota,
Takata Keiji
Publication year - 2014
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5583
Subject(s) - electrolyte , electrochemistry , dissolution , redox , electrode , materials science , precipitation , chemistry , analytical chemistry (journal) , chemical engineering , metallurgy , physics , meteorology , engineering , chromatography
The electrochemical behavior of a solid electrolyte Cu 2 S was investigated using strain imaging. The precipitation or dissolution of Cu in Cu 2 S induces changes in volume. Scanning probe microscopy detects the changes in volume through surface displacements with high resolution, and so, we can observe the extension of redox‐induced regions. The Cu filaments grew as the voltages were increased, and finally, a Cu bridge between the upper and lower electrodes was formed. When the Cu bridge was formed, electrochemical reactions were considerably suppressed because a large part of the current flowed through the Cu bridge. This was proven by the substantial decreases in the detected surface displacements. Further, growth of filaments was suppressed and the one‐bridge connection was kept, which led to high‐speed switching because the time required for disconnection was shortened. Copyright © 2014 John Wiley & Sons, Ltd.