2026-09-19T02:51:27Zhttps://ecommons.cornell.edu/server/oai/requestoai:ecommons.cornell.edu:1813/1209892026-05-15T17:52:53Zcom_1813_35col_1813_47
Pan, Zeyu
Suntivich, Jin
Singer, Andrej
2026-04-02T19:05:22Z
2026-04-02T19:05:22Z
2025-12
ProQuest Submission ID: 12607
ProQuest Publication ID: 32278564
https://hdl.handle.net/1813/120989
https://doi.org/10.7298/vnc2-xt60
17423346
43 pages
The electrochemical potential of an interface can be controlled by a potentiostat, which regulates the potential difference between the working and the reference electrodes. Under transient conditions, the electrochemical potential may deviate from the applied potential due to the Ohmic resistance (the RC element in the circuit). However, characterizing this deviation has been challenging. In this thesis, an optical method based on second harmonic generation (SHG) spectroscopy is used to monitor the electrochemical potential at the platinum (Pt)–water interface during a potential sweep. The results are compared to the constant potential baseline. We observe the deviation between the electrochemical potential and the applied value and that this gap widens with the potential sweep rate. This observation is consistent with the Ohmic resistance limitation; however, even after correcting for the Ohmic drop, the gap between the electrochemical potential and the applied value persisted, especially at high scan rates. This finding suggests that there is an intrinsic reorganization of the electrical double layer (EDL) beyond the Ohmic contribution. Our finding highlights the EDL dynamics beyond the equivalent circuit model and that the interpretation of the transient potential analysis may not as straightforward as previously considered.
en
Attribution-NonCommercial-ShareAlike 4.0 International
https://creativecommons.org/licenses/by-nc-sa/4.0/
Probing Interfacial Potential under Transient Conditions via Second Harmonic Generation at Pt-water interface
dissertation or thesis
application/pdf
Materials Science and Engineering
Cornell University
Master of Science
M.S., Materials Science and Engineering
https://hdl.handle.net/1813/59810.2
Publication
Cornell Theses and Dissertations
Pan, Zeyu
5893a6ea-7af3-41d7-abc6-04bcd26ab5df
open.access
open.access
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<Abstract>The electrochemical potential of an interface can be controlled by a potentiostat, which regulates the potential difference between the working and the reference electrodes. Under transient conditions, the electrochemical potential may deviate from the applied potential due to the Ohmic resistance (the RC element in the circuit). However, characterizing this deviation has been challenging. In this thesis, an optical method based on second harmonic generation (SHG) spectroscopy is used to monitor the electrochemical potential at the platinum (Pt)–water interface during a potential sweep. The results are compared to the constant potential baseline. We observe the deviation between the electrochemical potential and the applied value and that this gap widens with the potential sweep rate. This observation is consistent with the Ohmic resistance limitation; however, even after correcting for the Ohmic drop, the gap between the electrochemical potential and the applied value persisted, especially at high scan rates. This finding suggests that there is an intrinsic reorganization of the electrical double layer (EDL) beyond the Ohmic contribution. Our finding highlights the EDL dynamics beyond the equivalent circuit model and that the interpretation of the transient potential analysis may not as straightforward as previously considered.</Abstract>
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