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Title: Current Density Distribution in Electrochemical Cells with Small Cell Heights and Coplanar Thin Electrodes as Used in ec-S/TEM Cell Geometries

Abstract

The electrochemical engineering aspects of high aspect ratio cells, such as those used in in situ electrochemical scanning transmission microscopy (ec-S/TEM) were examined, focusing on aspects that could cause non-uniform current distribution. Having a uniform current distribution across the working electrode is important for any spectroelectrochemical technique in order to provide accurate electrochemical information as well as structural electrolyte-electrode interface information. An analytical model was developed to determine current density distribution and a Wagner number was derived for a small cell height with coplanar electrodes. The main assumptions of this analysis are: 1) mass transport effects are negligible, 2) a uniform potential distribution in the direction of the cell height due to their small size, and 3) the working electrode potential is constant across its length. With our analysis, the assumptions were found to be reasonable. In addition, the effect of the conductivity and thickness of the thin film electrode and its potential effect on current density distribution have been analyzed. Now, with this work, high aspect ratio cells with a small cell heights and coplanar thin electrodes can be analyzed to determine their current density distribution.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Case Western Reserve Univ., Cleveland, OH (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS) (SC-27)
OSTI Identifier:
1502547
Grant/Contract Number:  
AC05-00OR22725; SC0014664
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 166; Journal Issue: 4; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 42 ENGINEERING; 36 MATERIALS SCIENCE; Electroanalytical Electrochemistry; Electrodeposition; Electrodeposition - modeling; microelectrochemistry; nanoelectrochemistry; spectroelectrochemistry

Citation Formats

Stricker, Elizabeth A., Ke, Xinyou, Wainright, Jesse S., Unocic, Raymond R., and Savinell, Robert F. Current Density Distribution in Electrochemical Cells with Small Cell Heights and Coplanar Thin Electrodes as Used in ec-S/TEM Cell Geometries. United States: N. p., 2019. Web. doi:10.1149/2.0211904jes.
Stricker, Elizabeth A., Ke, Xinyou, Wainright, Jesse S., Unocic, Raymond R., & Savinell, Robert F. Current Density Distribution in Electrochemical Cells with Small Cell Heights and Coplanar Thin Electrodes as Used in ec-S/TEM Cell Geometries. United States. doi:10.1149/2.0211904jes.
Stricker, Elizabeth A., Ke, Xinyou, Wainright, Jesse S., Unocic, Raymond R., and Savinell, Robert F. Fri . "Current Density Distribution in Electrochemical Cells with Small Cell Heights and Coplanar Thin Electrodes as Used in ec-S/TEM Cell Geometries". United States. doi:10.1149/2.0211904jes. https://www.osti.gov/servlets/purl/1502547.
@article{osti_1502547,
title = {Current Density Distribution in Electrochemical Cells with Small Cell Heights and Coplanar Thin Electrodes as Used in ec-S/TEM Cell Geometries},
author = {Stricker, Elizabeth A. and Ke, Xinyou and Wainright, Jesse S. and Unocic, Raymond R. and Savinell, Robert F.},
abstractNote = {The electrochemical engineering aspects of high aspect ratio cells, such as those used in in situ electrochemical scanning transmission microscopy (ec-S/TEM) were examined, focusing on aspects that could cause non-uniform current distribution. Having a uniform current distribution across the working electrode is important for any spectroelectrochemical technique in order to provide accurate electrochemical information as well as structural electrolyte-electrode interface information. An analytical model was developed to determine current density distribution and a Wagner number was derived for a small cell height with coplanar electrodes. The main assumptions of this analysis are: 1) mass transport effects are negligible, 2) a uniform potential distribution in the direction of the cell height due to their small size, and 3) the working electrode potential is constant across its length. With our analysis, the assumptions were found to be reasonable. In addition, the effect of the conductivity and thickness of the thin film electrode and its potential effect on current density distribution have been analyzed. Now, with this work, high aspect ratio cells with a small cell heights and coplanar thin electrodes can be analyzed to determine their current density distribution.},
doi = {10.1149/2.0211904jes},
journal = {Journal of the Electrochemical Society},
number = 4,
volume = 166,
place = {United States},
year = {2019},
month = {2}
}

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