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Title: Electrochemical Transport Phenomena in Hybrid Pseudocapacitors under Galvanostatic Cycling

Abstract

Here, this study aims to provide insights into the electrochemical transport and interfacial phenomena in hybrid pseudocapacitors under galvanostatic cycling. Pseudocapacitors are promising electrical energy storage devices for applications requiring large power density. They also involve complex, coupled, and multiscale physical phenomena that are difficult to probe experimentally. The present study performed detailed numerical simulations for a hybrid pseudocapacitor with planar electrodes and binary, asymmetric electrolyte under various cycling conditions, based on a first-principles continuum model accounting simultaneously for charge storage by electric double layer (EDL) formation and by faradaic reactions with intercalation. Two asymptotic regimes were identified corresponding to (i) dominant faradaic charge storage at low current and low frequency or (ii) dominant EDL charge storage at high current and high frequency. Analytical expressions for the intercalated ion concentration and surface overpotential were derived for both asymptotic regimes. Features of typical experimentally measured cell potential were physically interpreted. These insights could guide the optimization of hybrid pseudocapacitors.

Authors:
 [1];  [1];  [1];  [1]
  1. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC), Washington, D.C. (United States). Molecularly Engineered Energy Materials (MEEM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1370222
Grant/Contract Number:  
SC0001342
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 163; Journal Issue: 2; Related Information: MEEM partners with University of California, Los Angeles (lead); University of California, Berkeley; Eastern Washington University; University of Kansas; National Renewable Energy Laboratory; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; energy storage; intercalation; pseudocapacitors; supercapacitors

Citation Formats

d'Entremont, Anna L., Girard, Henri -Louis, Wang, Hainan, and Pilon, Laurent. Electrochemical Transport Phenomena in Hybrid Pseudocapacitors under Galvanostatic Cycling. United States: N. p., 2015. Web. doi:10.1149/2.0441602jes.
d'Entremont, Anna L., Girard, Henri -Louis, Wang, Hainan, & Pilon, Laurent. Electrochemical Transport Phenomena in Hybrid Pseudocapacitors under Galvanostatic Cycling. United States. doi:10.1149/2.0441602jes.
d'Entremont, Anna L., Girard, Henri -Louis, Wang, Hainan, and Pilon, Laurent. Wed . "Electrochemical Transport Phenomena in Hybrid Pseudocapacitors under Galvanostatic Cycling". United States. doi:10.1149/2.0441602jes. https://www.osti.gov/servlets/purl/1370222.
@article{osti_1370222,
title = {Electrochemical Transport Phenomena in Hybrid Pseudocapacitors under Galvanostatic Cycling},
author = {d'Entremont, Anna L. and Girard, Henri -Louis and Wang, Hainan and Pilon, Laurent},
abstractNote = {Here, this study aims to provide insights into the electrochemical transport and interfacial phenomena in hybrid pseudocapacitors under galvanostatic cycling. Pseudocapacitors are promising electrical energy storage devices for applications requiring large power density. They also involve complex, coupled, and multiscale physical phenomena that are difficult to probe experimentally. The present study performed detailed numerical simulations for a hybrid pseudocapacitor with planar electrodes and binary, asymmetric electrolyte under various cycling conditions, based on a first-principles continuum model accounting simultaneously for charge storage by electric double layer (EDL) formation and by faradaic reactions with intercalation. Two asymptotic regimes were identified corresponding to (i) dominant faradaic charge storage at low current and low frequency or (ii) dominant EDL charge storage at high current and high frequency. Analytical expressions for the intercalated ion concentration and surface overpotential were derived for both asymptotic regimes. Features of typical experimentally measured cell potential were physically interpreted. These insights could guide the optimization of hybrid pseudocapacitors.},
doi = {10.1149/2.0441602jes},
journal = {Journal of the Electrochemical Society},
number = 2,
volume = 163,
place = {United States},
year = {2015},
month = {11}
}

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Cited by: 8 works
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Works referenced in this record:

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