Long-Term Charge/Discharge Cycling Stability of MnO2 Aqueous Supercapacitor under Positive Polarization

Handle URI:
http://hdl.handle.net/10754/598231
Title:
Long-Term Charge/Discharge Cycling Stability of MnO2 Aqueous Supercapacitor under Positive Polarization
Authors:
Ataherian, Fatemeh; Wu, Nae-Lih
Abstract:
The long-term charge/discharge cycling stability of MnO 2 electrode under positive polarization in aqueous KCl electrolyte has been studied over different potential windows spanning from the open circuit potential to varied higher-end potential limited by O 2 evolution. Cycling up to 1.2 V (vs Ag/AgCl (aq)) causes partial (35) capacitance fading to a plateau value within the initial cycles, accompanied by morphological reconstruction, reduction of surface Mn ions and oxygen evolution. The surface Mn-ion reduction has been attributed to a two-step oxidation-reduction mechanism involving OH oxidation in electrolyte, based on electrochemical analysis. When cycling potential extends to 1.4 V, extensive oxygen evolution takes place. The combination of surface passivation of current collector and extensive gas bubbling, which deteriorates electrical contact among the constituent particles within the electrode, results in further monotonic capacitance reduction. © 2011 The Electrochemical Society.
Citation:
Ataherian F, Wu N-L (2011) Long-Term Charge/Discharge Cycling Stability of MnO2 Aqueous Supercapacitor under Positive Polarization. J Electrochem Soc 158: A422. Available: http://dx.doi.org/10.1149/1.3555469.
Publisher:
The Electrochemical Society
Journal:
Journal of The Electrochemical Society
KAUST Grant Number:
KUK-C1-014-12
Issue Date:
2011
DOI:
10.1149/1.3555469
Type:
Article
ISSN:
0013-4651
Sponsors:
This work is partially supported by the National Science Council of Taiwan (NSC 98- 2221-E-002-084-MY3; 98-3114-E-007-011), by National Taiwan University (NTU98R0066-09), and by King Abdullah University of Science and Technology under the GRP Award (award No. KUK-C1-014-12). One of the authors, F.A., would like to thank NTU post-doctor fellowship (NTU99R40044).
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Full metadata record

DC FieldValue Language
dc.contributor.authorAtaherian, Fatemehen
dc.contributor.authorWu, Nae-Lihen
dc.date.accessioned2016-02-25T13:40:04Zen
dc.date.available2016-02-25T13:40:04Zen
dc.date.issued2011en
dc.identifier.citationAtaherian F, Wu N-L (2011) Long-Term Charge/Discharge Cycling Stability of MnO2 Aqueous Supercapacitor under Positive Polarization. J Electrochem Soc 158: A422. Available: http://dx.doi.org/10.1149/1.3555469.en
dc.identifier.issn0013-4651en
dc.identifier.doi10.1149/1.3555469en
dc.identifier.urihttp://hdl.handle.net/10754/598231en
dc.description.abstractThe long-term charge/discharge cycling stability of MnO 2 electrode under positive polarization in aqueous KCl electrolyte has been studied over different potential windows spanning from the open circuit potential to varied higher-end potential limited by O 2 evolution. Cycling up to 1.2 V (vs Ag/AgCl (aq)) causes partial (35) capacitance fading to a plateau value within the initial cycles, accompanied by morphological reconstruction, reduction of surface Mn ions and oxygen evolution. The surface Mn-ion reduction has been attributed to a two-step oxidation-reduction mechanism involving OH oxidation in electrolyte, based on electrochemical analysis. When cycling potential extends to 1.4 V, extensive oxygen evolution takes place. The combination of surface passivation of current collector and extensive gas bubbling, which deteriorates electrical contact among the constituent particles within the electrode, results in further monotonic capacitance reduction. © 2011 The Electrochemical Society.en
dc.description.sponsorshipThis work is partially supported by the National Science Council of Taiwan (NSC 98- 2221-E-002-084-MY3; 98-3114-E-007-011), by National Taiwan University (NTU98R0066-09), and by King Abdullah University of Science and Technology under the GRP Award (award No. KUK-C1-014-12). One of the authors, F.A., would like to thank NTU post-doctor fellowship (NTU99R40044).en
dc.publisherThe Electrochemical Societyen
dc.titleLong-Term Charge/Discharge Cycling Stability of MnO2 Aqueous Supercapacitor under Positive Polarizationen
dc.typeArticleen
dc.identifier.journalJournal of The Electrochemical Societyen
dc.contributor.institutionNational Taiwan University, Taipei, Taiwanen
kaust.grant.numberKUK-C1-014-12en
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