Electrochemical characterizations on MnO2 supercapacitors with potassium polyacrylate and potassium polyacrylate-co-polyacrylamide gel polymer electrolytes

Handle URI:
http://hdl.handle.net/10754/598137
Title:
Electrochemical characterizations on MnO2 supercapacitors with potassium polyacrylate and potassium polyacrylate-co-polyacrylamide gel polymer electrolytes
Authors:
Lee, Kuang-Tsin; Lee, Jyh-Fu; Wu, Nae-Lih
Abstract:
MnO2·nH2O supercapacitors with potassium polyacrylate (PAAK) and potassium polyacrylate-co-polyacrylamide (PAAK-co-PAAM) gel polymer electrolytes (GPEs) having the weight compositions of polymer:KCl:H2O = 9%:6.7%:84.3% have been characterized for their electrochemical performance. Compared with the liquid electrolyte (LE) counterpart, the GPE cells exhibit remarkable (∼50-130%) enhancement in specific capacitance of the oxide electrode, and the extent of the enhancement increases with increasing amount of the carboxylate groups in the polymers as well as with increasing oxide/electrolyte interfacial area. In situ X-ray absorption near-edge structure (XANES) analysis indicates that the oxide electrodes of the GPE cells possess higher Mn-ion valences and are subjected to greater extent of valence variation than that of the LE cell upon charging/discharging over the same potential range. Copolymerization of PAAK with PAAM greatly improves the cycling stability of the MnO2·nH2O electrode, and the improvement is attributable to the alkaline nature of the amino groups. Both GPEs exhibit ionic conductivities greater than 1.0 × 10-1 S cm-1 and are promising for high-rate applications. © 2009 Elsevier Ltd. All rights reserved.
Citation:
Lee K-T, Lee J-F, Wu N-L (2009) Electrochemical characterizations on MnO2 supercapacitors with potassium polyacrylate and potassium polyacrylate-co-polyacrylamide gel polymer electrolytes. Electrochimica Acta 54: 6148–6153. Available: http://dx.doi.org/10.1016/j.electacta.2009.05.065.
Publisher:
Elsevier BV
Journal:
Electrochimica Acta
KAUST Grant Number:
KUK-C1-014-12
Issue Date:
Nov-2009
DOI:
10.1016/j.electacta.2009.05.065
Type:
Article
ISSN:
0013-4686
Sponsors:
This work is partially supported by King Abdullah University of Science and Technology (KAUST) under the GRP Award (award No. KUK-C1-014-12) and by National Taiwan University (97R0066-09).
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Full metadata record

DC FieldValue Language
dc.contributor.authorLee, Kuang-Tsinen
dc.contributor.authorLee, Jyh-Fuen
dc.contributor.authorWu, Nae-Lihen
dc.date.accessioned2016-02-25T13:13:22Zen
dc.date.available2016-02-25T13:13:22Zen
dc.date.issued2009-11en
dc.identifier.citationLee K-T, Lee J-F, Wu N-L (2009) Electrochemical characterizations on MnO2 supercapacitors with potassium polyacrylate and potassium polyacrylate-co-polyacrylamide gel polymer electrolytes. Electrochimica Acta 54: 6148–6153. Available: http://dx.doi.org/10.1016/j.electacta.2009.05.065.en
dc.identifier.issn0013-4686en
dc.identifier.doi10.1016/j.electacta.2009.05.065en
dc.identifier.urihttp://hdl.handle.net/10754/598137en
dc.description.abstractMnO2·nH2O supercapacitors with potassium polyacrylate (PAAK) and potassium polyacrylate-co-polyacrylamide (PAAK-co-PAAM) gel polymer electrolytes (GPEs) having the weight compositions of polymer:KCl:H2O = 9%:6.7%:84.3% have been characterized for their electrochemical performance. Compared with the liquid electrolyte (LE) counterpart, the GPE cells exhibit remarkable (∼50-130%) enhancement in specific capacitance of the oxide electrode, and the extent of the enhancement increases with increasing amount of the carboxylate groups in the polymers as well as with increasing oxide/electrolyte interfacial area. In situ X-ray absorption near-edge structure (XANES) analysis indicates that the oxide electrodes of the GPE cells possess higher Mn-ion valences and are subjected to greater extent of valence variation than that of the LE cell upon charging/discharging over the same potential range. Copolymerization of PAAK with PAAM greatly improves the cycling stability of the MnO2·nH2O electrode, and the improvement is attributable to the alkaline nature of the amino groups. Both GPEs exhibit ionic conductivities greater than 1.0 × 10-1 S cm-1 and are promising for high-rate applications. © 2009 Elsevier Ltd. All rights reserved.en
dc.description.sponsorshipThis work is partially supported by King Abdullah University of Science and Technology (KAUST) under the GRP Award (award No. KUK-C1-014-12) and by National Taiwan University (97R0066-09).en
dc.publisherElsevier BVen
dc.subjectGel polymer electrolyteen
dc.subjectMnO2en
dc.subjectPotassium polyacrylateen
dc.subjectPotassium polyacrylate-co-polyacrylamideen
dc.subjectSupercapacitoren
dc.subjectX-ray absorption near-edge structure analysisen
dc.titleElectrochemical characterizations on MnO2 supercapacitors with potassium polyacrylate and potassium polyacrylate-co-polyacrylamide gel polymer electrolytesen
dc.typeArticleen
dc.identifier.journalElectrochimica Actaen
dc.contributor.institutionNational Taiwan University, Taipei, Taiwanen
dc.contributor.institutionNational Synchrotron Radiation Research Center Taiwan, Hsin-chu, Taiwanen
kaust.grant.numberKUK-C1-014-12en
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