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dc.contributor.authorLee, Kuang-Tsin
dc.contributor.authorLee, Jyh-Fu
dc.contributor.authorWu, Nae-Lih
dc.date.accessioned2016-02-25T13:13:22Z
dc.date.available2016-02-25T13:13:22Z
dc.date.issued2009-11
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.
dc.identifier.issn0013-4686
dc.identifier.doi10.1016/j.electacta.2009.05.065
dc.identifier.urihttp://hdl.handle.net/10754/598137
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.
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).
dc.publisherElsevier BV
dc.subjectGel polymer electrolyte
dc.subjectMnO2
dc.subjectPotassium polyacrylate
dc.subjectPotassium polyacrylate-co-polyacrylamide
dc.subjectSupercapacitor
dc.subjectX-ray absorption near-edge structure analysis
dc.titleElectrochemical characterizations on MnO2 supercapacitors with potassium polyacrylate and potassium polyacrylate-co-polyacrylamide gel polymer electrolytes
dc.typeArticle
dc.identifier.journalElectrochimica Acta
dc.contributor.institutionNational Taiwan University, Taipei, Taiwan
dc.contributor.institutionNational Synchrotron Radiation Research Center Taiwan, Hsin-chu, Taiwan
kaust.grant.numberKUK-C1-014-12


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