Comparative study on nanostructured MnO2/carbon composites synthesized by spontaneous reduction for supercapacitor application

Handle URI:
http://hdl.handle.net/10754/597806
Title:
Comparative study on nanostructured MnO2/carbon composites synthesized by spontaneous reduction for supercapacitor application
Authors:
Lin, Yen-Po; Tsai, Chung-Bo; Ho, Wen-Hsien; Wu, Nae-Lih
Abstract:
MnO2 has been deposited onto two types of carbon (C) substrates, including a non-porous multi-wall carbon nano-tube (CNT) and a porous carbon black (CB) powder, by a solution reduction process where MnO4 - was reduced at 80 °C by the C substrate so as to give nano-crystalline MnO2 directly at the C surface. The nature of the C substrate has profound effects on polymorphicity, microstructure and electrochemical properties, in terms of supercapacitor application, of the resulting oxide. Deposition on CNT produces meso/macro-porous layer containing predominantly spinel MnO2 strongly bonded to the CNTs and having a larger surface area, while that on CB results in birnessite granules with a lower surface area. In addition to having a higher specific capacitance (309 F g-1), the MnO2/CNT electrode exhibits superior power performance (221 F g-1 at 500 mV s-1 or ca. 20 Wh kg -1at 88 kW kg-1) to MnO2/CB due to reduced electronic and ion-diffusion resistances. Furthermore, the MnO2/CNT electrode also exhibits slower self-discharging rate and greater cycling stability. The results indicate that the MnO2 spinel/CNT holds promise for supercapacitor applications. © 2011 Elsevier B.V. All rights reserved.
Citation:
Lin Y-P, Tsai C-B, Ho W-H, Wu N-L (2011) Comparative study on nanostructured MnO2/carbon composites synthesized by spontaneous reduction for supercapacitor application. Materials Chemistry and Physics 130: 367–372. Available: http://dx.doi.org/10.1016/j.matchemphys.2011.06.050.
Publisher:
Elsevier BV
Journal:
Materials Chemistry and Physics
KAUST Grant Number:
KUK-C1-014-12
Issue Date:
Oct-2011
DOI:
10.1016/j.matchemphys.2011.06.050
Type:
Article
ISSN:
0254-0584
Sponsors:
This work is partially supported by Taiwan Textile Research Institute, by National Science Council, Taiwan, ROC (NSC 98-2221-E-002-084-MY3 and 98-3114-E-007-011), and by King Abdullah University of Science and Technology (KAUST) under the GRP Award (award no. KUK-C1-014-12).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorLin, Yen-Poen
dc.contributor.authorTsai, Chung-Boen
dc.contributor.authorHo, Wen-Hsienen
dc.contributor.authorWu, Nae-Lihen
dc.date.accessioned2016-02-25T12:57:02Zen
dc.date.available2016-02-25T12:57:02Zen
dc.date.issued2011-10en
dc.identifier.citationLin Y-P, Tsai C-B, Ho W-H, Wu N-L (2011) Comparative study on nanostructured MnO2/carbon composites synthesized by spontaneous reduction for supercapacitor application. Materials Chemistry and Physics 130: 367–372. Available: http://dx.doi.org/10.1016/j.matchemphys.2011.06.050.en
dc.identifier.issn0254-0584en
dc.identifier.doi10.1016/j.matchemphys.2011.06.050en
dc.identifier.urihttp://hdl.handle.net/10754/597806en
dc.description.abstractMnO2 has been deposited onto two types of carbon (C) substrates, including a non-porous multi-wall carbon nano-tube (CNT) and a porous carbon black (CB) powder, by a solution reduction process where MnO4 - was reduced at 80 °C by the C substrate so as to give nano-crystalline MnO2 directly at the C surface. The nature of the C substrate has profound effects on polymorphicity, microstructure and electrochemical properties, in terms of supercapacitor application, of the resulting oxide. Deposition on CNT produces meso/macro-porous layer containing predominantly spinel MnO2 strongly bonded to the CNTs and having a larger surface area, while that on CB results in birnessite granules with a lower surface area. In addition to having a higher specific capacitance (309 F g-1), the MnO2/CNT electrode exhibits superior power performance (221 F g-1 at 500 mV s-1 or ca. 20 Wh kg -1at 88 kW kg-1) to MnO2/CB due to reduced electronic and ion-diffusion resistances. Furthermore, the MnO2/CNT electrode also exhibits slower self-discharging rate and greater cycling stability. The results indicate that the MnO2 spinel/CNT holds promise for supercapacitor applications. © 2011 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipThis work is partially supported by Taiwan Textile Research Institute, by National Science Council, Taiwan, ROC (NSC 98-2221-E-002-084-MY3 and 98-3114-E-007-011), and by King Abdullah University of Science and Technology (KAUST) under the GRP Award (award no. KUK-C1-014-12).en
dc.publisherElsevier BVen
dc.subjectChemical synthesisen
dc.subjectComposite materialsen
dc.subjectNanostructuresen
dc.subjectSupercapacitoren
dc.titleComparative study on nanostructured MnO2/carbon composites synthesized by spontaneous reduction for supercapacitor applicationen
dc.typeArticleen
dc.identifier.journalMaterials Chemistry and Physicsen
dc.contributor.institutionNational Taiwan University, Taipei, Taiwanen
dc.contributor.institutionTaiwan Textile Research Institute, Taipei, Taiwanen
kaust.grant.numberKUK-C1-014-12en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.