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

Journal
Materials Chemistry and Physics
Journal Volume
130
Journal Issue
1-2
Pages
367-372
Date Issued
2011
Author(s)
Lin Y.-P.
Tsai C.-B.
Ho W.-H.
Wu N.-L.  
DOI
10.1016/j.matchemphys.2011.06.050
URI
https://scholars.lib.ntu.edu.tw/handle/123456789/409002
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-80052577161&doi=10.1016%2fj.matchemphys.2011.06.050&partnerID=40&md5=839d2132db131053b251bade07b008c4
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 ¢XC 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.
Subjects
Chemical synthesis
Composite materials
Nanostructures
Supercapacitor
Type
journal article

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