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Structural and electrochemical properties of α-MnO2 doped with cobalt

Hashem, A. M. and Abuzeid, H. M. and Mikhailova, D. and Ehrenberg, H. and Mauger, A. and Julien, C. M. (2012):
Structural and electrochemical properties of α-MnO2 doped with cobalt.
In: Journal of Materials Science, pp. 2479-2485, 47, (5), ISSN 0022-2461, [Online-Edition: http://dx.doi.org/10.1007/s10853-011-6071-x],
[Article]

Abstract

In this study, co-doped and undoped MnO2 samples were prepared by redox reaction in acidic medium. X-ray diffraction patterns of pure and doped samples revealed that they crystallized in the α-form with a (2 × 2) tunnel structure. Chemical analysis indicated an increase in the concentration of K+ cations upon Co doping resulting in higher thermal stability. Magnetic properties show the coexistence of Mn4+ and Mn3+ valence states, with reduced amount of Mn3+ ions after the doping process. Co-doped MnO2 has better rechargeability and capacity retention than pure α-MnO2, but the reduction of the capacity fading occurs at the expense of the initial capacity.

Item Type: Article
Erschienen: 2012
Creators: Hashem, A. M. and Abuzeid, H. M. and Mikhailova, D. and Ehrenberg, H. and Mauger, A. and Julien, C. M.
Title: Structural and electrochemical properties of α-MnO2 doped with cobalt
Language: English
Abstract:

In this study, co-doped and undoped MnO2 samples were prepared by redox reaction in acidic medium. X-ray diffraction patterns of pure and doped samples revealed that they crystallized in the α-form with a (2 × 2) tunnel structure. Chemical analysis indicated an increase in the concentration of K+ cations upon Co doping resulting in higher thermal stability. Magnetic properties show the coexistence of Mn4+ and Mn3+ valence states, with reduced amount of Mn3+ ions after the doping process. Co-doped MnO2 has better rechargeability and capacity retention than pure α-MnO2, but the reduction of the capacity fading occurs at the expense of the initial capacity.

Journal or Publication Title: Journal of Materials Science
Volume: 47
Number: 5
Divisions: DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation > Subproject B4: In situ investigations of the degradation of intercalation batteries and their modelling
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 29 Feb 2012 14:27
Official URL: http://dx.doi.org/10.1007/s10853-011-6071-x
Additional Information:

SFB 595 B4

Identification Number: doi:10.1007/s10853-011-6071-x
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