Hashem, A. M. ; Abuzeid, H. M. ; Mikhailova, D. ; Ehrenberg, H. ; Mauger, A. ; Julien, C. M. (2012):
Structural and electrochemical properties of α-MnO2 doped with cobalt.
In: Journal of Materials Science, 47 (5), pp. 2479-2485. ISSN 0022-2461,
[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. ; Abuzeid, H. M. ; Mikhailova, D. ; Ehrenberg, H. ; Mauger, A. ; 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 |
| Journal 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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