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Lookup NU author(s): Dr Stevin Pramana
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The structural and electrochemical properties of the mixed transition metallic oxides Zn1-xMnxFe2O4 nanofibers, which crystallize in a cubic spinel AFe2O4 structure, are investigated systematically with a gradual substitution of Zn by Mn. The crystal structural information studied by X-ray diffraction (XRD) depicts the formation of single phase spinel structure, while electron-dispersive X-ray spectroscopy (EDS) reveals the stoichiometric ratio between Zn and Mn. ZnFe2O4 exhibits a good capacity of ∼532 mAh g-1 at 50th cycle through the interbeneficial conversion reaction and alloy-dealloy mechanism, with a first discharge working voltage of ∼0.83 V. Subsequently, the characteristic redox potential of each spinel is gradually reduced with the replacement of Mn. Furthermore, Zn 0.3Mn0.7Fe2O4 demonstrates the highest capacity of ∼612 mA h g-1 at 50th cycle among the solid solution series. Ex situ characterization by high-resolution transmission electron microscope (TEM) and electron energy loss spectroscopy (EELS) is conducted to study the participation of Mn in the battery performance. This report represents an example of how the electrochemical performance could be flexibly adjusted by tuning the ratio of transition metals within the spinel. © 2013 American Chemical Society.
Author(s): Teh PF, Pramana SS, Sharma Y, Ko YW, Madhavi S
Publication type: Article
Publication status: Published
Journal: ACS Applied Materials and Interfaces
Print publication date: 26/06/2013
Online publication date: 20/05/2013
ISSN (print): 1944-8244
ISSN (electronic): 1944-8252
Publisher: American Chemical Society
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