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Effects of vanadium- and iron-doping on crystal morphology and electrochemical properties of 1D nanostructured manganese oxides

Title
Effects of vanadium- and iron-doping on crystal morphology and electrochemical properties of 1D nanostructured manganese oxides
Authors
Yoo H.N.Park D.H.Hwang S.-J.
Ewha Authors
황성주
SCOPUS Author ID
황성주scopus
Issue Date
2008
Journal Title
Journal of Power Sources
ISSN
0378-7753JCR Link
Citation
vol. 185, no. 2, pp. 1374 - 1379
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
One-dimensional (1D) nanostructures of vanadium- and iron-doped manganese oxides, Mn1-xMxO2 (M = V and Fe), are synthesized via one-pot hydrothermal reactions. The results of X-ray diffraction studies and electron microscopic analyses demonstrate that all the present 1D nanostructured materials possess α-MnO2-type structure. While the vanadium dopants produce 1D nanorods with a smaller aspect ratio of ∼3-5, iron dopants produce 1D nanowires with a high aspect ratio of >20. X-ray absorption spectroscopy clearly shows that the dopant vanadium ions are stabilized in tetravalent oxidation state with distorted octahedral symmetry, while the iron ions are stabilized in trivalent oxidation state with regular octahedral symmetry. Significant local structural distortion and size mismatch of dopant vanadium ions are responsible for the low aspect ratio of the vanadium-doped nanorods through the less effective growth of a 1D nanostructure. According to electrochemical measurements, doping with Fe and V can improve the electrode performance of 1D nanostructured manganate and such a positive effect is much more prominent for the iron dopant. The present study clearly indicates that doping with Fe and V provides an effective way of tailoring the crystal dimension and electrochemical properties of 1D nanostructured manganese oxides. © 2008 Elsevier B.V. All rights reserved.
DOI
10.1016/j.jpowsour.2008.08.085
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자연과학대학 > 화학·나노과학전공 > Journal papers
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