Hydrothermal synthesis of cubic a-Fe2O3 microparticles using glycine: Surfacecharacterization, reaction mechanism and electrochemical activity
Date
2011
Authors
Yin, C.
Minakshi, M.
Ralph, D.
Jiang, Z.
Xie, Z.
Guo, H.
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Journal article
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Journal of Alloys and Compounds, 2011; 509(41):9821-9825
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Chun-Yang Yina, Manickam Minakshi, David E. Ralph, Zhong-Tao Jiang, Zonghan Xie, Hua Guo
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Abstract
Cubic α-Fe<inf>2</inf>O<inf>3</inf> (hematite) microparticles (side lengths = 0.3-1.3 μm) have been synthesized using glycine and ferric chloride via a simple one-step hydrothermal reaction. Their morphological, mineralogical and surface properties have been determined using scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). XRD analysis indicated that the synthesized α-Fe<inf>2</inf>O<inf>3</inf> microparticles were minerallogically pure. An increase in hydrothermal reaction duration from 10 to 24 h increased the atomic percentages of α-Fe<inf>2</inf>O<inf>3</inf> on the surface of the microparticles by almost 8%. The mechanism concerning reactions of species to produce this microparticles precipitate was elucidated based on thermodynamics and ionic equilibrium aspects. In the electrochemical analysis, the synthesized α-Fe<inf>2</inf>O<inf>3</inf> microparticles (as cathode material) exhibit an approximate charge capacity of 160 mAh/g and excellent coulombic efficiency of 94%. © 2011 Elsevier B.V.
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© 2011 Elsevier B.V. All rights reserved.