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Title: Preparation and electrochemical studies of electrospun TiO2 nanofibers and molten salt method nanoparticles
Authors: Reddy, M.V. 
Jose, R. 
Teng, T.H.
Chowdari, B.V.R. 
Ramakrishna, S. 
Keywords: Electrochemical properties
Lithium batteries
Molten salt method
Titanium dioxide
Issue Date: 30-Mar-2010
Citation: Reddy, M.V., Jose, R., Teng, T.H., Chowdari, B.V.R., Ramakrishna, S. (2010-03-30). Preparation and electrochemical studies of electrospun TiO2 nanofibers and molten salt method nanoparticles. Electrochimica Acta 55 (9) : 3109-3117. ScholarBank@NUS Repository.
Abstract: The TiO2 nanofibers and nanoparticles are prepared by electrospinning and molten salt method, respectively. The materials are characterized by X-ray diffraction scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and a thermal analysis. The SEM and TEM studies showed that fibers were of average diameter ∼100 nm and composed of nanocrystallites of size 10-20 nm. Electrochemical properties of the materials are evaluated using cyclic voltammetry, galvanostatic cycling and electrochemical impedance spectroscopy. Cyclic voltammetric studies show a hysteresis (ΔV) between the cathodic and the anodic peak potentials for TiO2 nanofibers and nanoparticles (sizes ∼15-30 nm) are in the range, 0.23-0.30 V and a redox couple Ti4+/3+ around ∼1.74/2.0 V. Electrochemical cycling results revealed that the TiO2 nanofibers have lower capacity fading compared to that of the nanoparticles. The capacity fading for 2-50 cycles was ∼23% for nanofibers, which was nearly one-third of that of corresponding nanoparticles (∼63%). We discussed the effect of particle size on hysteresis and cycling performance of TiO2 nanoparticles. Impedance analysis of TiO2 nanofibers and nanoparticles during first discharge cycle is analyzed and interpreted. © 2010 Elsevier Ltd. All rights reserved.
Source Title: Electrochimica Acta
ISSN: 00134686
DOI: 10.1016/j.electacta.2009.12.095
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