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Royal Society of Chemistry, Journal of Materials Chemistry A: materials for energy and sustainability, 40(1), p. 12568

DOI: 10.1039/c3ta12652h

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Carbon nanocage supported synthesis of V2O5 nanorods and V2O5/TiO2 nanocomposites for Li-ion batteries

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This paper is available in a repository.

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Abstract

We present the facile synthesis of crystalline V2O5 nanorods and V2O5/TiO2 nanocomposites structures by a carbon nanocage (CNC)-assisted growth process, using vanadium triisopropoxide oxide and titanium isopropoxide precursors in air at 500 [degree]C. The diameters of the resultant V2O5 nanorods ranged between [similar]10 and 70 nm, while the crystalline V2O5/TiO2 nanocomposite structures adopted a unique morphology, due to both crystallisation and templating processes, with V2O5 adopting small-diameter nanowire and nanorod morphologies surrounded by sub-30 nm TiO2 nanoparticles. The V2O5 nanorods and V2O5/TiO2 nanocomposites were characterised by electron microscopy and X-ray diffraction techniques and subsequently reviewed as positive Li-ion electrodes. The phase-pure V2O5 nanorod structures exhibited appreciable Li+ storage properties over the potential range of 2.0-4.0 V vs. Li/Li+, displaying capacities of up to 288 mA h g-1 with appreciable cyclic behaviour at test rates of up to [similar]1 C. The crystalline V2O5/TiO2 nanocomposite structures displayed similar Li+ storage properties, however, increasing molar fractions of TiO2 led to a decline in the overall capacity versus the single-phase V2O5 counterparts. Interestingly, the Li+ insertion behaviour of the V2O5/TiO2 nanocomposite displayed character more-typical of amorphous V2O5, which was ascribed to a structural buffering effect of the inactive TiO2 phase. ; Science Foundation Ireland (07/SRC/I1172); Science Foundation Ireland (08/CE/I1432); Science Foundation Ireland (09/SIRG/I1621);Higher Education Authority (Program for Research in Third Level Institutions (2007-2011) via the INSPIRE)