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Open Access Nano Express

Fabrication of core/shell ZnWO4/carbon nanorods and their Li electroactivity

Hyun-Woo Shim1, Ah-Hyeon Lim1, Gwang-Hee Lee1, Hang-Chul Jung12 and Dong-Wan Kim1*

Author Affiliations

1 Department of Materials Science and Engineering, Ajou University, Suwon 443-749, South Korea

2 Plant Engineering Center, Institute of Advanced Engineering, Yongin 449-863, South Korea

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Nanoscale Research Letters 2012, 7:9  doi:10.1186/1556-276X-7-9

Published: 5 January 2012

Abstract

Carbon-coated ZnWO4 [C-ZW] nanorods with a one-dimensional core/shell structure were synthesised using hydrothermally prepared ZnWO4 and malic acid as precursors. The effects of the carbon coating on the ZnWO4 nanorods are investigated by thermogravimetry, high-resolution transmission electron microscopy, and Raman spectroscopy. The coating layer was found to be in uniform thickness of approximately 3 nm. Moreover, the D and G bands of carbon were clearly observed at around 1,350 and 1,600 cm-1, respectively, in the Raman spectra of the C-ZW nanorods. Furthermore, lithium electroactivities of the C-ZW nanorods were evaluated using cyclic voltammetry and galvanostatic cycling. In particular, the formed C-ZW nanorods exhibited excellent electrochemical performances, with rate capabilities better than those of bare ZnWO4 nanorods at different current rates, as well as a coulombic efficiency exceeding 98%. The specific capacity of the C-ZW nanorods maintained itself at approximately 170 mAh g-1, even at a high current rate of 3 C, which is much higher than pure ZnWO4 nanorods.