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

Hyun Woo Shim, Ah Hyeon Lim, Gwang Hee Lee, Hang Chul Jung, Dong-Wan Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Carbon-coated ZnWO 4 [C-ZW] nanorods with a one-dimensional core/shell structure were synthesised using hydrothermally prepared ZnWO 4 and malic acid as precursors. The effects of the carbon coating on the ZnWO 4 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 ZnWO 4 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 ZnWO 4 nanorods.

Original languageEnglish
Article number9
Pages (from-to)1-13
Number of pages13
JournalNanoscale Research Letters
Volume7
DOIs
Publication statusPublished - 2012 Jan 25
Externally publishedYes

Fingerprint

Nanorods
nanorods
Carbon
Fabrication
fabrication
carbon
coatings
Coatings
High resolution transmission electron microscopy
thermogravimetry
Lithium
Cyclic voltammetry
high current
Raman spectroscopy
Thermogravimetric analysis
Raman scattering
lithium
Raman spectra
transmission electron microscopy
cycles

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Fabrication of core/shell ZnWO4/carbon nanorods and their Li electroactivity. / Shim, Hyun Woo; Lim, Ah Hyeon; Lee, Gwang Hee; Jung, Hang Chul; Kim, Dong-Wan.

In: Nanoscale Research Letters, Vol. 7, 9, 25.01.2012, p. 1-13.

Research output: Contribution to journalArticle

Shim, Hyun Woo ; Lim, Ah Hyeon ; Lee, Gwang Hee ; Jung, Hang Chul ; Kim, Dong-Wan. / Fabrication of core/shell ZnWO4/carbon nanorods and their Li electroactivity. In: Nanoscale Research Letters. 2012 ; Vol. 7. pp. 1-13.
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