Ag or Au Nanoparticle-Embedded One-Dimensional Composite TiO 2 Nanofibers Prepared via Electrospinning for Use in Lithium-Ion Batteries
2010; American Chemical Society; Volume: 2; Issue: 7 Linguagem: Inglês
10.1021/am100319u
ISSN1944-8252
AutoresSang Hoon Nam, Hee-Sang Shim, Youn-Su Kim, Mushtaq Ahmad Dar, Jong Guk Kim, Won Bae Kim,
Tópico(s)ZnO doping and properties
ResumoWe prepared metallic-nanoparticle-embedded one-dimensional titanium dioxide (1D-TiO2) via a one-step electrospinning process, in which Au or Ag metallic nanoparticles between 5 and 10 nm in diameter were incorporated within the TiO2 nanofibers. After calcination of the composite nanofibers at high temperature of 450 °C, the nanofibers were converted to 1D-TiO2 by the thermal decomposition of polyvinylpyrrolidone (PVP). This process simultaneously changed the metal precursors (AgNO3 or HAuCl4·3H2O) to metallic nanoparticles (Ag or Au) to produce 1D-TiO2 nanofiber composites (Ag@1D-TiO2 or Au@1D-TiO2). The influences of Ag or Au incorporation into the 1D-TiO2 nanofibers were studied using various microscopic and X-ray spectroscopic methods. Because of the changes in crystallinity and size of TiO2 in the Ag@1D-TiO2 and Au@1D-TiO2 nanostructures, lithium-ion diffusion and charge transfer were promoted. In particular, in comparison to pristine 1D-TiO2, the specific capacity of metal nanoparticle-embedded 1D-TiO2 nanofiber composites was increased by at least 20%, and the rate performance was improved 2-fold. Consequently, we propose that these metal-nanoparticle-embedded 1D-nanostructures prepared via electrospinning may be useful as electrodes in lithium-ion batteries.
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