Type

Journal Article

Authors

Clivia M. Sotomayor Torres
Guillermo Gonzalez
Eglantina Benavente
Simon B. Newcomb
David A. Tanner
Vladimir Lavayen
Colm O'Dwyer

Subjects

Physics

Topics
batteries long range order nanotubes energy storage three dimensional intercalation high resolution vanadium oxide

Reduced surfactant uptake in three dimensional assemblies of VO(x) nanotubes improves reversible Li(+) intercalation and charge capacity (2009)

Abstract The relationship between the nanoscale structure of vanadium pentoxide nanotubes and their ability to accommodate Li+ during intercalation/deintercalation is explored. The nanotubes are synthesized using two different precursors through a surfactant-assisted templating method, resulting in standalone VOx (vanadium oxide) nanotubes and also “nano-urchin”. Under highly reducing conditions, where the interlaminar uptake of primary alkylamines is maximized, standalone nanotubes exhibit near-perfect scrolled layers and long-range structural order even at the molecular level. Under less reducing conditions, the degree of amine uptake is reduced due to a lower density of V4+ sites and less V2O5 is functionalized with adsorbed alkylammonium cations. This is typical of the nano-urchin structure. High-resolution TEM studies revealed the unique observation of nanometer-scale nanocrystals of pristine unreacted V2O5 throughout the length of the nanotubes in the nano-urchin. Electrochemical intercalation studies revealed that the very well ordered xerogel-based nanotubes exhibit similar specific capacities (235 mA h g −1) to Na+-exchange nanorolls of VOx (200 mA h g −1). By comparison, the theoretical maximum value is reported to be 240 mA h g −1. The VOTPP-based nanotubes of the nano-urchin 3D assemblies, however, exhibit useful charge capacities exceeding 437 mA h g −1, which is a considerable advance for VOx based nanomaterials and one of the highest known capacities for Li+ intercalated laminar vanadates.
Collections Ireland -> University College Cork -> Research Institutes and Centres
Ireland -> University College Cork -> Applied Nanoscience Group - Journal Articles
Ireland -> University College Cork -> Tyndall National Institute
Ireland -> University College Cork -> Applied Nanoscience Group
Ireland -> University College Cork -> Chemistry
Ireland -> University College Cork -> Chemistry - Journal Articles
Ireland -> University College Cork -> College of Science, Engineering and Food Science
Ireland -> University College Cork -> Micro-Nanoelectronics Centre

Full list of authors on original publication

Clivia M. Sotomayor Torres, Guillermo Gonzalez, Eglantina Benavente, Simon B. Newcomb, David A. Tanner, Vladimir Lavayen, Colm O'Dwyer

Experts in our system

1
D.A Tanner
University of Limerick
Total Publications: 45
 
2
Colm O'Dwyer
University College Cork
Total Publications: 121