Solid-state NMR study of ion-exchange processes in V2O5 xerogel, polyaniline/V2O5, and sulfonated polyaniline/V2O5 nanocomposites

G. P. Holland, Jeffery Yarger, Daniel Buttry, F. Huguenin, R. M. Torresi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The local lithium environment in electrochemically lithiated V2O5 xerogel, polyaniline/V2O5, and sulfonated polyaniline/V2O5 nanocomposites is probed with solid-state 7Li static and magic angle spinning (MAS) nuclear magnetic resonance (NMR). The line width from the static NMR spectra reveals differences between the lithium environments in the three materials. The MAS NMR spectrum of the V2O5 parent material in its unreduced (as-prepared) state shows the presence of an intrinsic ion-exchange site that can be populated with Li+ by simple exposure to LiCiO4 in propylene carbonate (PC). Following electrochemical lithiation, both ion-exchange and intercalated lithium sites are observed. After lithiation, Li+ ions at the ion-exchange site can be displaced by exposure to NaClO4 in PC via a simple ion-exchange process. Both the ion-exchange and intercalated sites are observed for a sulfonated polyaniline/V2O5 nanocomposite while the polyaniline/V2O5 nanocomposite response is dominated by the intercalated lithium site. The results show that charge compensation of the intrinsic negatively charged ion-exchange sites in the V2O5 xerogel by conducting polymers used to form the nanocomposites is important in determining the number and type of Li+ sites available.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume150
Issue number12
DOIs
StatePublished - Dec 2003
Externally publishedYes

Fingerprint

Xerogels
xerogels
Polyaniline
Ion exchange
Nanocomposites
nanocomposites
Nuclear magnetic resonance
solid state
nuclear magnetic resonance
Lithium
lithium
ions
Magic angle spinning
Propylene
propylene
Carbonates
metal spinning
carbonates
Conducting polymers
Linewidth

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

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title = "Solid-state NMR study of ion-exchange processes in V2O5 xerogel, polyaniline/V2O5, and sulfonated polyaniline/V2O5 nanocomposites",
abstract = "The local lithium environment in electrochemically lithiated V2O5 xerogel, polyaniline/V2O5, and sulfonated polyaniline/V2O5 nanocomposites is probed with solid-state 7Li static and magic angle spinning (MAS) nuclear magnetic resonance (NMR). The line width from the static NMR spectra reveals differences between the lithium environments in the three materials. The MAS NMR spectrum of the V2O5 parent material in its unreduced (as-prepared) state shows the presence of an intrinsic ion-exchange site that can be populated with Li+ by simple exposure to LiCiO4 in propylene carbonate (PC). Following electrochemical lithiation, both ion-exchange and intercalated lithium sites are observed. After lithiation, Li+ ions at the ion-exchange site can be displaced by exposure to NaClO4 in PC via a simple ion-exchange process. Both the ion-exchange and intercalated sites are observed for a sulfonated polyaniline/V2O5 nanocomposite while the polyaniline/V2O5 nanocomposite response is dominated by the intercalated lithium site. The results show that charge compensation of the intrinsic negatively charged ion-exchange sites in the V2O5 xerogel by conducting polymers used to form the nanocomposites is important in determining the number and type of Li+ sites available.",
author = "Holland, {G. P.} and Jeffery Yarger and Daniel Buttry and F. Huguenin and Torresi, {R. M.}",
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T1 - Solid-state NMR study of ion-exchange processes in V2O5 xerogel, polyaniline/V2O5, and sulfonated polyaniline/V2O5 nanocomposites

AU - Holland, G. P.

AU - Yarger, Jeffery

AU - Buttry, Daniel

AU - Huguenin, F.

AU - Torresi, R. M.

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