Probing porosity and pore interconnectivity in self-assembled TiO 2-graphene hybrid nanostructures using hyperpolarized 129Xe NMR

Li Qiong Wang, Donghai Wang, Jun Liu, Gregory J. Exarhos

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Hyperpolarized (HP) 129Xe NMR was used to probe the porosity and interconnectivity of pores in self-assembled hybrid TiO 2-graphene nanostructures. We have demonstrated that HP 129Xe NMR is a powerful technique in probing any changes in porosity and interconnectivity of the pores caused by the addition of a small amount of functionalized graphene sheets (FGSs) (1% weight percent) into the network of mesoporous TiO 2. To obtain the information on the changes in porosity and interconnectivity of the pores caused by the addition of a small amount of FGSs, a comparative study has been carried out by acquiring HP 129Xe NMR spectra under identical experimental conditions for both pure mesoporous TiO 2 and hybrid TiO 2-FGSs. The HP 129Xe NMR results from our comparative study suggest that TiO 2 and graphene are mixed uniformly on the nanoscale and the resulting hybrid nanostructure has better channel connectivity between different domains, enhancing the transport property for Li-insertion/extraction.

Original languageEnglish (US)
Pages (from-to)22-29
Number of pages8
JournalJournal of Physical Chemistry C
Volume116
Issue number1
DOIs
StatePublished - Jan 12 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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