Probing Porosity and Pore Interconnectivity in Crystalline Mesoporous TiO2 Using Hyperpolarized Xe-129 NMR

Journal Article · Thu Apr 23 04:00:00 EDT 2009 · Journal of Physical Chemistry C, 113(16):6577-6583

DOI:https://doi.org/10.1021/jp809740e· OSTI ID:965140

Wang, Li Q; Wang, Donghai; Liu, Jun; Exarhos, Gregory J; Pawsey, Shane; Moudrakovski, I L

Hyperpolarized (HP) 129Xe NMR was used to probe the porosity and interconnectivity of pores in crystalline mesoporous TiO2. We have demonstrated that HP 129Xe NMR can be used to differentiate between similar sized pores within different crystalline phases. Pores of 4 nm size resident in mixed anatase and rutile mesoporous TiO2 phases were identified. Complementary to other techniques, HP 129Xe NMR is able to probe the interconnectivity between pores present in these different phases. The cross peaks in 2D exchange (EXSY) NMR spectra between the signals of xenon in two types of pores on millisecond time scale are clearly visible, indicating substantial pore interconnectivity. Information on porosity and interconnectivity is critical for understanding Li ion transport mechanisms in mesoporous TiO2 anode materials.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 965140
• Report Number(s): PNNL-SA-62597; 30406; KC0201050
• Journal Information: Journal of Physical Chemistry C, 113(16):6577-6583, Journal Name: Journal of Physical Chemistry C, 113(16):6577-6583 Journal Issue: 16 Vol. 113; ISSN 1932-7447
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Environmental Molecular Sciences Laboratory
NMR SPECTRA
PORE STRUCTURE
POROSITY
TITANIUM OXIDES
XENON 129