Probing Porosity and Pore Interconnectivity in Self-Assembled TiO2–Graphene Hybrid Nanostructures Using Hyperpolarized 129Xe NMR
Hyperpolarized (HP) {sup 129}Xe NMR was used to probe the porosity and interconnectivity of pores in self-assembled hybrid TiO{sub 2}-graphene nanostructures. We have demonstrated that HP {sup 129}Xe NMR is a powerful technique in probing any changes in porosity and interconnectivity of the pores caused by addition of a small amount of functionalized graphene sheets (FGSs) (1% weight percent) into the network of mesoporous TiO{sub 2}. To obtain the information on the changes in porosity and interconnectivity of the pores caused by addition of a small amount of FGSs, a comparative study has been carried out by acquiring HP {sup 129}Xe NMR spectra under identical experimental conditions for both pure mesoporous TiO{sub 2} and hybrid TiO{sub 2}-FGSs. The HP {sup 129}Xe NMR results from our comparative study suggest that TiO{sub 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.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1036072
- Report Number(s):
- PNNL-SA-78124; KC0201050; TRN: US201205%%589
- Journal Information:
- Journal of Physical Chemistry C, Vol. 116, Issue 1; ISSN 1932-7447
- Country of Publication:
- United States
- Language:
- English
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