Oxygen Diffusion in Nanocrystalline CeO2
A unique ability of CeO2 to gain or lose oxygen ion has valued importance in the area of solid oxide fuel cells and catalysts. The macroscopic nature of oxygen storage, release and thereby vacancy generation, transport is explained with the help of quantum mechanical phenomena of electron localization. In this study, 18O diffusion and related transport on 1-2 mm thick nanocrystalline ceria films prepared by sol-gel process with an average grain-size in the range of 3-6 nm are studied. Initial 18O diffusion results indicate increased diffusion in 6 nm average grain-size nano-ceria films compared to {approx} 38 nm average grain-size poly-ceria films. Conductivity values in the case of {approx} 3nm average grain size CeO2 films grown at 300 0C observed to be marginally increased compared to {approx} 6 nm average grain size ceria films grown at 450 0C. A detailed nano-grain analysis by high-resolution transmission electron microscopy (HRTEM) was carried out to understand the effect of nanocrystallinity on the blocking phenomena.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 15007820
- Report Number(s):
- PNNL-SA-39051; TRN: US0402509
- Resource Relation:
- Conference: IEEE-NANO 2003: Proceedings: 2003 3rd IEEE Conference on Nanotechnology, San Francisco, CA (US), 08/12/2003--08/14/2003; Other Information: PBD: 14 Aug 2003
- Country of Publication:
- United States
- Language:
- English
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