Degradation in photocatalytic activity induced by hydrogen-related defects in nano-LiNbO{sub 3} material
- Ecomaterials and Renewable Energy Research Center, Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)
As a representative example, nano-LiNbO{sub 3} is prepared by a wet-chemical method in order to enhance its photocatalytic activity through improving the surface area. The samples perform good crystallinity from powder x-ray diffraction and transmission-electron-microscope observations. It is surprising that photocatalytic activity of nano-LiNbO{sub 3} decreases with an increase of its surface area. The presence of hydrogen in the as-prepared LiNbO{sub 3} samples is detected by measuring the OH{sup -} absorption that occurred near 3500 cm{sup -1} in infrared spectra. Though the surface area of the nano-LiNbO{sub 3} samples with good crystallinity increases with a decrease of the sintered temperature, the number of hydrogen-related defects in the samples increases noticeably, thus reducing the photocatalytic activities of the nano-LiNbO{sub 3} samples.
- OSTI ID:
- 20778639
- Journal Information:
- Applied Physics Letters, Vol. 88, Issue 7; Other Information: DOI: 10.1063/1.2175479; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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