A facile strategy to fabricate high-quality single crystalline brookite TiO2 nanoarrays and their photoelectrochemical properties
SCIE
SCOPUS
- Title
- A facile strategy to fabricate high-quality single crystalline brookite TiO2 nanoarrays and their photoelectrochemical properties
- Authors
- Choi, M; Yong, K
- Date Issued
- 2014-11
- Publisher
- ROYAL SOC CHEMISTRY
- Abstract
- Vertically aligned high-quality single crystalline brookite TiO2 nanoarrays were synthesized for the first time using an environmentally benign one-step hydrothermal reaction. They have a unique bullet-shaped structure which has a length of 700-1000 nm and a width of 150-250 nm with a sharpened tip structure. By adjusting the concentration of NaOH in hydrothermal reaction, we could also synthesize other types of TiO2 nanostructures including anatase TiO2 nanotubes/nanowires. The morphologies and crystal structures of the products were confirmed by scanning electron microscopy, transmission electron microscopy and X-ray diffraction analysis. Their vertically aligned structures facilitate their application as photoanodes in photoelectrochemical cells, and the photoelectrochemical properties such as photocurrent density and open circuit voltage were measured in a three-electrode electrochemical cell with TiO2 nanoarrays, Ag/AgCl and a Pt flag as the working, reference and counter electrodes, respectively, incorporating a 0.1 M NaOH electrolyte solution. The fabricated brookite TiO2 nanoarrays exhibited a highly enhanced photocurrent density and a longer electron lifetime compared with anatase TiO2 nanoarrays with similar lengths.
- Keywords
- HYDROTHERMAL CONDITIONS; TITANATE NANOTUBES; TITANIUM-DIOXIDE; SOLAR-CELLS; ANATASE; RUTILE; NANOPARTICLES; NANOSHEETS; PHASE; TRANSITION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11751
- DOI
- 10.1039/C4NR04735D
- ISSN
- 2040-3364
- Article Type
- Article
- Citation
- NANOSCALE, vol. 6, no. 22, page. 13900 - 13909, 2014-11
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