Codoping titanium dioxide nanowires with tungsten and carbon for enhanced photoelectrochemical performance
- Title
- Codoping titanium dioxide nanowires with tungsten and carbon for enhanced photoelectrochemical performance
- Author
- 김동립
- Keywords
- DOPED TIO2; HYDROGEN-PRODUCTION; VISIBLE-LIGHT; WATER; PHOTOCATALYSIS; EFFICIENT; DEGRADATION; NANORODS; ARRAYS; DYE
- Issue Date
- 2013-04
- Publisher
- Nature Publishing Group
- Citation
- Nature Communications, April 2013, 4, P.8
- Abstract
- Recent density-functional theory calculations suggest that codoping TiO2 with donor-acceptor pairs is more effective than monodoping for improving photoelectrochemical water-splitting performance because codoping can reduce charge recombination, improve material quality, enhance light absorption and increase solubility limits of dopants. Here we report a novel ex-situ method to codope TiO2 with tungsten and carbon (W, C) by sequentially annealing W-precursor-coated TiO2 nanowires in flame and carbon monoxide gas. The unique advantages of flame annealing are that the high temperature (>1,000 degrees C) and fast heating rate of flame enable rapid diffusion of W into TiO2 without damaging the nanowire morphology and crystallinity. This is the first experimental demonstration that codoped TiO2:(W, C) nanowires outperform monodoped TiO2:W and TiO2:C and double the saturation photocurrent of undoped TiO2 for photoelectrochemical water splitting. Such significant performance enhancement originates from a greatly improved electrical conductivity and activity for oxygen-evolution reaction due to the synergistic effects of codoping.
- URI
- http://www.nature.com/articles/ncomms2729http://hdl.handle.net/20.500.11754/52832
- ISSN
- 2041-1723
- DOI
- 10.1038/ncomms2729
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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