Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 9, Pages 2917-2920Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b12521
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Funding
- Hundred Talents Program of the Chinese Academy of Science
- National Natural Science Foundation of China [21573264, 21273255, 21303232, 21433007]
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Synchronous illumination X-ray photoelectron spectroscopy (SIXPS) was employed for the first time to directly identify the photogenerated charge separation and transfer on anatase TiO2 single-crystals with selectively etched {001} facets. More specifically, for the TiO2 crystals with intact {001} and {101} facets, most of photo generated charge carriers rapidly recombined, and no evident electron hole separation was detected. With selectively etching on {001} facets, high efficient charge separation via hole transfer to titanium and electron to oxygen was clearly observed. However, when the {001} facets were completely etched into a hollow structure, the recombination for photogenerated electron hole pairs would dominate again. These demonstrations dearly reveal that the appropriate corrosion on {001} facets could facilitate more efficient electron hole separation and transfer. As expected, the optimized TiO2 micro crystals with etched {001} facets could achieve a hydrogen generation rate of 74.3 mu mol/h/g, which is nearly 7 times higher than the intact-TiO2 crystals.
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