Journal
ADVANCED MATERIALS INTERFACES
Volume 6, Issue 17, Pages -Publisher
WILEY
DOI: 10.1002/admi.201901121
Keywords
colored TiO2 ultrafine nanowires; defect-host crystal; edge dislocations; one-step hydrosolvothermal synthesis; photodegradation
Funding
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Early Career Research program [67037]
- DOE Office of Biological and Environmental Research
- U.S. Department of Energy [DE-AC05-76RLO1830]
- Winston Chung Global Energy Center at UC Riverside
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Titanium oxide is the most widely used material for photocatalytic applications due to its low cost and environmental friendliness. One of the grand challenges to improve its energy conversion efficiency is to utilize more visible light while inhibiting the recombination of photogenerated electrons and holes. A one-step hydrosolvothermal method is used to obtain colored ultrafine nanowires of rutile and nanoparticles of anatase with edge dislocations, which induce broadened visible solar absorption (400-900 nm) and improve photocatalytic efficiency up to 1.8 times that of rutile or anatase without defects. Enhanced photocatalytic activity of these structures is demonstrated by photodegrading methylene blue measurements under simulated solar light irradiation. Results show the existence of Ti3+, induced by edge dislocations, and subsequent electronic band structure-property relationships. This work highlights a strategy for generating sufficient desired defects in TiO2 nanostructures, leading to broadened visible solar absorption and improved photocatalytic efficiency under visible light irradiation.
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