Journal
CHEMISTRY OF MATERIALS
Volume 16, Issue 5, Pages 846-849Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm035090w
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Bromine and chlorine co-doped nanocrystalline titanium dioxide are synthesized by a hydrothermal method using titanium chloride in a mixed hydrobromic acid-ethanol system. TiO2 with anatase, mixed anatase/rutile, rutile, mixed rutile/brookite, mixed anatase/rutile/ brookite, and rutile phases are obtained, in that order, by increasing the acidity through addition of HBr. Br- and Cl- co-doping causes the absorption edge of TiO2 to shift to a lower energy region. The photocatalytic activity of doped TiO2 with mixed anatase/rutile phases exceeds that of commercial TiO2 photocatalyst Degussa P-25 for water splitting into H-2 and O-2 under ullraviolet light.
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