Rapid Synthesis of Porous, Mixed Phase Titania Films with Tailored Orientation of Rutile for Enhanced Photocatalytic Performance

• We report on a new, one-step electrochemical oxidation method for the rapid synthesis of mixed phase, polycrystalline TiO2 porous films with oriented rutile within a few minutes. The orientation as well as the surface chemical composition of rutile nanocrystallites can readily be tuned by adjusting the additive concentrations of HCl or HF in the electrolyte during synthesis. All TiO2 films show similar large specific surface area, which is ideal for the application of photocatalysis and photoelectrocatalysis. Compared to the random-oriented TiO2 film, films with an increasing portion of exposed rutile (101) facets were found to be characterized by enhanced photocatalytic oxidation and photoelectrochemical performances. We also observed a synergistic promotion effect of the orientation and surface F impurity. Most interesting, our tailor-oriented porous TiO2 films prepared using HF as additive show an impressive photocurrent generation at zero bias, which is similar to 50 times higher compared to that of the random-oriented TiO2 film.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Kemiteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Chemical Engineering (hsv//eng)

Nyckelord

CHEMICAL PHYSICS LETTERS

NANOPARTICLES

V98

GROWTH

P55

V192

1993

1994

GRENOBLE

HYDROTHERMAL CONDITIONS

OI WY

FRANCE

FACETS

NANORODS

POWDER

UDY OF MAGNETISM

V205

PHOTOREACTIVITY

SURFACE

P55

TIO2 SINGLE-CRYSTALS

AFFORD U

ANATASE TIO2

1993

JOURNAL OF PHYSICAL CHEMISTRY

JAN 21-23

P13669

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