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Graphitic carbon nitride (g-C3N4)-Pt-TiO2 nanocomposite as an efficient photocatalyst for hydrogen production under visible light irradiation
Ist Teil von
Physical chemistry chemical physics : PCCP, 2012-01, Vol.14 (48), p.16745-16752
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Porous graphitic carbon nitride (g-C
3
N
4
) was prepared by a simple pyrolysis of urea, and then a g-C
3
N
4
-Pt-TiO
2
nanocomposite was fabricated
via
a facile chemical adsorption followed by a calcination process. The obtained products were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance absorption spectra, and electron microscopy. It is found that the visible-light-induced photocatalytic hydrogen evolution rate can be remarkably enhanced by coupling TiO
2
with the above g-C
3
N
4
, and the g-C
3
N
4
-Pt-TiO
2
composite with a mass ratio of 70 : 30 has the maximum photoactivity and excellent photostability for hydrogen production under visible-light irradiation, and the stable photocurrent of g-C
3
N
4
-TiO
2
is about 1.5 times higher than that of the bare g-C
3
N
4
. The above experimental results show that the photogenerated electrons of g-C
3
N
4
can directionally migrate to Pt-TiO
2
due to the close interfacial connections and the synergistic effect existing between Pt-TiO
2
and g-C
3
N
4
where photogenerated electrons and holes are efficiently separated in space, which is beneficial for retarding the charge recombination and improving the photoactivity.
A visible-light-responsive g-C
3
N
4
-Pt-TiO
2
nanocomposite with efficient photogenerated carrier separation in space was fabricated.