In:
Zeitschrift für Physikalische Chemie, Walter de Gruyter GmbH, Vol. 229, No. 1-2 ( 2015-2-28), p. 205-219
Abstract:
CdSe/CdS core-shell nanocrystals with controlled
CdS shell thickness and CdSe core size were synthesized for several different values of these two parameters. The particles in
aqueous dispersion were in situ decorated with Ni nanoparticles and evaluated for photocatalytic hydrogen generation capacity. The
highest H 2 production quantum yield at 457 nm
illumination was 4.7%, while at 530 nm it rose to 9.1%. We have found that ensuring equal absorption at
illumination wavelength the H 2 formation rate increases with
the shell thickness, but decreases with the increasing core size. Interestingly, the same trend was observed for the
photoluminesce quantum yield and lifetime for samples without Ni decoration, suggesting that they reflect the balance between
charge transfer and avoidance of recombination sites which is crucial for photocatalysis with semiconductor nanocrystals. Moreover, the
core-shell nanocrystals constitute a very convenient model system in which the charge carrier dynamics in photocatalytic applications can
be studied. In comparison with well-known CdSe/CdS dot-in-rod structures they are less efficient at blue illumination,
but they allow for significant extension of the usable absorption range.
Type of Medium:
Online Resource
ISSN:
0942-9352
,
2196-7156
DOI:
10.1515/zpch-2014-0635
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2015
detail.hit.zdb_id:
201103-7
Bookmarklink