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Correlating Carrier Dynamics and Photocatalytic Hydrogen Generation in Pt Decorated CdSe Tetrapods as a Function of Cocatalyst Size

Cited 15 time in Web of Science Cited 15 time in Scopus
Authors

Karakus, Melike; Sung, Younghun; Wang, Hai I.; Mics, Zoltan; Char, Kookheon; Bonn, Mischa; Canovas, Enrique

Issue Date
2017-06
Publisher
American Chemical Society
Citation
Journal of Physical Chemistry C, Vol.121 No.24, pp.13070-13077
Abstract
We investigate photoinduced carrier dynamics by time resolved terahertz spectroscopy (TRTS) in Pt nanoparticle decorated CdSe tetrapods as a function of Pt nanoparticles size (and identical areal density). We find that the collection efficiency of electrons photo generated in the tetrapods by the Pt particle increases as a function of Pt nanoparticle size. However, the photocatalytic H-2 generation efficiency is reduced for tetrapods decorated with larger Pt particles. Our results demonstrate a competition between electron capture efficiency at the semiconducting/metal interface, increasing with nanoparticles size, and electron release efficiency at the metal/water interface, decreasing with nanoparticles size. This trade-off defines an optimum for photocatalytic H-2 generation in Pt cocatalyst decorated CdSe tetrapods as a function of Pt size.
ISSN
1932-7447
Language
English
URI
https://hdl.handle.net/10371/148216
DOI
https://doi.org/10.1021/acs.jpcc.7b03639
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