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

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 photogenerated in the tetrapods by the Pt...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physical chemistry. C 2017-06, Vol.121 (24), p.13070-13077
Main Authors: Karakus, Melike, Sung, Younghun, Wang, Hai I, Mics, Zoltán, Char, Kookheon, Bonn, Mischa, Cánovas, Enrique
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 photogenerated in the tetrapods by the Pt particle increases as a function of Pt nanoparticle size. However, the photocatalytic H2 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 H2 generation in Pt cocatalyst decorated CdSe tetrapods as a function of Pt size.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.7b03639