Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 121, Issue 24, Pages 13070-13077Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b03639
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Funding
- Max Planck Society
- International Max Planck Research School for Polymer Material Science (IMPRS-PMS)
- Max Planck Graduate Center (MPGC)
- The National Creative Research Initiative Center for Intelligent Hybrids [2010-0018290]
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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.
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