Correlating Carrier Dynamics and Photocatalytic Hydrogen Generation in Pt Decorated CdSe Tetrapods as a Function of Cocatalyst Size
| Autor: | Hai I. Wang, Enrique Cánovas, Melike Karakus, Younghun Sung, Zoltan Mics, Mischa Bonn, Kookheon Char |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Electron capture Nanoparticle Nanotechnology 02 engineering and technology Electron 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Terahertz spectroscopy and technology Metal General Energy Chemical engineering visual_art visual_art.visual_art_medium Photocatalysis Particle Physical and Theoretical Chemistry 0210 nano-technology Hydrogen production |
| Zdroj: | The Journal of Physical Chemistry C. 121:13070-13077 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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