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Proceedings Paper

Ultrafast dynamics of colloidal semiconductor nanocrystals relevant to solar fuels production
Author(s): Nicole M. B. Cogan; Cunming Liu; Fen Qiu; Rebeckah Burke; Todd D. Krauss
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Paper Abstract

Artificial conversion of sunlight to chemical fuels has attracted attention for several decades as a potential source of clean, renewable energy. We recently found that CdSe quantum dots (QDs) and simple aqueous Ni2+ salts in the presence of a sacrificial electron donor form a highly efficient, active, and robust system for photochemical reduction of protons to molecular hydrogen. Ultrafast transient absorption spectroscopy studies of electron transfer (ET) processes from the QDs to the Ni catalysts reveal extremely fast ET, and provide a fundamental explanation for the exceptional photocatalytic H2 activity. Additionally, by studying H2 production of the Ni catalyst with CdSe/CdS nanoparticles of various structures, it was determined that surface charge density plays an important role in charge transfer and ultimately H2 production activity.

Paper Details

Date Published: 22 May 2017
PDF: 11 pages
Proc. SPIE 10193, Ultrafast Bandgap Photonics II, 101930B (22 May 2017); doi: 10.1117/12.2262168
Show Author Affiliations
Nicole M. B. Cogan, Univ. of Rochester (United States)
Cunming Liu, Univ. of Rochester (United States)
Fen Qiu, Univ. of Rochester (United States)
Rebeckah Burke, Univ. of Rochester (United States)
Todd D. Krauss, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 10193:
Ultrafast Bandgap Photonics II
Michael K. Rafailov, Editor(s)

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