Abstract
This Forum Article describes the photocatalytic oxidation of benzyl alcohol by visible-light-absorbing colloidal CdS quantum dots (QDs), with 99% selectivity for benzaldehyde or 91% selectivity for C-C coupled products (primarily hydrobenzoin). The selectivity is tuned through the number of low-valent Cd atoms photodeposited on the surfaces of the QDs in situ; this deposition is enhanced by addition of a Cd2+ salt and suppressed by addition of an electron scavenger, anthroquinone-2-sulfonate, to the reaction mixture. In both cases, the external quantum efficiency (number of oxidative equivalents extracted from the QDs per incident photon) of the system is ∼1%.
Original language | English |
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Pages (from-to) | 92-96 |
Number of pages | 5 |
Journal | ACS Applied Energy Materials |
Volume | 2 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 28 2019 |
Keywords
- Electron scavenger
- Phosphonate ligands
- Photodeposition
- Product selectivity
- Semiconductor nanocrystals
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Energy Engineering and Power Technology
- Electrochemistry
- Materials Chemistry
- Electrical and Electronic Engineering