Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 1, Pages 92-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01652
Keywords
semiconductor nanocrystals; product selectivity; photodeposition; electron scavenger; phosphonate ligands
Funding
- Center for Light Energy Activated Redox Processes (LEAP) - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001059]
- National Science Foundation [DGE-1324585]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) [ECCS-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1720139]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
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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 similar to 1%.
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