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- Title
Photocatalytic Formic Acid Conversion on CdS Nanocrystals with Controllable Selectivity for H<sub>2</sub> or CO.
- Authors
Kuehnel, Moritz F.; Wakerley, David W.; Orchard, Katherine L.; Reisner, Erwin
- Abstract
Formic acid is considered a promising energy carrier and hydrogen storage material for a carbon-neutral economy. We present an inexpensive system for the selective room-temperature photocatalytic conversion of formic acid into either hydrogen or carbon monoxide. Under visible-light irradiation ( λ>420 nm, 1 sun), suspensions of ligand-capped cadmium sulfide nanocrystals in formic acid/sodium formate release up to 116±14 mmol H2 gcat−1 h−1 with >99 % selectivity when combined with a cobalt co-catalyst; the quantum yield at λ=460 nm was 21.2±2.7 %. In the absence of capping ligands, suspensions of the same photocatalyst in aqueous sodium formate generate up to 102±13 mmol CO gcat−1 h−1 with >95 % selectivity and 19.7±2.7 % quantum yield. H2 and CO production was sustained for more than one week with turnover numbers greater than 6×105 and 3×106, respectively.
- Subjects
FORMIC acid; HYDROGEN; CARBON monoxide; CADMIUM sulfide; COBALT catalysts; PHOTOCATALYSTS; NANOCRYSTALS
- Publication
Angewandte Chemie International Edition, 2015, Vol 54, Issue 33, p9627
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201502773