Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 33, Pages 9627-9631Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201502773
Keywords
CdS; formic acid; hydrogen; photocatalysis; quantum dots
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Funding
- Christian Doppler Research Association
- OMV Group
- EPSRC [EP/H00338X/2]
- Isaac Newton Trust
- German Research Foundation
- Advanced Institute for Materials Research-Cambridge Joint Research Centre
- Engineering and Physical Sciences Research Council [EP/H00338X/2, 1235151] Funding Source: researchfish
- EPSRC [EP/H00338X/2] Funding Source: UKRI
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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 (>420nm, 1sun), suspensions of ligand-capped cadmium sulfide nanocrystals in formic acid/sodium formate release up to 116 +/- 14mmolH(2)g(cat)(-1)h(-1) with >99% selectivity when combined with a cobalt co-catalyst; the quantum yield at =460nm was 21.2 +/- 2.7%. In the absence of capping ligands, suspensions of the same photocatalyst in aqueous sodium formate generate up to 102 +/- 13mmolCOg(cat)(-1)h(-1) with >95% selectivity and 19.7 +/- 2.7% quantum yield. H-2 and CO production was sustained for more than one week with turnover numbers greater than 6x10(5) and 3x10(6), respectively.
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