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dc.contributor.authorKuehnel, Moritz F
dc.contributor.authorSahm, Constantin D
dc.contributor.authorNeri, Gaia
dc.contributor.authorLee, Jonathan R
dc.contributor.authorOrchard, Katherine L
dc.contributor.authorCowan, Alexander J
dc.contributor.authorReisner, Erwin
dc.date.accessioned2018-03-27T14:51:45Z
dc.date.available2018-03-27T14:51:45Z
dc.date.issued2018-03-07
dc.identifier.issn2041-6520
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/274429
dc.description.abstractA precious metal and Cd-free photocatalyst system for efficient CO2 reduction in water is reported. The hybrid assembly consists of ligand-free ZnSe quantum dots (QDs) as a visible-light photosensitiser combined with a phosphonic acid-functionalised Ni(cyclam) catalyst, NiCycP. This precious metal-free photocatalyst system shows a high activity for aqueous CO2 reduction to CO (Ni-based TONCO > 120), whereas an anchor-free catalyst, Ni(cyclam)Cl2, produced three times less CO. Additional ZnSe surface modification with 2-(dimethylamino)ethanethiol (MEDA) partially suppresses H2 generation and enhances the CO production allowing for a Ni-based TONCO of > 280 and more than 33% selectivity for CO2 reduction over H2 evolution, after 20 h visible light irradiation (λ > 400 nm, AM 1.5G, 1 sun). The external quantum efficiency of 3.4 ± 0.3% at 400 nm is comparable to state-of-the-art precious metal photocatalysts. Transient absorption spectroscopy showed that band-gap excitation of ZnSe QDs is followed by rapid hole scavenging and very fast electron trapping in ZnSe. The trapped electrons transfer to NiCycP on the ps timescale, explaining the high performance for photocatalytic CO2 reduction. With this work we introduce ZnSe QDs as an inexpensive and efficient visible light-absorber for solar fuel generation.
dc.format.mediumElectronic-eCollection
dc.languageeng
dc.publisherRoyal Society of Chemistry (RSC)
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleZnSe quantum dots modified with a Ni(cyclam) catalyst for efficient visible-light driven CO2 reduction in water.
dc.typeArticle
prism.endingPage2509
prism.issueIdentifier9
prism.publicationDate2018
prism.publicationNameChem Sci
prism.startingPage2501
prism.volume9
dc.identifier.doi10.17863/CAM.21554
dcterms.dateAccepted2018-01-24
rioxxterms.versionofrecord10.1039/c7sc04429a
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
rioxxterms.licenseref.startdate2018-03
dc.contributor.orcidKuehnel, Moritz F [0000-0001-8678-3779]
dc.contributor.orcidSahm, Constantin D [0000-0001-8472-0395]
dc.contributor.orcidNeri, Gaia [0000-0003-1326-9327]
dc.contributor.orcidLee, Jonathan R [0000-0002-5447-0732]
dc.contributor.orcidOrchard, Katherine L [0000-0002-6349-1316]
dc.contributor.orcidCowan, Alexander J [0000-0001-9032-3548]
dc.contributor.orcidReisner, Erwin [0000-0002-7781-1616]
dc.identifier.eissn2041-6539
rioxxterms.typeJournal Article/Review
pubs.funder-project-idChristian Doppler Forschungsgesellschaft (unknown)
pubs.funder-project-idTohoku University (unknown)
cam.issuedOnline2018-01-24
cam.orpheus.successThu Jan 30 10:20:10 GMT 2020 - The item has an open VoR version.
rioxxterms.freetoread.startdate2100-01-01


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International