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Article: Photocatalytic hydrogen generation from water under visible light using core/shell nano-catalysts

TitlePhotocatalytic hydrogen generation from water under visible light using core/shell nano-catalysts
Authors
KeywordsCore/shell structure
Hydrogen generation
Microemulsion
Nano-photocatalyst
Renewable energy
Visible light
Issue Date2010
PublisherIWA Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwst
Citation
Water Science And Technology, 2010, v. 61 n. 9, p. 2303-2308 How to Cite?
AbstractA microemulsion technique was employed to synthesize nano-sized photocatalysts with a core (CdS)/shell (ZnS) structure. The primary particles of the photocatalysts were around 10 nm, and the mean size of the catalyst clusters in water was about 100 nm. The band gaps of the catalysts ranged from 2.25 to 2.46 eV. The experiments of photocatalytic H 2 generation showed that the catalysts (CdS) x/(ZnS) 1-x with x ranging from 0.1 to 1 were able to produce hydrogen from water photolysis under visible light. The catalyst with x = 0.9 had the highest rate of hydrogen production. The catalyst loading density also influenced the photo-hydrogen production rate, and the best catalyst concentration in water was 1 g L -1. The stability of the nano-catalysts in terms of size, morphology and activity was satisfactory during an extended test period for a specific hydrogen production rate of 2.38 mmol g -1 L -1 h -1 and a quantum yield of 16.1% under visible light (165W Xe lamp, λ > 420 nm). The results demonstrate that the (CdS)/(ZnS) core/shell nano-particles are a novel photo-catalyst for renewable hydrogen generation from water under visible light. This is attributable to the large band-gap ZnS shell that separates the electron/hole pairs generated by the CdS core and hence reduces their recombinations. © IWA Publishing 2010.
Persistent Identifierhttp://hdl.handle.net/10722/132395
ISSN
2015 Impact Factor: 1.064
2015 SCImago Journal Rankings: 0.469
ISI Accession Number ID
Funding AgencyGrant Number
The University of Hong Kong
University Grants Council (UGC) of the Hong Kong SAR GovernmentSEG_HKU10
Funding Information:

This research was supported by URC funding from The University of Hong Kong and Special Equipment Grant SEG_HKU10 from the University Grants Council (UGC) of the Hong Kong SAR Government. The technical assistance of Mr. Keith C.H. Wong is highly appreciated.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorWang, Xen_HK
dc.contributor.authorShih, Ken_HK
dc.contributor.authorLi, XYen_HK
dc.date.accessioned2011-03-28T09:24:06Z-
dc.date.available2011-03-28T09:24:06Z-
dc.date.issued2010en_HK
dc.identifier.citationWater Science And Technology, 2010, v. 61 n. 9, p. 2303-2308en_HK
dc.identifier.issn0273-1223en_HK
dc.identifier.urihttp://hdl.handle.net/10722/132395-
dc.description.abstractA microemulsion technique was employed to synthesize nano-sized photocatalysts with a core (CdS)/shell (ZnS) structure. The primary particles of the photocatalysts were around 10 nm, and the mean size of the catalyst clusters in water was about 100 nm. The band gaps of the catalysts ranged from 2.25 to 2.46 eV. The experiments of photocatalytic H 2 generation showed that the catalysts (CdS) x/(ZnS) 1-x with x ranging from 0.1 to 1 were able to produce hydrogen from water photolysis under visible light. The catalyst with x = 0.9 had the highest rate of hydrogen production. The catalyst loading density also influenced the photo-hydrogen production rate, and the best catalyst concentration in water was 1 g L -1. The stability of the nano-catalysts in terms of size, morphology and activity was satisfactory during an extended test period for a specific hydrogen production rate of 2.38 mmol g -1 L -1 h -1 and a quantum yield of 16.1% under visible light (165W Xe lamp, λ > 420 nm). The results demonstrate that the (CdS)/(ZnS) core/shell nano-particles are a novel photo-catalyst for renewable hydrogen generation from water under visible light. This is attributable to the large band-gap ZnS shell that separates the electron/hole pairs generated by the CdS core and hence reduces their recombinations. © IWA Publishing 2010.en_HK
dc.languageengen_US
dc.publisherIWA Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwsten_HK
dc.relation.ispartofWater Science and Technologyen_HK
dc.subjectCore/shell structureen_HK
dc.subjectHydrogen generationen_HK
dc.subjectMicroemulsionen_HK
dc.subjectNano-photocatalysten_HK
dc.subjectRenewable energyen_HK
dc.subjectVisible lighten_HK
dc.titlePhotocatalytic hydrogen generation from water under visible light using core/shell nano-catalystsen_HK
dc.typeArticleen_HK
dc.identifier.emailWang, X: wangxm@hku.hken_HK
dc.identifier.emailShih, K: kshih@hkucc.hku.hken_HK
dc.identifier.emailLi, XY: xlia@hkucc.hku.hken_HK
dc.identifier.authorityWang, X=rp01452en_HK
dc.identifier.authorityShih, K=rp00167en_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.2166/wst.2010.147en_HK
dc.identifier.pmid20418627-
dc.identifier.scopuseid_2-s2.0-77953693508en_HK
dc.identifier.hkuros178454-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77953693508&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume61en_HK
dc.identifier.issue9en_HK
dc.identifier.spage2303en_HK
dc.identifier.epage2308en_HK
dc.identifier.isiWOS:000277498900017-
dc.publisher.placeUnited Kingdomen_HK
dc.relation.projectEnvironmental Bio-Nano Interface (EBNI) Characterization System-
dc.identifier.scopusauthoridWang, X=23092524200en_HK
dc.identifier.scopusauthoridShih, K=14072108900en_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK

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