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Article: Multilayer core-shell MoS2/CdS nanorods with very high photocatalytic activity for hydrogen production under visible-light excitation and investigation of the photocatalytic mechanism by femtosecond transient absorption spectroscopy

TitleMultilayer core-shell MoS2/CdS nanorods with very high photocatalytic activity for hydrogen production under visible-light excitation and investigation of the photocatalytic mechanism by femtosecond transient absorption spectroscopy
Authors
Issue Date2017
PublisherRoyal Society of Chemistry: Open Access. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/ra
Citation
RSC Advances, 2017, v. 7 n. 88, p. 55993-55999 How to Cite?
AbstractUnderstanding the structural features and the dynamics and properties of charge carriers in photocatalysts is critical to develop them for practical applications. Photocatalytic H2 production on molybdenum sulfide/cadmium sulfide (MoS2/CdS) nanorods in the presence of lactic acid under visible light ([small lambda] > 420 nm) was investigated. The optimized MoS2/CdS photocatalysts with 1.52 wt% MoS2 showed the highest rate of 154.748 [small mu ]mol h-1 mg-1, which is 5 times faster than that of bare CdS nanorods. Experimental results from HR-TEM, UV-vis, and photoelectrochemical measurements suggest that an intimate contact interface, extended light response range, effective separation of the photogenerated charge carriers and high photocurrent density on the MoS2 modification contributed to the photocatalytic enhancement of the MoS2/CdS photocatalysts. Electrochemical measurements indicate that MoS2 is an efficient H2 evolution co-catalyst, which is attributed to the promotion of the photocatalytic activity. Femtosecond transient absorption (fs-TA) spectroscopy was performed to investigate the dynamics of the charge carriers that led to hydrogen production by these composites. The results reveal that the enhanced hole trapping process and effective electrons transfer (within 14.8 ps) from CdS to MoS2 in MoS2/CdS composites can promote their photocatalytic activity dramatically.
Persistent Identifierhttp://hdl.handle.net/10722/252223
ISSN
2017 Impact Factor: 2.936
2015 SCImago Journal Rankings: 0.990

 

DC FieldValueLanguage
dc.contributor.authorYan, Z-
dc.contributor.authorDu, L-
dc.contributor.authorPhillips, DL-
dc.date.accessioned2018-04-12T08:23:17Z-
dc.date.available2018-04-12T08:23:17Z-
dc.date.issued2017-
dc.identifier.citationRSC Advances, 2017, v. 7 n. 88, p. 55993-55999-
dc.identifier.issn2046-2069-
dc.identifier.urihttp://hdl.handle.net/10722/252223-
dc.description.abstractUnderstanding the structural features and the dynamics and properties of charge carriers in photocatalysts is critical to develop them for practical applications. Photocatalytic H2 production on molybdenum sulfide/cadmium sulfide (MoS2/CdS) nanorods in the presence of lactic acid under visible light ([small lambda] > 420 nm) was investigated. The optimized MoS2/CdS photocatalysts with 1.52 wt% MoS2 showed the highest rate of 154.748 [small mu ]mol h-1 mg-1, which is 5 times faster than that of bare CdS nanorods. Experimental results from HR-TEM, UV-vis, and photoelectrochemical measurements suggest that an intimate contact interface, extended light response range, effective separation of the photogenerated charge carriers and high photocurrent density on the MoS2 modification contributed to the photocatalytic enhancement of the MoS2/CdS photocatalysts. Electrochemical measurements indicate that MoS2 is an efficient H2 evolution co-catalyst, which is attributed to the promotion of the photocatalytic activity. Femtosecond transient absorption (fs-TA) spectroscopy was performed to investigate the dynamics of the charge carriers that led to hydrogen production by these composites. The results reveal that the enhanced hole trapping process and effective electrons transfer (within 14.8 ps) from CdS to MoS2 in MoS2/CdS composites can promote their photocatalytic activity dramatically.-
dc.languageeng-
dc.publisherRoyal Society of Chemistry: Open Access. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/ra-
dc.relation.ispartofRSC Advances-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleMultilayer core-shell MoS2/CdS nanorods with very high photocatalytic activity for hydrogen production under visible-light excitation and investigation of the photocatalytic mechanism by femtosecond transient absorption spectroscopy-
dc.typeArticle-
dc.identifier.emailDu, L: ailleen@hku.hk-
dc.identifier.emailPhillips, DL: phillips@hku.hk-
dc.identifier.authorityPhillips, DL=rp00770-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1039/C7RA12118K-
dc.identifier.hkuros284815-
dc.identifier.volume7-
dc.identifier.issue88-
dc.identifier.spage55993-
dc.identifier.epage55999-
dc.publisher.placeUnited Kingdom-

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