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
Understanding 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...
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description | Understanding 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 (λ > 420 nm) was investigated. The optimized MoS2/CdS photocatalysts with 1.52 wt% MoS2 showed the highest rate of 154.748 μmol 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. |
doi_str_mv | 10.1039/c7ra12118k |
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Photocatalytic H2 production on molybdenum sulfide/cadmium sulfide (MoS2/CdS) nanorods in the presence of lactic acid under visible light (λ > 420 nm) was investigated. The optimized MoS2/CdS photocatalysts with 1.52 wt% MoS2 showed the highest rate of 154.748 μmol 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.</description><identifier>EISSN: 2046-2069</identifier><identifier>DOI: 10.1039/c7ra12118k</identifier><language>eng</language><publisher>Cambridge: Royal Society of Chemistry</publisher><subject>Cadmium sulfide ; Catalytic activity ; Current carriers ; Dynamic structural analysis ; Hydrogen production ; Hydrogen storage ; Investigations ; Lactic acid ; Molybdenum disulfide ; Nanorods ; Photocatalysis ; Photocatalysts ; Photoelectric effect ; Photoelectric emission ; Spectrum analysis</subject><ispartof>RSC advances, 2017-01, Vol.7 (88), p.55993-55999</ispartof><rights>Copyright Royal Society of Chemistry 2017</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,864,27924,27925</link.rule.ids></links><search><creatorcontrib>Yan, Zhiping</creatorcontrib><creatorcontrib>Du, Lili</creatorcontrib><creatorcontrib>David Lee Phillips</creatorcontrib><title>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</title><title>RSC advances</title><description>Understanding 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 (λ > 420 nm) was investigated. The optimized MoS2/CdS photocatalysts with 1.52 wt% MoS2 showed the highest rate of 154.748 μmol 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.</description><subject>Cadmium sulfide</subject><subject>Catalytic activity</subject><subject>Current carriers</subject><subject>Dynamic structural analysis</subject><subject>Hydrogen production</subject><subject>Hydrogen storage</subject><subject>Investigations</subject><subject>Lactic acid</subject><subject>Molybdenum disulfide</subject><subject>Nanorods</subject><subject>Photocatalysis</subject><subject>Photocatalysts</subject><subject>Photoelectric effect</subject><subject>Photoelectric emission</subject><subject>Spectrum analysis</subject><issn>2046-2069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNpdkE1OwzAQhSMkJKrSDScYiXWo7SROskQVf1IrFoV15TiTxiW1g-0UsuMO3JAlp8AqrJjNSPP03qd5UXRByRUlSTmXuRWUUVq8nEQTRlIeM8LLs2jm3I6E4RllnE6i79XQedWJES1IY_Hr49O12HWwMms2X9Rr0EIba2oHb8q3cEA7Qqu2LfSt8UYKL7rRKwlCenVQfoTGWGjH2potauiDcwiK0TDoOjAOyqmqw7gLER7wXSovjrLQNSh9QOfV9vdiGvAt_ufsUbZCK7eHKrBw741DaYLZW6GdQu1BVM7Y_pjhepTeGidNP55Hp43oHM7-9jR6vr15WtzHy8e7h8X1Mu4ZLX2c51XJUpJWaRoqy3lWF0kpOcvSNGmKUjaiTkLFkmdN1fCcVcixKAua8bJhdUKSaXT5mxuefx3CQ5udGawOyA0jlBRFHrKSH8Wsi9Y</recordid><startdate>20170101</startdate><enddate>20170101</enddate><creator>Yan, Zhiping</creator><creator>Du, Lili</creator><creator>David Lee Phillips</creator><general>Royal Society of Chemistry</general><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20170101</creationdate><title>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</title><author>Yan, Zhiping ; Du, Lili ; David Lee Phillips</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-p219t-77b92404b44206765d839c625443f89cfad3103c65fbf672be6e8981569f2d303</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Cadmium sulfide</topic><topic>Catalytic activity</topic><topic>Current carriers</topic><topic>Dynamic structural analysis</topic><topic>Hydrogen production</topic><topic>Hydrogen storage</topic><topic>Investigations</topic><topic>Lactic acid</topic><topic>Molybdenum disulfide</topic><topic>Nanorods</topic><topic>Photocatalysis</topic><topic>Photocatalysts</topic><topic>Photoelectric effect</topic><topic>Photoelectric emission</topic><topic>Spectrum analysis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yan, Zhiping</creatorcontrib><creatorcontrib>Du, Lili</creatorcontrib><creatorcontrib>David Lee Phillips</creatorcontrib><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>RSC advances</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yan, Zhiping</au><au>Du, Lili</au><au>David Lee Phillips</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>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</atitle><jtitle>RSC advances</jtitle><date>2017-01-01</date><risdate>2017</risdate><volume>7</volume><issue>88</issue><spage>55993</spage><epage>55999</epage><pages>55993-55999</pages><eissn>2046-2069</eissn><abstract>Understanding 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 (λ > 420 nm) was investigated. The optimized MoS2/CdS photocatalysts with 1.52 wt% MoS2 showed the highest rate of 154.748 μmol 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.</abstract><cop>Cambridge</cop><pub>Royal Society of Chemistry</pub><doi>10.1039/c7ra12118k</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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source | DOAJ Directory of Open Access Journals; EZB-FREE-00999 freely available EZB journals |
subjects | Cadmium sulfide Catalytic activity Current carriers Dynamic structural analysis Hydrogen production Hydrogen storage Investigations Lactic acid Molybdenum disulfide Nanorods Photocatalysis Photocatalysts Photoelectric effect Photoelectric emission Spectrum analysis |
title | 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 |
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