Graphene supported plasmonic photocatalyst for hydrogen evolution in photocatalytic water splitting

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dc.contributor.author Singh, G. P.
dc.contributor.author Shrestha, K. M.
dc.contributor.author Nepal, A.
dc.contributor.author Klabunde, Kenneth J.
dc.contributor.author Sorensen, Christopher M.
dc.date.accessioned 2014-10-14T19:14:05Z
dc.date.available 2014-10-14T19:14:05Z
dc.date.issued 2014-06-14
dc.identifier.uri http://hdl.handle.net/2097/18369
dc.description.abstract It is well known that the noble metal nanoparticles show active absorption in the visible region because of the existence of the unique feature known as surface plasmon resonance (SPR). Here we report the effect of plasmonic Au nanoparticles on the enhancement of the renewable hydrogen (H2) evolution through photocatalytic water splitting. The plasmonic Au/graphene/TiO2 photocatalyst was synthesized in two steps: first the graphene/TiO2 nanocomposites were developed by the hydrothermal decomposition process; then the Au was loaded by photodeposition. The plasmonic Au and the graphene as co-catalyst effectively prolong the recombination of the photogenerated charges. This plasmonic photocatalyst displayed enhanced photocatalytic H2 evolution for water splitting in the presence of methanol as a sacrificial reagent. The H2 evolution rate from the Au/graphene co-catalyst was about 9 times higher than that of a pure graphene catalyst. The optimal graphene content was found to be 1.0 wt %, giving a H2 evolution of 1.34 mmol (i.e., 26 μmolhˉ¹), which exceeded the value of 0.56 mmol (i.e., 112 μmolhˉ¹) observed in pure TiO2. This high photocatalytic H2 evolution activity results from the deposition of TiO2 on graphene sheets, which act as an electron acceptors to efficiently separate the photogenerated charge carriers. However, the Au loading enhanced the H2 evolution dramatically and achieved a maximum value of 12 mmol (i.e., 2.4 mmolhˉ¹) with optimal loading of 2.0 wt% Au on graphene/TiO2 composites. The enhancement of H2 evolution in the presence of Au results from the SPR effect induced by visible light irradiation, which boosts the energy intensity of the trapped electron as well as active sites for photocatalytic activity. en_US
dc.language.iso en_US en_US
dc.relation.uri http://doi.org/10.1088/0957-4484/25/26/265701 en_US
dc.rights This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
dc.rights.uri http://rightsstatements.org/vocab/InC/1.0/
dc.subject Graphene en_US
dc.subject TiO2 en_US
dc.subject Hydrogen en_US
dc.subject Water-splitting en_US
dc.title Graphene supported plasmonic photocatalyst for hydrogen evolution in photocatalytic water splitting en_US
dc.type Article (author version) en_US
dc.date.published 2014 en_US
dc.citation.doi 10.1088/0957-4484/25/26/265701 en_US
dc.citation.issue 26 en_US
dc.citation.jtitle Nanotechnology en_US
dc.citation.spage 265701 en_US
dc.citation.volume 25 en_US
dc.contributor.authoreid kenjk en_US
dc.contributor.authoreid sor en_US


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This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). Except where otherwise noted, the use of this item is bound by the following: This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

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