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    On the role of metal particle size and surface coverage for photo-catalytic hydrogen production; a case study of the Au/CdS system

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    Type
    Article
    Authors
    Majeed, I.
    Nadeem, M.Amtiaz
    Al-Oufi, M.
    Nadeem, M.Arif
    Waterhouse, G.I.N.
    Badshah, A.
    Metson, J.B.
    Idriss, H. cc
    KAUST Department
    SABIC - Corporate Research and Innovation Center (CRI) at KAUST
    Date
    2015-09-25
    Online Publication Date
    2015-09-25
    Print Publication Date
    2016-03
    Permanent link to this record
    http://hdl.handle.net/10754/598426
    
    Metadata
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    Abstract
    Photo-catalytic hydrogen production has been studied on Au supported CdS catalysts under visible light irradiation in order to understand the effect of Au particle size as well as the reaction medium properties. Au nanoparticles of size about 2-5 nm were deposited over hexagonal CdS particles using a new simple method involving reduction of Au3+ ions with iodide ions. Within the investigated range of Au (between 1 and 5 wt. %) fresh particles with mean size of 4 nm and XPS Au4f/Cd3d surface ratio of 0.07 showed the highest performance (ca. 1 molecule of H2 / Auatom s−1) under visible light irradiation (>420 nm and a flux of 35 mW/cm2). The highest hydrogen production rate was obtained from water (92%)-ethanol (8%) in an electrolyte medium (Na2S-Na2SO3). TEM studies of fresh and used catalysts showed that Au particle size increases (almost 5 fold) with increasing photo-irradiation time due to photo-agglomeration effect yet no sign of deactivation was observed. A mechanism for hydrogen production from ethanol-water electrolyte mixture is presented and discussed.
    Citation
    On the role of metal particle size and surface coverage for photo-catalytic hydrogen production; a case study of the Au/CdS system 2015 Applied Catalysis B: Environmental
    Publisher
    Elsevier BV
    Journal
    Applied Catalysis B: Environmental
    DOI
    10.1016/j.apcatb.2015.09.039
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0926337315301636
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.apcatb.2015.09.039
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