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

Handle URI:
http://hdl.handle.net/10754/598426
Title:
On the role of metal particle size and surface coverage for photo-catalytic hydrogen production; a case study of the Au/CdS system
Authors:
Majeed, I.; Nadeem, M.Amtiaz; Al-Oufi, M.; Nadeem, M.Arif; Waterhouse, G.I.N.; Badshah, A.; Metson, J.B.; Idriss, H. ( 0000-0001-5198-9232 )
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.
KAUST Department:
SABIC - Corporate Research and Innovation Center (CRI) at KAUST
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
Issue Date:
25-Sep-2015
DOI:
10.1016/j.apcatb.2015.09.039
Type:
Article
ISSN:
09263373
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0926337315301636
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorMajeed, I.en
dc.contributor.authorNadeem, M.Amtiazen
dc.contributor.authorAl-Oufi, M.en
dc.contributor.authorNadeem, M.Arifen
dc.contributor.authorWaterhouse, G.I.N.en
dc.contributor.authorBadshah, A.en
dc.contributor.authorMetson, J.B.en
dc.contributor.authorIdriss, H.en
dc.date.accessioned2016-02-25T13:20:31Zen
dc.date.available2016-02-25T13:20:31Zen
dc.date.issued2015-09-25en
dc.identifier.citationOn 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: Environmentalen
dc.identifier.issn09263373en
dc.identifier.doi10.1016/j.apcatb.2015.09.039en
dc.identifier.urihttp://hdl.handle.net/10754/598426en
dc.description.abstractPhoto-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.en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0926337315301636en
dc.subjectAu-CdSen
dc.subjectPhoto-catalytic hydrogen productionen
dc.subjectMetal particle agglomerationen
dc.subjectVisible light irradiationen
dc.subjectEthanol-water splittingen
dc.titleOn the role of metal particle size and surface coverage for photo-catalytic hydrogen production; a case study of the Au/CdS systemen
dc.typeArticleen
dc.contributor.departmentSABIC - Corporate Research and Innovation Center (CRI) at KAUSTen
dc.identifier.journalApplied Catalysis B: Environmentalen
dc.contributor.institutionDepartment of Chemistry and Department of Environmental Sciences, Quid-i-Azam University, Islamabad 4200, Pakistanen
dc.contributor.institutionSchool of Chemical Sciences, University of Auckland, Private Bag 92019 Auckland, New Zealanden
dc.contributor.institutionDepartment of Chemistry, University College London, London WC1H 0AJ, UKen
kaust.authorNadeem, M. Amtiazen
kaust.authorAl-Oufi, M.en
kaust.authorIdriss, H.en
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