On the role of metal particle size and surface coverage for photo-catalytic hydrogen production; a case study of the Au/CdS system
Type
ArticleAuthors
Majeed, I.Nadeem, M.Amtiaz
Al-Oufi, M.
Nadeem, M.Arif
Waterhouse, G.I.N.
Badshah, A.
Metson, J.B.
Idriss, H.

KAUST Department
SABIC - Corporate Research and Innovation Center (CRI) at KAUSTDate
2015-09-25Online Publication Date
2015-09-25Print Publication Date
2016-03Permanent link to this record
http://hdl.handle.net/10754/598426
Metadata
Show full item recordAbstract
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: EnvironmentalPublisher
Elsevier BVAdditional Links
http://linkinghub.elsevier.com/retrieve/pii/S0926337315301636ae974a485f413a2113503eed53cd6c53
10.1016/j.apcatb.2015.09.039