Effect of platinum loading on the photocatalytic activity and luminescence of cadmium sulfide powder

Journal Article · Thu Jul 27 04:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100352a043· OSTI ID:6985890

Uchihara, Toshio; Matsumura, Michio; Yamamoto, Atsushi; Tsubomura, Hiroshi ^[1]

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1. Osaka Univ. (Japan)

The effect of platinum loading on the efficiency of CdS-photocatalyzed hydrogen evolution from an aqueous solution of sodium sulfide and on the intensity of the green emission (510 nm) of CdS suspended in the same solution was studied. The Fermi level of the CdS photocatalyst at the working condition can be estimated from the intensity of the green emission of the platinum-loaded CdS powder and the luminescence-potential curve of a CdS electrode. When the amount of platinum deposited on CdS is increased, the Fermi level of CdS at the working stage is moved down toward more positive potential, leading to a stronger band bending, and the photocatalytic reaction is stimulated. Too much Pt loading, however, lowers the photocatalytic activity because of the enhanced rate of electron-hole recombination as well as light absorption by platinum. The temperature effect on the reactivity and the reason for the presence of an induction period of the reaction are also elucidated in relation with the band bending of the photocatalyst.

• OSTI ID: 6985890
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:15; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080100 -- Hydrogen-- Production
36 MATERIALS SCIENCE
360600 -- Other Materials
360603 -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000* -- Chemistry
400500 -- Photochemistry
CADMIUM COMPOUNDS
CADMIUM SULFIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN PRODUCTION
INFORMATION
INORGANIC PHOSPHORS
LUMINESCENCE
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
PHOSPHORS
PHOTOCHEMISTRY
PLATINUM
PLATINUM METALS
REDUCTION
SEMICONDUCTOR MATERIALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS