Interfacial band structure of platinum-loaded CdS powder and its correlation with the photocatalytic activity

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Journal of the Electrochemical Society; (USA)

DOI:https://doi.org/10.1149/1.2096996· OSTI ID:5213172

Matsumura, M; Uchihara, T; Hanafusa, K; Tsubomura, H ^[1]

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1. Osaka Univ., Suita (Japan). Faculty of Engineering

The band structure near the surface of the Pt-loaded CdS photocatalyst is discussed. The height of the energy barrier existing at the CdS/Pt interface was experimentally derived by analyzing the temperature dependence of the cathodic current flowing in the Pt-loaded CdS sinter electrode. The barrier at the CdS/solution interface was obtained from the measurement of the flatband potential of CdS electrodes. It turned out that these two barriers have unequal heights, which are advantageous for the photocatalytic reactions. The pH and the temperature effects on the photocatalytic hydrogen evolution from aqueous solutions of sodium sulfite are discussed using this band model. Marked enhancement of the reaction rate by addition of a small amount of EDTA to the solution is reported. This is concluded to be due to the shift of the flatband potential of CdS toward the negative potential.

• OSTI ID: 5213172
• Journal Information: Journal of the Electrochemical Society; (USA), Journal Name: Journal of the Electrochemical Society; (USA) Vol. 136:6; ISSN 0013-4651; ISSN JESOA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
ALKALI METAL COMPOUNDS
ALLOYS
AMINO ACIDS
AQUEOUS SOLUTIONS
CADMIUM COMPOUNDS
CADMIUM SULFIDES
CARBOXYLIC ACIDS
CATALYSTS
CATHODES
CHALCOGENIDES
CHELATING AGENTS
CHEMICAL REACTION KINETICS
DATA
DIFFUSION BARRIERS
DISPERSIONS
EDTA
ELECTRODES
EXPERIMENTAL DATA
INFORMATION
INORGANIC PHOSPHORS
INTERFACES
KINETICS
MIXTURES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORS
PHOTOCATHODES
PLATINUM ADDITIONS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
POWDERS
REACTION KINETICS
SODIUM COMPOUNDS
SODIUM SULFATES
SOLUTIONS
SULFATES
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE