Effect of ethylenediaminetetraacetic acid on the photocatalytic activities and flat-band potentials of cadmium sulfide and cadmium selenide

Journal Article · Thu Jan 11 04:00:00 EST 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100364a069· OSTI ID:6663979

Uchihara, Toshio ^[1]; Matsumura, Michio; Ono, Junichi; Tsubomura, Hiroshi ^[2]

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1. Univ. of the Ryukyus, Okinawa (Japan)
2. Osaka Univ. (Japan)

Photocatalyzed hydrogen evolution on Pt-loaded CdS powder from aqueous solutions of sodium sulfite is enhanced by addition of a small amount of ethylenediaminetetraacetic acid (EDTA) to the solution. EDTA is hardly consumed by the reaction. It has been concluded from the measurements of the flat-band potential of CdS electrodes that EDTA and other chelating agents, such as 1,2-cyclohexanediaminetetraacetic acid and nitrilotriacetic acid, are adsorbed strongly on the surface of CdS and shift the conduction band energy toward the negative. The enhancement of the photocatalytic hydrogen evolution by the addition of EDTA is explained as being caused by the upward shift of the conduction band energy of CdS due to the negative charge of the chelating agents. The change of the conduction band energy by the adsorption of EDTA is observed also for CdSe electrodes. Although Pt-loaded CdSe powder is inactive for the hydrogen evolution from aqueous solutions of sodium sulfite, it generates hydrogen when EDTA is added to the solution.

• OSTI ID: 6663979
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:1; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080100 -- Hydrogen-- Production
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
AMINO ACIDS
CADMIUM COMPOUNDS
CADMIUM SELENIDES
CADMIUM SULFIDES
CARBOXYLIC ACIDS
CATALYSIS
CHALCOGENIDES
CHELATING AGENTS
CHEMISTRY
DATA
DATA ANALYSIS
EDTA
ELEMENTS
ENZYMES
EXPERIMENTAL DATA
HYDROGENASES
INFORMATION
INORGANIC PHOSPHORS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDOREDUCTASES
PHOSPHORS
PHOTOCHEMISTRY
PLATINUM
PLATINUM METALS
SELENIDES
SELENIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS