Molybdenum disulfide as a hydrogen evolution catalyst for water photodecomposition on semiconductors

Journal Article · Sun Sep 01 00:00:00 EDT 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90332-X· OSTI ID:5565411

Sobczynski, A ^[1]

---

1. Technical Univ., Poznam (Poland)

Six samples of silica-supported molybdenum disulfide were prepared by decomposition of MoS{sub 3}/SiO{sub 2} in argon and hydrogen at 623, 673, and 723 K. The hexagonal MoS{sub 2} structure was confirmed by XRD. ESR analysis showed the presence of Mo{sup 5+} in all the samples. Electrochemical studies showed that although silica-supported molybdenum disulfide did not manifest any photoresponse, it possessed good hydrogen evolution properties. These properties were confirmed in catalytic studies, in the presence of V{sup 2+} in 2 M H{sub 2}SO{sub 4}, and in photocatalytic studies in the presence of CdS/SiO{sub 2} and TiO{sub 2} as sensitizers and methanol as a sacrificial electron donor. Very high activity of the sample calcined in argon at 623 K is regarded to be caused by its special surface properties connected to the presence of a large quantity of Mo{sup 5+} ions. The reduction of the excess of molybdenum(V) ions by evolving hydrogen is taken into account in the explanation of a long induction period in photosensitized hydrogen production.

• OSTI ID: 5565411
• Journal Information: Journal of Catalysis; (United States), Vol. 131:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
HYDROGEN PRODUCTION
PHOTOLYSIS
MOLYBDENUM SULFIDES
CATALYTIC EFFECTS
WATER
CADMIUM SULFIDES
CATALYST SUPPORTS
CATALYSTS
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
ELECTRON SPIN RESONANCE
METHANOL
SEMICONDUCTOR MATERIALS
SILICA
SULFURIC ACID
SURFACE PROPERTIES
TITANIUM OXIDES
X-RAY DIFFRACTION
ALCOHOLS
CADMIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ACIDS
INORGANIC PHOSPHORS
MAGNETIC RESONANCE
MATERIALS
MINERALS
MOLYBDENUM COMPOUNDS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORS
PHOTOCHEMICAL REACTIONS
REFRACTORY METAL COMPOUNDS
RESONANCE
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
080106* - Hydrogen- Production- Biosynthesis & Photochemical Processes