Abstract
Six samples of silica-supported molybdenum disulfide were prepared by decomposition of MOS 3/SiO 2 in argon and hydrogen at 623, 673, and 723 K. The hexagonal MOS 2 structure was confirmed by XRD. ESR analysis showed the presence of Mo 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 2+ in 2 M H 2SO 4, and in photocatalytic studies in the presence of CdS/SiO 2 and TiO 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 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.
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