Controlled Synthesis And Hydrogen Evolution Catalysis Research Of MoS₂ Composites

The development of new energy has become a hot research around the world because of the energy crisis and environmental protection requirement, the concept of hydrogen and hydrogen economy began to receive attention. New MoS₂ hydrogen evolution materials gradually attracted people’s attention. Development of nanotechnology and new structures played a crucial role to promote the development of new morphology of inorganic materials, nanoscale MoS₂ has very important applications in the field of electro-catalytic hydrogen evolution. We used different preparation methods to synthesize different morphologies and sizes of MoS₂ and its composite materials by optimize the preparation conditions, expect to obtain stable structure and good performance, as follows:（1） We used ammonium tetrathiomolybdate（ATTM） as precursor, hydroxylamine hydrochloride as reducing agent, [BMIM]BF4 ionic liquids as additives to synthesize a uniform MoS₂ nano-flowers through hydrothermal method. We discussed the effects of reaction temperature, reducing agent, and the amount of ionic liquids on the morphology of the product, and then explored the formation mechanism of MoS₂ nanostructures.（2） MoS₂ of different morphologies was synthesized by Brij58 assisted hydrothermal method, including flower-like and bread-like porous MoS₂. The flower-like MoS₂ was formed by sheet-like structures, Brij58 has a very important modulation effect, and it could significantly control the structure and size of MoS₂ in the synthesis process, also, the type of precursors influences the structure of the product, and we further explored the formation mechanism of flower-like MoS₂. The sheet-like structure was prepared by mixed-solvent liquid exfoliation method, it showed superior catalytic activity compared to bread-like porous MoS₂, it could be applied in the field of cell materials, super capacitors and electrochemical hydrogen evolution.（3） Amorphous MoS3 particles were prepared by a simple electrodeposition method, and then its catalytic activity for hydrogen evolution reaction was tested. Experiments showed that synthetic of amorphous MoS3 was simple and easy to be industrialized, and it has advantages on activity and price. Then MoS3 particles were annealed under different temperatures to make different molybdenum sulphide materials. We tested the catalytic properties of the material and compared to the commercial molybdenum disulfide and amorphous MoS3 particles.（4） C/MoS₂ nanospheres were synthesized by one-step simple hydrothermal method, the characterization results showed that this material had good electro-catalytic activity, which was because carbon materials and layered MoS₂ has electrocatalytic synergistic effect. After 100 cycles these material still had strong stability, indicated that this composite material had good future in battery.