Preparation Of Molybdenum Disulfide-based Photoelectric Materials And Their Performance

Haze weather has been more and more common in our nation,which has a great influence on our lives and work,threatening the health of human kind.Five development concepts:Innovation,Coordination,Green development,Opening up,and Sharing are put forward in the Fifth Plenary Session of the Eighteenth Central Committee of the Communist Party of China,and Green development has been referred to national strategic height.As a result,it is worthwhile to develope new materials and apply them to our life.As a typical 2D layerd material,MoS₂ has received extensive research in catalysis,photoelectronics and energy harvesting.The present paper focuses on the optimizing of MoS₂ by loading and doping,in order to find the application in photocatalyst and supercapacitor.In the second chapter,the promotion effects of MoS₂ to CdS was mainly studied.Firstly,CdS nanorods were synthesized by the controll agent,ethidene diamine.Afterward,in order to load the MoS₂nanosheets on the surface of CdS nanorods to form the CdS@MoS₂heterosturcture,sodium molybdate and thiourea were taken as the source of Mo and S,respectively.Finally,structural characterization and performance test were measured to have a wide understanding.For the sake of optimized hydrogen production,a series of MoS₂ molar ratios were prepared.What's more,comparing with the Pt loaded CdS,CdS@MoS₂ showed a better hydrogen production.Compared with pure CdS,CdS@MoS₂ has a better hydrogen production.However,it is far from industrialized application because of it's low activity and stability.Transition metal ions,such as cobalt and nickel ions(Co²⁺,Ni²⁺),are widely used as promoters to enhance MoS₂ catalysis of the sulfur removal from oil fractions in the hydrogengeneration industry,which is expected to increase the population of unsaturated atom sites along the MoS₂ edges.Hence,in order to expose more unsaturated atom sites for the improvation of the promotion effects of MoS₂,transition metal ions doped MoS₂ were fabricated in the third chapter.It is revealed that loading Co?Ni?MoS nanosheets on the surface of CdS nanorods is an effective way for photocatalytic hydrogen production,reaching 24 mmol h^-1 g^-1 with the optimized ratio.In addition,CdS@NiMoS heterojunction exhibited an excellent stability after one week test in the hydrogen production system.Supercapacitors,a new energy store device between traditional capacitor and chemical battery,possess high power density,reversibility and long cycling life.The MoS₂ nanosheet possesses a large specificsurface area and interlayer space for the ion intercalation,andhas a wide range of oxidation states from Mo²⁺to Mo⁶⁺in theredox reaction.In the fourth chapter,3D nickle foam?NF?was taken as the base.Ag particals were loaded on the surface of NF to improve the electrical conductivity.So as to fabricate the MoS₂ loaded Ni₃S₂nanowires on the surface of NF?NF@Ag@NiMoS?,thiourea and ammonium molybdate were taken as the source of S and Mo.Charge-discharge test found that NF@Ag@NiMoS has a excellent specific capacitance and stability.