Research On Synthesis Of Nano- Molybdenum Sulfide/graphene Aerogels And Its Adsorption And Hydrogen Evolution Properties

Graphene aerogel,as an attractive graphene-derived nanomaterial with three-dimensional?3D?porous structure,has been widely prospected in energy storage,environmental restoration,flexible devices and photo-electrochemistry.On the other hand,MoS₂ as a typical layered transition metal dichalcogenide?TMDs?exhibited 2D layer structure similar to graphene,and has been widely explored.Recently,with the development of eco-friendly energy,the combination of MoS₂ and 3D porous graphene aerogel has been a research hotpot,and is potential to be used to solve the environmental contamination and energy crisis.In this paper,the uniformly dispersed MoS₂ nanoflowers with the 1T/2H multiphase was in-situ synthesized on reduced graphene oxide?MoS₂/rGO?aerogel via one-step hydrothermal route.The macroscopic morphology,microstructure of as-prepared MoS₂/rGO aerogels were studied in detailed,as well as the adsorption and electrocatalysis performance.The main research contents are shown as following:?1?The MoS₂/rGO hybrid aerogels was successfully synthesized via a facile one-step hydrothermal method with the assistant of ammonium hydroxide?NH₃·H₂O?.It can be found that the oxygen-containing functional group on the surface of graphene oxide?GO?plays a vital role in the uniform growth of MoS₂ nanoflowers.The effects of the reaction parameters including hydrothermal temperature,the doping amount of graphene oxide,the precursor,and ammonium hydroxide on the structure and morphology of the composite aerogels were investigated.The hybrid aerogels structure effectively inhibited agglomeration and stacking of MoS₂ and graphene layers,and thereby optimizing the morphology and structure.As a result,the morphology and structure of the MoS₂/rGO-10 aerogels with the graphene oxide doping amount of 10 wt%and the hydrothermal conditions at 180°C,in which MoS₂ nanoflowers sphere about 300 nm in diameter has a 1T/2H multiphase,a few-layered structure and uniformly dispersed on the graphene layer via the C-O-Mo bonds.?2?The MoS₂/rGO hybrid aerogels nanostructure and morphology were significantly optimized.The adsorption performance of MoS₂/rGO hybrid aerogels for organic compounds were investigated by using 200 mg/L methylene blue?MB?aqueous solution as the model probe.The optimized MoS₂/rGO aerogels present a good dispersibility and stability,and exhibiting excellent adsorption performance.The adsorption capacity of MoS₂/rGO-10 hybrid aerogels reached 280 mg/g,which was obviously improved compared with the pure MoS₂?189 mg/g?.?3?In the MoS₂/rGO hybrid aerogels structure,rGO aerogel acts as a catalyst carrier for MoS₂,in which the highly uniformly dispersed 1T/2H MoS₂ nanoflowers by bonds interacted with rGO layers.This excellent heterostructure of the hybrid aerogels has abundant active site density,high electrical conductivity and structural stability.As electrocatalyst,the unique 3D MoS₂/rGO porous aerogels have a superior performance in hydrogen evolution reaction?HER?applications with a small Tafel slope 40 mV/decade,onset overpotential of 130 mV,large current density of 268.5 mA/cm² at?=300 mV,the C_DII up to 208 mF/cm² and long-term stability.This study potentially provides new avenues for designing more efficient stability non-noble-mental hybrid catalysts for hydrogen evolution reaction.