Preparation Of Sulphide Composite Materials Based On Carbon Cloth And Study Of Hydrogen Production From Electrolysis Water

Facing the increasingly serious energy crisis,people devote themselves to developing clean and renewable energy.As a clean,stable hydrogen production method,hydrogen production from the electrolysis of water has attracted more and more attention of researchers in recent years.However,the high electrochemical activation barrier restricts the efficiency of hydrogen evolution from electrolytic water.Noble metal based electrocatalyst which can effectively reduce the overpotential in the process of electrolytic water hydrogen evolution,accelerate the reaction kinetics,and has high conductivity,is one of the most advanced materials used in water electrolysis research.However,the high cost and low content of precious metals limit their largescale application in electrocatalytic processes.Therefore,we urgently need to find a kind of non-noble metal electrocatalytic material with low price and excellent performance to improve the efficiency of hydrogen electrolysis of aquatic products.The main content of this paper mainly includes the following two parts.(1)The MoS2/CuS/CC heterostructure was successfully grown on carbon cloth(MoS2/CuS/CC)through an efficient method.The SEM results confirmed that the fabricated MoS2/CuS/CC composites have a flake morphology,which can not only improve the surface area but also offers ample surface catalytic active sites.Particularly,the optimized MoS2/CuS/CC-2 electrocatalyst showed a small overpotential of 85 mV at 10 mA/cm2 and exceptional long-term cycling durability for hydrogen evolution in 1 M KOH.The outstanding catalytic activity is attributed to the fact that the combination of MoS2 with CuS can greatly enhance the charge transport rate and improve the structural stability.These results suggest that the MoS2/CuS/CC heterostructure is a potential electrocatalyst for hydrogen production.(2)In this work,CuS nanosheets decorated with CoS2 nanoparticles were successfully synthesized through a simple route.In particular,the optimized 3%CoS27%CuS/CC catalyst exhibits outstanding electrocatalytic performance and excellent cycling stability for its hydrogen evolution reaction at all pH values.The CoS2-CuS/CC,pure CoS2 and pure CuS catalysts showed lower Tafel slopes(46 mV/dec,52 mV/dec and 59 mV/dec)and small overpotentials(62 mV,85 mV and 106 mV)in 0.5 M H2SO4,1 M KOH and 0.5 M phosphate buffer at a current density of 10 mA/cm2,The high activity of the as-prepared catalyst is attributed to its unique heterostructure and synergistic effect between metal sulfides,which provides a large interfacial contact area,numerous charge transfer channels and abundant surface reactivity.thereby enhancing transfer of charge carriers during electrochemical hydrogen evolution activity.