Synthesis Of Disulphide Nanoparticles As Highly Active Electrocatalysts For Hydrogen Evolution Reaction

Hydrogen energy is the best candidate to replace fossile fule.Electrochemical hydrogen evolution is the main method to generate hydrogen.Among the many materials,platinum group metal is the optimal catalyst for hydrogen evolution reaction.However,the high price restricts the wide use of platinum group metal.As a result,we focus on synthesizing non-metal materials with high activity and stability.The disulphides(Mo S2 and WS2)which has layered structure resembling graphene are supposed to be a decent electrocatalysts for hydrogen evolution reaction.The main content of this article is to load the Mo S2 and WS2 on carbon-based materials as our electrocatalysts and study their activity for hydrogen evolution reaction.1.We utilized a facile and mild hydrothermal method and synthesized a series of MWCNTs@MoxW1-xS2 as electrocatalysts for hydrogen evolution reaction.TEM,XRD and XPS was used to characterize these electrocatalysts.We studied the influence of the capacity of Mo0.54W0.46S2 on MWCNTs and different molar mass of Mo and W on the activity of electrocatalysts.Finally,it was found that MWCNTs@Mo0.54W0.46S2(the capacity of Mo0.54W0.46S2 is 77.3 %)exhibited the best cativity for hydrogen evolution reaction with a small onset potential of-0.15 V vs.RHE and Tafel slope of 65 m V dec-1.At the same time,this electrocatalyst exhibited excellent activity for hydrogen evolution reaction in acid solution.2.We used a lyophilization method to evenly grow Mo S2 quantum dots on the graphene sheets and gained the electrocatalyst Mo S2 QDs@GS.Mo S2-based electrocatalysts with different morphologies and Mo S2 QDs@GS with different molar mass of Mo S2 QDs and graphene were also synthesized.And we used TEM,XRD and XPS and many other electrochemical measurements to characterize our electrocatalysts.The results showed that Mo S2 QDs@GS3:1 exhibited the best activity toward hydrogen evolution reaction with an onset potential of-0.094 V vs.RHE and large cathode current.According to the above research,it is confirmed that we have synthesized the electrocatalysts with amounts of active sites and excellent activity toward hydrogen evolution reaction with these two methods,including low onset potentials,small Tafel slopes and large cathode current,which has brought promising future for the research on the non-noble metal cathodic electrocatalysts.