Study On Electrocatalytic Performance Of Plasma Surface Treatment Of Metal Sulfide

In recent years,transition metal-based materials with high earth content,such as carbides,nitrides,oxides,phosphides,and sulfides have become new electrocatalytic materials.Through a series of studies on alloys based on Ni/Co/Fe materials,it is proved that some of these materials have strong electrocatalytic activity to HER.Among these catalysts,nickel-based nanomaterials were found to be effective electrocatalysts for HER.Therefore,in this paper,foam nickel is used as the base material,the corresponding precursor material is prepared by hydrothermal method,and then the precursor is prepared into a new composite nanomaterial by enhanced chemical vapor deposition(PECVD)technology.A class of nickel-based transition metal materials with good structural stability and good morphology has been developed to achieve efficient hydrogen production from electrolyzed water with excellent electrocatalytic performance.Based on the above technical route,two nickel-based transition metal electrocatalysts were prepared in this paper,and the electrochemical performance of hydrogen evolution from electrolyzed water was tested.The experimental contents and research results are as follows:1.The precursor Ni(OH)2/NF was grown in situ on the surface of nickel foam by hydrothermal synthesis,and the single metallic sulfur NiS2-Ni(OH)2/NF was further prepared on the surface of Ni(OH)2/NF by PECVD method.By means of XRD,XPS,SEM,TEM characterization can be known that the material is a single wafer array with a thickness of 90 nm,with greater specific surface area and the number of active sites exposed,thus,NiS2-Ni(OH)2/NF prepared in this study has excellent electrocatalytic activity in both acidic and alkaline environments.The research results were obtained by electrocatalytic hydrogen evolution experiment:At the current density of 10 mA/cm2,the hydrogen evolution overpotential was only 93 mV and 95 mV under acidic and alkaline conditions,and the Tafel slope was 80 mV/dec and 83.5 mV/dec,respectively,while maintaining good electrochemical stability.2.Bimetallic sulfide NiCo2S4/NF was prepared by one-step hydrothermal synthesis of the precursor NiO-CoO/NF and vulcanization of the precursor through PECVD.By XRD,XPS,SEM and TEM characterization,NiCo2S4/NF microspheres with rough surface morphology were obtained,which provided favorable conditions for the increase of specific surface area and the number of active sites exposed,As a hydrogen evolution electrode under acidic and alkaline conditions,only 74 mV and 80 mV could provide HER with the current density of 10 mA/cm2,and the Tafel slope was only 89 mV/dec and 64 mV/dec,which was superior to the electrocatalytic performance of the above-mentioned monmetallic sulfide to a large extent.The above research shows that,while pursuing the enhancement of catalytic activity,we have designed a novel and simplified preparation method for heterogeneous composite nanomaterials.Through regulating variables and controlled experiments,the hydrogen evolution performance of electrolytic water of the prepared material was repeatedly verified,which provided valuable insights for the development of efficient HER catalysts.