MOF-derived Metallic Phosphide Carbon Electrocatalysts For Hydrogen Evolution Reaction

With the continuous development of human society,the demand for energy is also increasing.The ensuing problems are increasingly serious environmental pollution and energy crisis,so a large number of researchers are working to find clean and renewable energy.Natural gas is considered to be an ideal and clean"future energy".Electrocatalytic hydrogen evolution reaction?HER?is one of the efficient ways to prepare gas phase.It is unstable and cannot be commercialized.Therefore,it is the main task in this field to explore controllable,cheap to prepare,efficient and durable,and environmentally friendly hydrogen evolution catalysts.First,we prepared the Fe₃O₄/C material as a precursor by calcination,and then successfully prepared the FeP/C catalytic material by phosphating,and compared the electrocatalytic performance tests at 400?,450?,and 500?respectively.The results show that the FeP/C catalytic material prepared at the calcination temperature of 450?has the best performance.When the current density in the system is-50 mA·cm^-2,the overpotential is-191.7 mV;the current density is-10 mA·cm^-2,the overpotential is-145.1 mV,Tafel is obliquely incident at 49.9mV·dec^-1,and has a small Rct.By using hydrothermal method and normal temperature and pressure method to prepare Fe/Co bimetallic metal organic framework?MOFs?material as a precursor,and then subjected to high temperature pyrolysis and phosphating means,successfully prepared bimetallic phosphide carbon material,replacing XRD,SEM,TEM and XPS were used to characterize the structure and composition of the material,and the electrochemical performance of the electrode was evaluated by cyclic voltammetry curve,cross curve,slope of Tafel curve,cyclic stability and AC impedance spectroscopy.The phosphating temperature was 350?,and the Fe and Co mass ratios were 1:1,2:1,and 3:1,respectively.The catalytic materials were prepared and the electrochemical performance of the materials was tested.The results showed that the reaction occurred when the Fe and Co mass ratio was 2:1.The synthesized FeCoP/NPC composite has the best catalytic performance.When the current density is-10 mA·cm^-2,the overpotential is-136.8 mV,the Tafel slope is 60.8 mV·dec^-1,and the electric double layer capacitance reaches 30 mF·cm^-2.In addition,the catalytic materials were prepared when the mass ratio of Fe and Co was 2:1,and the phosphating temperature was 280?,300?,and 350?,respectively.The results showed that the optimal electrochemical performance was as follows when the phosphating temperature was350?.The Fe/Co mass ratio is 2:1 and the synthesized materials have the best electrochemical performance when the phosphating temperature is 350?.