Synthesis Of Bi(poly)metal Compounds Based On Ni And Fe And Their Application In Electrocatalytic Decomposition Of Water

Nowadays,fossil fuels are depleted,environmental problems are lit up,and environmental pollution,energy crisis,and energy storage accompanying social development are imminent.The realization of sustainable development is still the first goal we are pursuing.At present,the use of electrolyzed water to convert hydrogen energy is an effective way.However,the oxygen evolution reaction(OER)in electrolyzed water becomes a rapid step due to its slow kinetics,resulting in energy conversion.The efficiency is low.Based on the above background,the design of excellent and reasonable OER electrocatalyst has become a hot research topic.Layered double hydroxide(LDH),as an intercalation material,Its positively charged laminate and interlayer anion composition are balanced.and its material composition and electronic structure are large.Regulatory.At present,NiFe-LDH materials based on transition metals are important research objects in recent years.In addition,transition metal phosphides(TMPs)are expected to replace precious metal catalysts due to their excellent electrocatalytic performance,probably because of their more active sites.In addition,transition metals have many types,low prices,abundant reserves,and can be regulated.The preparation process conditions,morphology,composition,electrochemical properties,etc.were characterized.This paper mainly studies the following contents:In the first part,the transition metal NiFe-LDH was prepared by the optimal conditions of hydrothermal synthesis: Ni/Fe=3:1,reaction temperature 120?,reaction time 12 h.Then,by low-temperature phosphating,the structure of the catalyst is changed,and a bimetallic phosphide is prepared to overcome the disadvantage of poor conductivity of NiFe-LDH,and a nickel-iron phosphide having excellent electrochemical properties is prepared by modification.The second part is based on the preparation of the above transition metal NiFe-LDH.In order to pursue better OER activity,a third metal is introduced into the NiFe-LDH model to form a Ni-Fe-M trimetal hydroxide.Based on the above idea,using phosphomolybdic acid as the molybdenum source and phosphorus source,based on foamed nickel with rich specific surface area,excellent structure and good conductivity,NiFeMo(P)-LDH/NF was prepared by simple hydrothermal synthesis at 80? for 12 h.Its shape is a uniform,three-dimensional petal-shaped sheet structure,The addition of Mo to the prepared NiFeMo(P)-LDH/NF has a much higher electrochemical performance than NiFe-LDH/NF and has excellent stability.