Study On Properties Of Electrolytic Aquatic Hydrogen Based On Nickel Based Phosphide Sulfide Heterostructure Composite

Hydrogen production by electrolysis of water is one of the methods to produce green hydrogen using clean electricity.However,the sluggish kinetics of anode OER and cathode HER in the system will lead to excessive voltage required for the reaction.Therefore,it is necessary to develop and prepare efficient electrocatalytic materials to Accelerates the reaction kinetics during the electrolysis of water.In this context,non-precious metal-based OER and HER bifunctional catalytic materials are highly valued and are expected to be used for the large-scale production of green hydrogen in the future.On this basis,this thesis takes transition metal phosphide and sulfide electrocatalytic materials as the research object,and applies chemical methods such as hydrothermal and low-temperature phosphating for doping and morphology control.The main research results are as follows:（1）Construction of NiCoP@NiCoS composite nanomaterials:First,the NiCo-LDH nanoneedle structure was prepared with NF as the substrate,phosphating in a tube furnace,and then hydrothermally vulcanized to obtain NiCoP@NiCoS/NF nanomaterials.The electrocatalytic performance was improved to varying degrees in both alkaline HER and OER(HER:82m V@10m Acm^-2,OER:343m V@50m Acm^-2),which was due to the synergistic effect of heteroelements between S and P,resulting in More interfacial effects promote water splitting,and the roughened material surface also increases the contact interface with the reaction solution,improving the catalytic performance.（2）Design of Fe-NiCoP/NF composite electrocatalytic system:Fe-NiCoP/NF nanomaterials were obtained by secondary hydrothermal doping and phosphating on NiCo-LDH nanowire structures.Compared with Fe-doped materials,the overpotential of the electrocatalytic reaction was reduced in alkaline HER and OER(HER:116m V@10m Acm^-2,OER:281m V@50m Acm^-2),and the secondary hydrothermal doping of Fe catalysis The material increases the active sites,maintains the original morphology,improves the electron transport ability and the synergistic effect of doping atoms,and enhances the water splitting performance.（3）Construction and performance research of Ru-CoFeP/NF composite nanomaterials:adding NaOH to the Co Fe-LDH material to change its morphology and structure,soaking RuCl₃ solution at room temperature to load Ruelement,and then phosphating to obtain Ru-CoFeP/NF composite electrocatalytic material,the electrocatalytic performance of the composite system is effectively improved in alkaline HER and OER(HER:88m V@10m Acm^-2,OER:288m V@50m Acm^-2),indicating that the NaOH-modified after the Ru-CoFeP/NF is loaded with Ru,more active sites can be obtained,and the larger surface area makes the reaction more rapid and improves its catalytic performance.In this paper,a composite material with excellent electrocatalytic performance using different non-precious metals as raw materials was prepared by a simple chemical synthesis method,and it has good stability.The above research provides a basis for the production of electrocatalytic materials with general applicability.