| Exploring an efficient and applicable hydrogen power generation technology to replace traditional fossil fuels is crucial to alleviate the energy crisis and environmental pollution.Hydrogen energy is a clean,renewable and efficient energy carrier and chemical resource.Hydrogen production by electrolysis of water is an effective and simple method at present.Hydrogen evolution（HER）and oxygen evolution（OER）are necessary processes for water electrolysis,but their slow kinetics require efficient electrocatalysts.A major challenge is the utilization of highly active precious metal-based catalysts,but limited practical applications due to their high cost and scarcity.Therefore,it is urgent to develop cost-effective electrocatalysts,such as those based on the abundant transition metal materials on Earth.In this paper,through simple hydrothermal method and high temperature calcination method,an electrocatalyst composed of transition metal compounds was constructed for the study of water cracking,the contents are as follows:（1）Firstly,the NF@NiCo（OH）x precursor composite was synthesized by a simple and convenient hydrothermal method.The synthesized NF@NiCo（OH）x precursor composite was calcinated at high temperature in a tube furnace to generate the NF@NCP electrocatalyst of the spindle-like nanoneedle.The electrochemical HER and OER tests were carried out on the prepared electrocatalyst.The HER performance of the obtained NF@NCP was tested in alkaline 1 M KOH solution,and the overpotential required to pass the 100 m A cm-2 current density was 177 m V.Fe-doped vulcanization of the precursor was carried out to obtain a flower-like NF@NCS@F-NS electrocatalyst,which was tested for electrocatalysis.The minimum overpotential of NF@NCS@F-NS through the current density of 100 m A cm-2 was 220 m V.By alkaline simulated seawater,the asymmetric electrode assemble of NF@NCP||NF@NCS@F-NS of electrochemical testing,asymmetric electrode in alkaline simulated seawater system,through the 100m A cm-2 current density,need the minimum voltage of 1.71 V,composed of asymmetric electrode system also has excellent efficiency of Faraday,It also has good stability in alkaline simulated seawater solution（1 M KOH+0.5 M Na Cl）.The use of transition metal-based compounds constructed in this work in electrocatalysis and overall seawater decomposition provides an effective idea for the development of transition metal in hydrogen production by electrolysis of water.（2）A simple hydrothermal method was used to load the pretreated nickel foam material to generate NF@M-CM precursor composite material.The synthesized NF@M-CM precursor composite material was calcinated at high temperature in a tube furnace to generate NF@M-CM/P electrocatalyst.The electrochemical HER and OER tests were carried out on the prepared electrocatalyst.The SHE performance of the obtained NF@M-CM/P was tested in alkaline 1 M KOH solution,and the overpotential required to pass the 100 m A cm-2 current density was 174 m V.The precursor was vulcanized and the obtained NF@M-CM@CS electrocatalyst was tested for electrocatalysis.NF@M-CM@CS passed through the current density of 100 m A cm-2with a minimum overpotential of 257 m V.By alkaline simulated seawater,the asymmetric electrode assemble of NF@M-CM/P||NF@M-CM@CS electrochemical tests,asymmetric electrode in alkaline simulated seawater system,through the 100 m A cm-2 current density,need the minimum voltage of 1.75 V,The composed asymmetric electrode system also has excellent Faraday efficiency and good stability in alkaline simulated seawater solution（1 M KOH+0.5 M NaCl）. |
