The Preparation Of Transition Metal Phosphide Nanocomposite Structures And Their Electrocatalytic Performance For Splitting Water

The development and progress of modern society are inseparable from the development of industry,and the cornerstone of supporting modern industry is inseparable from energy sources such as coal and petroleum.The storage capacity of traditional fossil energy is limited,it is difficult to meet people's desire for sustainable development,and the large-scale consumption of fossil energy has brought serious environmental pollution and greenhouse effect problems.Among them,developing renewable clean energy to replace traditional fossil fuels to achieve sustainable development is currently the most effective method,and hydrogen is a promising clean energy in the 21st century.The current research results show that the ideal electrocatalyst has high reactivity,low initial potential and high current density,indicating that the electrolysis of water is more likely to occur,mainly noble metals and their oxides?such as Pt,Rh,Ir And IrO₂,RuO₂,etc.?.However,due to the low storage capacity of precious metals,the expensive price makes it difficult to apply to actual production.Since the 21st century,two-dimensional materials have attracted a lot of attention due to their unique properties.Because of its large specific surface area,good conductivity and high stability,it has been widely used to form hybrids to support phosphides and sulfides.Therefore,the core research problem of electrolyzed water at this stage is to develop an electrochemical catalyst with low cost and high activity,reduce the over-potential in the reaction process,and improve the chemical stability.This article mainly studies the synthesis and performance of transition metal phosphide electrocatalyst materials,the specific contents are as follows:Firstly,Ni?OH?₂ and Ni?OH?₂/rGO precursors were synthesized by hydrothermal method,and the orthorhombic Ni₂P and Ni₂P/rGO composites were successfully prepared through the high-temperature phosphating process.Modification of the material by loading graphene oxide improves the electron transfer efficiency and promotes the diffusion kinetics of the reaction.Ni₂P/rGO hybrids were obtained by phosphating Ni?OH?₂/rGO precursors at high temperature.It is worth noting that the experimentally synthesized Ni₂P/rGO hybrid can be used as an OER catalyst under alkaline conditions and remains active for more than 12 hours.Its initial potential is 221 mV and the Tafel slope is 105.8 mV/dec,indicating that the synthesized flakes nickel-based phosphide electrocatalyst has good application prospects.Secondly,using hydrothermal method,cubic Co₃O₄ nanoparticles with regular morphology were synthesized,and then through subsequent phosphating process,CoP nanocrystals with similar morphology as Co₃O₄ precursor were successfully synthesized,which can be used as an excellent under alkaline conditions.HER catalyst,by adjusting the phosphating time,explore the catalytic mechanism of CoP nanocrystals.Through its electrochemical test results,the synthesized cobalt phosphide nanocrystals have good HER catalytic performance and stability,with a low initial potential of 87 mV,and a Tafel slope of 105.7 mV/dec,which is stable after 12 hours The performance test can still maintain more than 95.44%of the initial performance,which provides a new way for the preparation and modification of the transition metal-based phosphide electrocatalyst.