Preparation Of Nano Phosphide Electrode And Study On Hydrogen Production By Electrolysis Of Water

Nowadays,all countries in the world suffer from the puzzle of energy shortage,so the development of new energy has become more and more important.Among the abundant new energy sources,hydrogen fuel has been widely recognized due to its unique advantages,including abundance,high calorific value and no harm for environment of combustion product.In recent years,with the great breakthroughs of hydrogen energy in the automobiles fields,the technology of hydrogen fuel cell vehicles also has been developed rapidly.Moreover,the stability and working cycle,as well as the cost efficiency of hydrogen fuel cell have been all improved greatly.Therefore,the development of hydrogen energy is of great significance to the hydrogen fuel cell industrial.Among all kinds of hydrogen production methods,water electrolysis which composes with the hydrogen evolution reaction?HER?and oxygen evolution reaction?OER?,has been gained more and more attention due to its simplicity,practicability and environmental friendless.However,the low efficiency of the two reaction leads to the high cost of water electrolysis,which seriously restricts the development of water electrolysis industrial.Nowadays,the water electrolysis still need noble metal catalysts to improve the efficiency and reduce the cost of water electrolysis.But the high price of precious metals is contrary to the original intention of cost saving.Therefore,a series of studies on transition metal phosphides have been carried out in this paper,in order to reduce the high cost of catalytic electrode materials of water electrolysis industrial.The specific research is as follows:?1?Co_0.5Fe_0.5P nanoparticle catalysts were successfully synthesized by hydrothermal synthesis and low temperature phosphating.The electrochemical test results show that the catalysts exhibit excellent catalytic performance and stability in alkaline electrolyte?1M KOH solution?.When the current density arrive at 10mA cm^-2,the overpotential for hydrogen evolution reaction?HER?and oxygen evolution reaction?OER?are 230 mV and 493 mV,respectively.?2?The carbon nanotubes?CNT?is used as substrate.Through the hydrothermal and low-temperature phosphating,the Co_0.5Fe_0.5P nanoparticles were loaded onto the CNT to prepare the Co_0.5Fe_0.5P nanoparticles/CNT composite catalyst(donated as Co_0.5Fe_0.5P-P/CNT).The electrochemical results showed that the overpotentials for HER and OER of the catalyst were220 mV and 419 mV respectively in alkaline electrolyte?1M KOH solution?at the current density of 10 mA cm^-2.?3?By NaBH₄ in-situ reduction,CoFe alloy nanoclusters were directly riveted on the CNT to reduce the size of CoFe alloy clusters.Then through the low temperature phosphating,the Co_0.5Fe_0.5P nanocluster/CNT composite catalyst(donated as Co_0.5Fe_0.5P-C/CNT)was successfully prepared.This catalyst exhibited excellent HER and OER properties.In alkaline electrolyte?1M KOH solution?,the overpotential for HER and OER of the catalytic electrode were 185 mV and 350 mV,respectively,at the current density of 10 mA cm^-2.