Study On The Effect Of Magnetic Field On Hydrogen Production By PEM With Small Platinum Load

To achieve the goal of"two carbons",the development of circular green technology is an inevitable trend,hydrogen energy has advantages in solving the problems of abandoning wind,electricity,and water,and the technology of hydrogen production by electrolysis of water has received widespread attention.Proton exchange membrane(PEM)water electrolysis hydrogen production technology has the advantages of low energy consumption and high purity compared with alkaline electrolysis water hydrogen production technology and solid oxide electrolytic cell hydrogen production technology and has become an important development direction of water electrolysis hydrogen production.Due to the excellent catalytic performance of platinum,the use of platinum electrodes in PEM hydrogen production has the best electrolytic hydrogen effect,and platinum metal is expensive,which limits its application in PEM hydrogen production.External fields such as magnetic fields and sound fields will also strengthen PEM hydrogen production.To reduce the cost of the catalyst and improve the energy efficiency of hydrogen production,a Pt-Ni composite hydrogen evolution electrode with a trace platinum load based on nickel foam was prepared by electrochemical deposition,and a magnetic field coupled electric field was used to improve the hydrogen production efficiency.Based on the analysis of PEM hydrogen production theory and magnetic field mechanism,the hydrogen evolution effect of Pt-Ni composite hydrogen evolution electrode deposited with nickel foam as the substrate was studied by the experimental method,and the influence of different magnetic field conditions on PEM hydrogen production.Five different Pt-Ni composite catalytic hydrogen evolution electrodes with platinum/nickel mass ratios of 1:7,1:11,1:12,1:14,and 1:23 were prepared by electrochemical deposition.Scanning electron microscope,X-ray diffractometer(XRD),and X-ray spectrometer(XPS)were used to characterize the morphology,structure,and elemental composition of the electrodes,and the results showed that the 1:12 composite electrode had a porous structure with uniform deposition and stable performance,and had higher bonding energy than the nickel foam electrode.The electrochemical workstation was used to test the linear scanning voltammetry(LSV)curve,cyclic voltammetry(CV)curve,electrochemical impedance(EIS)curve,and calculated the Tafel slope and electrochemical active area(ECSA),and the electrochemical performance analysis showed that the Pt-Ni composite electrode with a platinum/nickel ratio of 1:12 had the best catalytic effect on hydrogen evolution.Electrochemical analysis and experimental methods were used to study the hydrogen production effect of PEM under the action of magnetic field.The electrochemical workstation was used to test the influence of magnetic fields with different magnetic induction intensities on the catalytic performance of hydrogen evolution,and the cathodic polarization curve,Tafel curve,chronograph current curve,and current-time curve were analyzed and tested.The results show that the magnetic field can promote hydrogen evolution catalysis.The stronger the magnetic field,the stronger the catalytic hydrogen evolution performance,the higher the current density,the lower the hydrogen evolution potential,and the better the stability of the magnetic field.A PEM hydrogen production device with a magnetic field coupled with an electric field was built.The magnet placement method and magnetic field strength have obvious effects on the hydrogen evolution effect.When the magnetic field N electrode is in the electrolytic cathode,the magnetic field S electrode is in the electrolytic anode,the magnetic field strength is 0.1T,the pure water-electrolyte temperature is 70°C,the electrolysis hydrogen production efficiency is the highest at 87.25%,the average hydrogen production efficiency is 81.91%,the average hydrogen production per unit area is 12.32ml/(h?cm~2),minimum power consumption per unit volume of hydrogen production is 3.99k W?h/m~3,and the average power consumption is4.29k W?h/m~3;when the electrolyte temperature is 60°C,The average hydrogen production efficiency of 0.2T magnetic induction magnetic field is 10.80%higher than that without magnetic field,and 0.1T is 3.11%higher than that without magnetic field.The experimental results of PEM show that the magnetic field has a facilitating effect on PEM hydrogen production,improving the efficiency of electrolytic hydrogen production and hydrogen production per unit area,and effectively reducing the power consumption and electrolysis voltage.The best mass ratio of Pt and Ni of Pt-Ni composite catalytic electrode with nickel foam as the base is given and the influence of magnetic field on PEM hydrogen production is analyzed experimentally,which provides basis and guidance for the practical application of PEM hydrogen production technology.