Modeling And Experiment Of PEMFC Performance In A Magnetic Field

Proton exchange membrane fuel cells have received attention from researchers because of their high overall efficiency,less gas pollution and noise,and the ability to work at room temperature.There are many factors that affect the performance of fuel cells.This paper studies the relationship between the magnetic field and the performance of proton exchange membrane fuel cells through theoretical analysis and experimental tests.The main contents are:(1)Starting from the electrochemical reaction rate,three voltage losses of the fuel cell were analyzed.The flow rate related to the concentration loss,the polarization curve related to the activation loss,and the relationship between the exchange film thickness and the ohmic polarization loss were calculated.Proposed the improvement ideas that need to be taken for different loss segments.(2)The main factors that affect the electrochemical reaction of batteries are mass transfer,electrode dynamics,and deposition morphology.Through comprehensive experiments,the performance and AC impedance of the proton exchange membrane fuel cell in a magnetic field environment under different conditions are monitored.The results show that the magnetic field would have a more obvious effect on the fuel cell working with high power density and reduce the impedance of the fuel cell.The stronger the magnetic field is,the more obvious the effect is.As the frequency goes from high to low,the phase difference has a process of decreasing first,then increasing,and finally decreasing again.(3)The relationship between the operating voltage and impedance of the fuel cell is studied.When the voltage is 0.4V and the power density is large,the impedance of the fuel cell is greatly affected by the magnetic field;and when the voltage is 0.7V and 0.2V and the power density is small,the influence of the affected magnetic field to reduce the impedance is also small.When a magnetic field with different intensities is applied,the stronger the magnetic field strength is,the more obvious the effect on the performance parameters of the fuel cell is.(4)The induced magnetic field of the fuel cell was measured.The magnetic field intensity of the fuel cell is approximately 20 ?T in this experiment.The magnetic field intensity was positively correlated with the output current density of the proton exchange membrane fuel cell.In the external magnetic field environment,the induced magnetic field of the fuel cell still has a positive correlation with the current density.From the experimental results in this paper,the operating performance parameters of the battery have been improved after the magnetic field is loaded,and the AC impedance has been reduced.The induced magnetic field of the fuel cell has a strong correlation with the internal operating current density.The research results of this dissertation have a good theoretical research significance and application value for the optimization of battery and the improvement of work performance.