Experimental Study On The Effect Of Operating Parameters On The Operation Characteristics Of PEMFC

Proton exchange membrane fuel cell(PEMFC)is a device that can directly convert chemical energy into electrical energy,with fast start-up,high power density,low noise,no pollution and other characteristics.PEMFC often exhibit different operating characteristics under different operating parameters.In this paper,the effect of operating parameters on the output characteristics of proton exchange membrane fuel cell is investigated by experimental tests.Conducting a series of experimental operations on PEMFC with changes in operating parameters relies on a test system with the ability to control and monitor changes in different operating parameters.The reliability of the PEMFC test system directly affects the accuracy of the experimental test process.This paper analyzes the test conditions and subsystem functions of PEMFC single cell and electric stack test system in order to ensure that the durability,safety and data control and acquisition accuracy of the test system meet the test requirements and a single cell PEMFC and a 5k W water-cooled PEMFC reactor were prepared for the experiment,which provided a reliable guarantee for the subsequent experiments.PEMFC steady-state output characteristics are affected by changes in operating parameters.Experiment on self-designed PEMFC single cell using PEMFC single cell test system to study the effect of changing operating parameters on PEMFC steady state output voltage and power density.The experimental results show that the steady-state performance of PEMFC is significantly improved in the high current density region when the operating temperature is increased from 50? to 70?,while the steady-state performance of PEMFC decreases sharply when the operating temperature is increased to 80? due to membrane electrode dehydration.At a low cathode overdose coefficient,PEMFC shows poor steady-state performance due to fuel shortage.After PEMFC obtains a normal overdose coefficient,the air overdose coefficient continues to increase and the steady-state performance of the battery improves more significantly.Increased cathode inlet humidity and back pressure both improve PEMFC steady state output performance.To study the effect of different operating parameters on the dynamic response characteristics of the PEMFC variable loading process in view of the downstream phenomenon of the dynamic response voltage during PEMFC loading.In this paper,a water-cooled PEMFC electric reactor is experimented using a PEMFC electric reactor test system to analyze the dynamic response time and downshift of PEMFC electric reactor after changing load under different operating parameters.The experimental results show that the greater the current loading amplitude,the greater the dynamic voltage undercurrent of the PEMFC stack,the longer the corresponding response time,and the maximum undercurrent is more than 40%.The optimum operating temperature for the electric reactor to exhibit good dynamic performance is 70°C.The cathode-anode excess coefficient has a strong influence on the dynamic performance of the electric reactor,where the air excess coefficient is 1.5 and the voltage undercut reaches 15%.The dynamic performance under different cathode-anode humidity is compared,and the cathode-unhumidified has a greater effect on the voltage dynamic performance.Increasing the backpressure can improve the dynamic response performance of the electric reactor,but the boost is not significant.