In the Proton Exchange Membrane Fuel Cell (PEMFC), oxygen and water are one of the main reactants and products. Through the electrochemical workstation, the effect of the bipolar plate on the performance of the proton exchange membrane fuel cell after magnetization was studied. The results show that the presence of magnetic field improves the performance of proton exchange membrane fuel cells. On this basis, the difference between magnetic field and performance improvement of proton exchange membrane fuel cells at different temperatures is studied, so as to determine the most suitable magnetic field condition. The operating temperature of a proton exchange membrane fuel cell. In this experiment, the influence of magnetic field on the performance of proton exchange membrane fuel cells under different measurement ratios of cathodes was also explored, and it was concluded that the change of oxygen flow had a great impact on concentration polarization, and when the cathode measurement ratio was 1.8 to approximately 2.0, the magnetic field played a role in promoting the performance of proton exchange membrane fuel cells.
After more than 20 years of development, metamaterials have gradually become an important subject in new material technology since their birth in the early century. As an important part of modern metamaterials, materials with negative Poisson's ratio have been applied in aerospace, military industry, medical and health care, satellite, automobile, ship, transportation and packaging and other fields [1-5]. In this paper, a three-dimensional negative Poisson's ratio structure is designed, and the influence of its structural parameters on mechanical properties is studied through theoretical calculation and simulation. The negative Poisson's ratio performance of three-dimensional negative Poisson's ratio structure in multiple directions makes it promising to be applied in a variety of occasions.
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