چكيده به لاتين
Todays, PEM fuel cells are at the center of attention of the researchers due to their major role in the transportation system in the field of new propulsion vehicles, especially in fuel cell vehicles. PEM Fuel Cells have advantages such as high power density, low temperature performance, high efficiency, low emissions, readily available geometries, and fast startup.
However, fundamental research is inevitable in order to overcome the challenges faced toward commercialization. One of the important issues in the research and development of polymer fuel cells is the effect of the structure of the cathode electrode on its performance.
The purpose of this study was to investigate the effect of cathode electrode structure, such as the thickness of the gas diffusion layer, the carbon fiber diameter, the number of carbon fibers in the volume (porosity), the effect of compression of the gas diffusion layer, and the effect of hydrophobic materials (such as PTFE with binder for bonding between carbon fibers) on the flow density in the cathode electrode catalyst layer, the distribution of mass fraction of oxygen and water vapor in the gas diffusion layer. In addition, in the current simulations, an electrochemical reaction in the catalyst layer is also considered.
By producing geometry and 3D simulation, the effects of the above mentioned can clearly be seen on the performance of PEM fuel cell. Finally, the results of this study indicate that the cathode electrode structure has a significant effect on the performance of PEM fuel cell. The results of this study show the significant effect of cathode electrode structure on PEM fuel cell performance. In the investigation of the diameter of the carbon fibers, the porosity and the thickness of the gas diffusion layer, the results show the low impact of carbon fibers on the electrical current density, while the thickness and porosity of the carbon paper gas penetration layer have a significant effect. In examining the density of the gas diffusion layer, the results show that the application of the density reduces the distribution of oxygen and increases the distribution of accumulated water vapor near the surface of the catalyst layer. In the study of the effect of additives in a cathode, such as a highly hydrophobic material such as PTFE or a binder between carbon fibers, the highest average density electric current density occurs when the distribution Highly non-uniform with a glue value of 70%.
