分会场

燃料电池发动机

摘要

As a key component of PEMFC, gas diffusion layer (GDL) plays an important role in mass transport process. In this study, the method of layered setting is used to cut the gas diffusion layer along the thickness direction, and the porosity of different layered areas is set to make it have different porosity gradients along the thickness direction. The influence of five porosity gradients of gas diffusion layer on the internal mass transfer process and the performance of fuel cell is studied. It is found that the porosity gradient of the GDL has a great influence on the mass transfer process and the performance of the fuel cell: the porosity gradient of the GDL will affect the effective diffusion coefficient of the internal gas, and the larger porosity gradient will lead to the poor uniformity of the distribution of the gas diffusion transfer process, which is not conducive to the internal mass transfer process of the fuel cell, and reduces the internal electric conductivity of the catalyst layer. When the porosity gradient of the GDL is small, the mass transfer process changes uniformly, the electrochemical reaction rate is high, and the performance of the fuel cell is better. In addition, the change rule of porosity first increasing and then decreasing along the thickness direction of the GDL is more conducive to the fuel cell performance than the change rule of porosity first decreasing and then increasing Therefore, the fuel cell has better performance under the same conditions.

关键词

PEMFC; GDL; Porosity gradient; Mass transport; Fuel cell performance

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