Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7707641 | International Journal of Hydrogen Energy | 2018 | 10 Pages |
Abstract
For polymer electrolyte membrane (PEM) fuel cells, the pore structure and small effective diffusion coefficient (EDC) of the catalyst layers have significant impact on the cell performance. In this study, both the pore structure and EDC of the catalyst layers are investigated experimentally; the pore structure of the catalyst layer is characterized by the method of standard porosimetry, and the EDC is measured by a modified Loschmidt cell for oxygen-nitrogen mixture through the catalyzed electrodes. It is found that Pt loading has a direct impact on the pore structure and consequently the EDC of the catalyzed electrodes. As the Pt loading is increased, the porosity and mean pore size of the catalyzed electrode decrease, and the EDC decreases accordingly, however, it is increased by 15-25% by increasing the temperature from 25 °C to 75 °C. The EDC of the catalyst layer is about 4.6 Ã 10â7 m2 sâ1 at 75 °C, compared with 25.0 Ã 10â7 m2 sâ1 for the uncatalyzed electrode at the same temperature.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jian Zhao, Samaneh Shahgaldi, Ibrahim Alaefour, Song Yang, Xianguo Li,