O'Reilly logo

PEM Fuel Cells by Ken S. Chen, Yun Wang

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

6.2 MULTIPHASE FLOW IN GDLS/CLS

Both GDLs and CLs are porous media consisting of the solid matrix and pore network. When liquid water emerges in the pore space, it hinders gaseous reactant supply to the catalyst sites. Under severe conditions, electrode “flooding” (which refers to the pore space being filled up with liquid water) occurs, causing material degradation and efficiency reduction. To facilitate water drainage, the porous materials are usually rendered hydrophobic by adding nonwetting chemicals such as polytetrafluoroethylene (PTFE, a.k.a. DuPont’s Teflon™). Figure 6-2 shows the two common GDL materials: carbon paper and carbon cloth, which exhibit different structures of the solid matrix.

Figure 6-2. Microscopic images of (a) carbon ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required