Titanium Powder Felt
The main process of preparation
Features
- Both pore size and porosity can be controlled;
- Gradient pore structure;
- Large specific surface area;
- Excellent water vapor transmission performance;
- Excellent electrical and thermal conductivity;
- High temperature resistance and thermal shock resistance;
- Medium corrosion resistance;
- Can be welded and machined.
Specific surface area
Sv specific surface area, Ks material constants related to pore-strut characteristics, d pore size, θ porosity.
Relationship between specific surface area and material transfer rate: The larger the specific surface area, the faster the material transfer rate, and the smaller the specific surface area, the slower the material transfer rate.
Schematic diagram of PEM hydrogen production titanium powder felt (TPF)
Advantages
1. Increase the contact area between the gas diffusion layer and the membrane electrode and reduce the contact resistance.
2. Reduce surface spikes to prevent puncturing the membrane electrode and improve the life of the membrane electrode.
3. Excellent water-gas transmission performance.
Application
PEM hydrogen production anode diffusion layer GDL
The anode diffusion layer is used for O2 and H2O mass transfer. It has a high potential and acidic environment and requires a coating with good corrosion resistance. The porous transport layer is located between the catalyst layer and the bipolar plate. As a water supply and gas emission path and an electron transmission path, it directly affects the concentration polarization and ohmic polarization of the water electrolysis reaction. The porous transport layer must have a rich continuous pore structure, which is conducive to the diffusion and transmission of water and precipitated gas, and has good conductivity to reduce ohmic polarization. In a high potential acidic environment, the anode side porous transport layer is generally made of corrosion-resistant titanium porous material, and its surface can be treated with precious metal coating to reduce contact resistance and service life.