High Porosity Titanium Fiber Felt

Product Code: 40050011

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This is a high porosity sintered titanium fiber felt with good electrical conductivity.  Titanium fiber felts are primarily used in standard PEM electrolyzers as the flow field or diffuser material, particularly on the oxygen (anode) side.  Since electrolyzer hardwares cannot use carbon-based gas diffusion layers (GDLs) at the anode because the carbon will immediately oxidize to CO2 (if the medium is acidic) or carbonate ions (if the medium is basic) during the reaction. Titanium fiber felt becomes an ideal candidate as the diffusion medium. Titanium fiber felt also provides electrical contact between the anode catalyst layer and bipolar plate or current collector at the anode side

Our titanium fiber felts are produced from small-diameter titanium fibers that has been compressed and flattened, then annealed (i.e., sintered).  This ensures a smooth, flat surface suitable for use in electrolyzers.

While most industrial applications operate their PEM electrolyzers in the anode-fed mode and this product makes an excellent diffusion medium for the oxygen evolution electrode, it can also be used as an ideal diffusion medium for researchers conducting cathode-fed PEM electrolyzer research.

For unitized fuel cells or electrolyzers or regenerative electrochemical devices systems, titanium fiber felt can be used at anode or cathode as the diffusion medium.  Electrochemical oxygen concentrators, electrochemical inerters, certain classes of batteries (such as redox flow batteries) can also benefit from this product as the diffusion medium regardless of the nature of the reactants.

When Should I use a Platinized Titanium Fiber Felt?
Untreated titanium fiber felt will not be consumed like a carbon Gas Diffusion Layer (GDL) will.  However, the presence of oxygen does have an impact if the electrolyzer is being operated at high pressures (1 bar to 3 bars).  The untreated titanium surface will quickly form an electrically insulated oxide layer (TiO2) on the surface of the of the small-diameter fibers under high O2 pressures. This oxide coating will eventually affect the efficiency of the overall system acting as an electrical insulator and it will increase the interfacial resistance in the cell, lowering the electrochemical performance.  

The forming of this oxide coating can be prevented by applying a gold or platinum coating.  The surface platinization of titanium generates a coating that is electrically conductive and chemically stable under regular electrolysis conditions. Thereby, extending the lifetime of the titanium, which is ideal for applications that demand high performance and long lifetime.  Prevention of the formation of TiO2 will greatly stabilize the electrochemical performance of the electrolyzer or the intended electrochemical device.

Specifications of Titanium Fiber Felt:

• Porosity: ~70-73%
• Thickness: 0.2-0.3 mm (uncompressed height)
• Dimensions: Various sizes available.

This product is usually available as in-stock item, otherwise the lead times will be around 4-6 weeks.

Gas Diffusion Layer Properties
Porosity approximately 70-73%

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