PBI TM2 Membrane For Intermediate Temperature PEMFCs

PBI TM2 Membrane with Phosphoric Acid: PBI TM2 membranes are PBI membranes doped with phosphoric acid for high temperature PEM fuel cell or H2 pump applications. Typical application temperature is around 130-180°C depending on the catalyst, electrode, cell and performance requirements. The TM2 membrane is 3-4 mil thick and is available in many sizes. For the convenience of different users, the standard sizes are nominally: 10x10cm, 10x20cm, 20x20cm, 20x30cm, and 30x30cm. Each membrane is packaged individually in a resealable bag with a stiff polyester support layer and polyethylene protective layers on top and bottom. The weight of phosphoric acid in TM2 membrane, if calculated at 85% concentration, is about 4 times (3.5-4.5) the PBI weight. Since the membrane is already doped with acid, it can be used by removing the packaging and positioning it between suitable electrodes. If desired, a small amount of phosphoric acid can be brushed on the catalyst layer of the electrodes before compressing the MEA together to improve the interface. Because TM2 membrane contains phosphoric acid, use caution, and avoid direct contact. Use chemical resistant gloves and tweezers when handling. The polymers in TM2 membrane are meta-Polybenzimidazole as shown below. No PFOA and PFAS - PBI Performance Products doesn’t use Perfluoroalkyl Substances or Polyfluoroalkyl Substances, collectively known as PFAS (which includes Perfluorooctanoic acid, or PFOA), in the manufacture of meta-PBI. Applications that cab benefit from this product: • Intermediate temperature proton exchange membrane fuel cells (160-180 °C) • Intermediate temperature electrochemical hydrogen pumps (160-180 °C) • Intermediate temperature electrochemical hydrogen purification (160-180 °C) • Intermediate temperature electrochemical sensors (160-180 °C) Additional information on Polybenzimidazole materials can be provided and please contact us at sales@fuelcellstore.com email address for your inquiries. The lead time is typically 2-3 weeks for this product.

Membrane Properties

Membrane	Cation Exchange Membrane
Thickness	114 - 124 µm (microns)
Appearance / Color	Transparent / Colorless
Backing Foil	PET Foil
Delivery Form	Dry
Reinforcement	None
Counter Ion	H-form
Density	2.4 mg•cm-2
Selectivity	93 - 94 %
Proton Transfer Rate	6910 µmol•min-1•cm-2
Ion Exchange Capacity	0.88 - 0.91 meq•g-1
Dimensional Swelling in H2O at 25°C	13 - 14 %
Uptake in H2O at 25°C	24 wt %
Non-Std Modulus (MPa)	205 - 218 MPa
Tensile Strength - max. (MPa)	27 - 31 MPa
Yield Strength at 23°C / 50 % R.H.	9 MPa
Elongation to Break (%)	235 - 277 %
Bubble Point Test in Water at 25°C	> 3 bar