Xergy Dispersions & Solutions
Pention™ dispersions (also known as ionomers) are highly conductive and stable liquid solutions, and therefore useful for incorporation into electrode layers involving anion exchange membranes (AEM). The ionomer structure contains a poly(norbornene) backbone and is sold in either functionalized and non-functionalized forms. The functionalized polymer is sold as a dispersion for use in electrode layers (such as preparing the catalyst inks or slurries for fabrication of catalyzed gas diffusion layers or gas diffusion electrodes, GDEs, etc.) and is functionalized with a quaternary ammonium group. The functionalized polymer is not soluble in conventional solvent systems, so for membrane casting the unfunctionalized polymer is dissolved in an organic solution and must be functionalized after the membrane manufacturing step. The unfunctionalized polymer is sold in the solution form.
“D” in the product name stands for dispersion and “S” in the product name stands for solution. Dispersions are ionically conducting materials and ready to be used in the as received form. Solutions, on the other hand, are currently being supplied in the unfunctionalized form and the products made with the solutions needs to be functionalized in order to make them ionically conductive. Chemical composition of the quaternary ammonium modified poly(norbornene) polymer is provided on the right side.
Pention-D72-5wt% is a quaternary ammonium functionalized dispersion with 5wt% polymer concentration in an organic solvent. This dispersion belongs to D72 series and it has an IEC (meq/g) of 3.45 to 3.55. Dispersion products are highly suitable for electrode manufacturing such as catalyzed gas diffusion layers and other similar products/components.
Hydrophilic order of Pention dispersions as follows: D72 series (the most hydrophilic) >> D35 series >> D18 series (the least hydrophilic). Hydrophobic order of Pention dispersions as follows: D72 series (the least hydrophobic) << D35 series << D18 series (the most hydrophobic). If maintaining the hydration or keeping the water is important for the intended application, then the most hydrophilic dispersion should be used. If removal of the by-product water is important for the intended application, then the intermediate or most hydrophobic dispersion should be used.
Pention™ dispersion (also known as ionomers) products can be used in various electrochemical applications including fuel cells, electrolyzers, sensors, and flow batteries and various other electrochemical applications/technologies. Membranes made with Pention resin have demonstrated the highest recorded AEM fuel cell performance with a peak power density of 3.4 W/cm² (jointly conducted study between NREL, University of South Carolina, and Georgia Institute of Technology). The stated electrochemical performance data is for reference only and depending on the MEA, CCM or GDE manufacturing method, used membrane thickness, testing hardware design and components used in the test hardware, and operational parameters (temperature, pressure, reactant flow rates, etc.), those values may or may not be attained.
• Very high conductivity
• Great chemical stability
• Hydrophilic or hydrophobic natured depending on the selected series of the dispersion products
Pention dispersions are considered hazardous items under DOT and IATA regulation. 125 mL and 250 mL dispersions will incur a hazardous fee to accommodate the regulations based on the final shipping location (which is included in the pricing listed on the Fuel Cell Store product pages).
Please note that Xergy Pention dispersions contain solvents that may compromise the seals of the bottles if the solvents are left in direct contact with the lids for long periods of time. We recommend always storing the bottles in an upright orientation as soon as the shipment is received to lessen the likelihood of inadvertent leakage.
A typical lead time of 2-3 weeks is to be expected.