{"product_id":"crfbiempbi","title":"Polybenzimidazole (PBI) Ion-Exchange Membrane for Redox Flow Battery, CRFBIEMPBI","description":"\u003cp\u003ePolybenzimidazole (PBI) is a high-performance, non-fluorinated thermoplastic that has become a leading alternative to Nafion for Vanadium Redox Flow Batteries (VRFBs).\u003c\/p\u003e\n\u003cp\u003eWhile materials like SPEEK are modified to have negative charges, PBI is a basic polymer. In the acidic environment of a flow battery, the nitrogen atoms in the PBI backbone become protonated, giving the membrane a positive charge. This creates a unique \"Donnan Exclusion\" effect that makes it one of the most selective membranes available. The features of PBI membrane in redox flow battery are shown below:\u003c\/p\u003e\n\u003cp\u003e(1) \u003cstrong\u003eProtonation\u003c\/strong\u003e: The imidazole groups in the PBI backbone (N-H) react with the acid to form positively charged sites.\u003c\/p\u003e\n\u003cp\u003e(2) \u003cstrong\u003eDonnan Exclusion\u003c\/strong\u003e: These fixed positive charges electrostatically repel the positively charged vanadium ions (V2+, V3+, VO2+). \u003c\/p\u003e\n\u003cp\u003e(3) \u003cstrong\u003eIon Transport\u003c\/strong\u003e: While vanadium is repelled, protons (H+) and sulfate anions (HSO4-) can still pass through the polymer's free volume to maintain charge balance.\u003c\/p\u003e\n\u003ctable width=\"100%\" style=\"width: 100%; height: 182.637px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 40.2375px;\"\u003e\n\u003ctd style=\"width: 35.0575%; height: 40.2375px;\"\u003e\u003cem\u003ePart Number\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.7626%; height: 40.2375px;\"\u003e\n\u003cp\u003e\u003cspan\u003eCRFBIEMPBI (C-RFB-IEMPBI)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 35.0575%;\"\u003e\u003cem\u003eChemical Structure\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.7626%;\"\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CRFBIEMPBI_molecular_structure_160x160.png?v=1768589215\" alt=\"\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 35.0575%; height: 35.6px;\"\u003e\u003cem\u003eAppearance\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.7626%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003eYellow\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 35.0575%; height: 35.6px;\"\u003e\u003cem\u003eDimension\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.7626%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003eT 25 um * L 100mm * W 100 mm (Other membrane sizes can be supplied upon request)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 35.0575%;\"\u003e\u003cem\u003eIon Conductivity\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.7626%;\"\u003e\n\u003cp\u003e\u003cspan\u003e\u0026gt; 40 mS\/cm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 35.0575%;\"\u003e\u003cem\u003eVanadium Ion Permeability\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.7626%;\"\u003e\n\u003cp\u003e\u003cspan\u003e\u0026lt;9*10-8 cm2\/min\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 35.0575%;\"\u003e\u003cem\u003eTensile Strength\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.7626%;\"\u003e\n\u003cp\u003e\u003cspan\u003e\u0026gt;40 MPa\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 35.0575%;\"\u003e\u003cem\u003eColumbic Efficiency for VRFBs\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.7626%;\"\u003e\n\u003cp\u003e\u003cspan\u003e\u0026gt;99%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 35.0575%; height: 35.6px;\"\u003e\u003cem\u003ePackage Grade\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.7626%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003e1 pcs\/pack\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReferences\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e(1）\u003ca href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0376738820309376\"\u003eX. Che, et al., Porous polybenzimidazole membranes with high ion selectivity for the vanadium redox flow battery, J. Membrane Sci., 2020, 611, 118359\u003c\/a\u003e. \u003c\/p\u003e\n\u003cp\u003e(2) \u003ca href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S2405829721005936\"\u003eY. Chen, et al., Ion conductive mechanisms and redox flow battery applications of polybenzimidazole-based membranes, Energy Storage Mater., 2022, 45, 595-617.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"ZHCN","offers":[{"title":"Default Title","offer_id":47273891758310,"sku":"CRFBIEMPBI","price":49.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CRFBIEMPBI_main.png?v=1768590132","url":"https:\/\/echemsupplies.com\/products\/crfbiempbi","provider":"EChem Supplies","version":"1.0","type":"link"}