Incorporation of benzimidazolium ionic liquid in proton exchange membranes ABPBI-H3PO4
摘要:
This paper presents the development of proton exchange membranes (PEM) from the incorporation of poly (2,5-benzimidazole) (ABPBI) in phosphoric acid (H3PO4) and ionic liquid (IL) 1-butyl-3-ethylbenzimidazolium dihydrogen phosphate (BEBzIm-H2PO4). We show structural, physicochemical and electrochemical characterization of synthesized IL and prepared membranes. The addition of IL in composite membranes of ABPBI-H3PO4 increases thermal stability. Also, the conductivity of membranes increases with temperature and the amount of absorbed mixture. Conductivity at a range of 10(-4) S/cm was achieved at 150 degrees C by 50% IL and 50% phosphoric acid impregnation. This conducting composite membrane shows promise for operation in temperature proton exchange membrane fuel cells at working temperatures up to 100 degrees C. (C) 2013 Elsevier B.V. All rights reserved.