Lee, Jeung Woo Lee, Dok Yol Kim, Hyoung-Juhn Nam, Sang Yong Choi, Jong Jin Kim, Ju-Yong Jang, Jong Hyun Cho, EunAe Kim, Soo-Kil Hong, Seong-Ahn Lim, Tae-Hoon 2024-01-20T19:01:19Z 2024-01-20T19:01:19Z 2021-09-05 2010-07-15 0376-7388 https://pubs.kist.re.kr/handle/201004/131255 Polybenzimidazoles (p-PBI and m-PBI) were synthesized by the reaction of 3,3-diaminobenzidine with terephthalic acid or isophthalic acid in polyphosphoric acid at 220 degrees C for 20 h. These PBI membranes were prepared by two methods: conventional casting (post-membrane fabrication) and direct casting (in situ fabrication). Their properties were found to be dependant on their polymer structure as well as the membrane casting method used in the fabrication process. p-PBI demonstrated higher ion conductivity and greater mechanical properties than m-PBI. The membrane produced by the direct casting method resulted in higher ion conductivity than that produced by the conventional casting method. For these reasons, p-PBI membrane formed by a direct casting method promises to enhance the performance of proton exchange membrane fuel cells (PEMFCs). (C) 2010 Elsevier B.V. All rights reserved. English ELSEVIER POLYMER ELECTROLYTE MEMBRANE HIGH-TEMPERATURE-OPERATION FUEL-CELL Synthesis and characterization of acid-doped polybenzimidazole membranes by sol-gel and post-membrane casting method Article 10.1016/j.memsci.2010.04.010 1 JOURNAL OF MEMBRANE SCIENCE, v.357, no.1-2, pp.130 - 133 JOURNAL OF MEMBRANE SCIENCE 357 1-2 130 133 scie scopus 000278905100014 2-s2.0-77952763992 Engineering, Chemical Polymer Science Engineering Polymer Science Article POLYMER ELECTROLYTE MEMBRANE HIGH-TEMPERATURE-OPERATION FUEL-CELL In situ membrane fabrication Membrane electrode assembly Polybenzimidazole Proton exchange membrane fuel cell