International Journal of Hydrogen Energy, Vol.45, No.23, 13090-13100, 2020
Bis-imidazolium functionalized self-crosslinking block polynorbornene anion exchange membrane
Anion exchange membranes (AEMs) are widely studied as an important component of fuel cells. In this paper, series self-crosslinking AEMs are obtained by copolymerization of the prepared bis-imidazolium functionalized ionic liquids. The block copolymer shows excellent thermal stability with a decomposition temperature (Td) of 300 degrees C. And the mechanical properties of AEMs in OH- are significantly improved due to the crosslinking of epoxy groups. The transmission electron microscopy (TEM) test results show a good microscopic phase separation structure and form ion channels in the membranes, which is benefited to ions conductivity. The OH- conductivity of AEMs is measured as above 2410(-3) Scm(-1) and 9510(-3) Scm(-1) at 30 degrees C and 80 degrees C, respectively. In addition, the AEMs also exhibits excellent swelling performance, the highest is only 20.86% at 80 degrees C. And the conductivity of all AEMs remained above 90% after being immersed in 1M NaOH aqueous at 60 degrees C for 250 h. The peak power density of the AEMs reaches 207.95 mW cm(-2) at current density of 403 mA cm(-2). (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.