Singh, Bhupendra Ngoc My Hanh Duong Henkensmeier, Dirk Jang, Jong Hyun Kim, Hyoung Juhn Han, Jonghee Nam, Suk Woo 2024-01-20T02:32:33Z 2024-01-20T02:32:33Z 2021-09-05 2017-01 0013-4686 https://pubs.kist.re.kr/handle/201004/123256 In previous work we tested the potential of Radel based membranes for use in the high temperature polymer electrolyte fuel cell (HT PEMFC), using aminoyridine (AP) and imidazole (IM) as phosphoric acid (PA) binding and crosslinking group, respectively. In this work we developed the system further by comparing AP with hydroxypyridine (HP) and IM with oxydianiline (OX). The use of OX leads to reduced PA uptake, probably due to higher reactivity, increasing the density of crosslinks. HP leads to an increased PA uptake, clearly above 300 wt% for HP-IM membranes. Conductivity correlates well with the PA uptake, and HP-IM membranes showed the highest ion conductivity, 18 mS/cm(2) at 120 degrees C and fully anhydrous conditions. The logarithmic value of the Young modulus, plotted against the PA uptake, shows a linear behavior, independent of the functional groups. In comparison to previous work, the slope is smaller, demonstrating that it is possible to shift the trade-off relation into a more beneficial range. In the fuel cell test, HP-IM membranes showed the best performance. Based on the peak power density, the HP-IM based system (294 mW/cm(2) at 800 mA/cm(2)) showed a 2.5 times higher performance than the previously reported AP-IM based system. (C) 2016 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD Influence of Different Side-groups and Cross-links on Phosphoric Acid Doped Radel-based Polysulfone Membranes for High Temperature Polymer Electrolyte Fuel Cells Article 10.1016/j.electacta.2016.12.088 1 ELECTROCHIMICA ACTA, v.224, pp.306 - 313 ELECTROCHIMICA ACTA 224 306 313 N scie scopus 000392165800037 2-s2.0-85006300352 Electrochemistry Electrochemistry Article PROTON-EXCHANGE MEMBRANES SULFONATED POLYBENZOTHIAZOLES PBI-OO POLYBENZIMIDAZOLE POLYBENZOXAZOLE CONDUCTIVITY TETRAZOLE PYRIDINE HT PEMFC Radel proton conducting membranes hydroxypyridine oxydianiline