Influence of Different Side-groups and Cross-links on Phosphoric Acid Doped Radel-based Polysulfone Membranes for High Temperature Polymer Electrolyte Fuel Cells

Title
Influence of Different Side-groups and Cross-links on Phosphoric Acid Doped Radel-based Polysulfone Membranes for High Temperature Polymer Electrolyte Fuel Cells
Authors
남석우한종희김형준장종현헨켄스마이어디억증 녹 미 한Bhupendra Singh
Keywords
HT PEMFC; Radel; proton conducting membranes; hydroxypyridine; oxydianiline
Issue Date
2017-01
Publisher
Electrochimica acta
Citation
VOL 224-313
Abstract
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/cm2 at 120 °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/cm2 at 800 mA/cm2) showed a 2.5 times higher performance than the previously reported AP-IM based system.
URI
http://pubs.kist.re.kr/handle/201004/65228
ISSN
0013-4686
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