Radel-based membranes with pyridine and imidazole side groups for high temperature polymer electrolyte fuel cells

Authors
Hink, SteffenNgoc My Hanh DuongHenkensmeier, DirkKim, Jin YoungJang, Jong HyunKim, Hyoung-JuhnHan, JongheeNam, Suk-Woo
Issue Date
2015-07
Publisher
Elsevier BV
Citation
Solid State Ionics, v.275, pp.80 - 85
Abstract
Polysulfone-based membranes with pyridine (PY) side chains, crosslinked by imidazole (IM) groups, are synthesised, doped with phosphoric acid (PA) and characterised in the hydrogen/air fuel cell at 160 degrees C. It is shown that the bisphenol A (BPA) group of Udel P-3500 (Solvay) acts as a breaking point, and Radel R-5000 NT (Solvay)-based membranes, in which BPA is substituted for biphenyl, show superior stability. Undoped membranes show thermal stability of up to 330 degrees C (3% weight loss, 10 degrees C/min, nitrogen). PA-doped membranes: The weight gain during acid doping is limited by the high crosslink density, and independent of the doping temperature. By varying the ratio of pyridine to imidazole units from 2:1 to 9:1, the PA uptake can be controlled between 200 and 500 wt%, respectively. The Young modulus increases with the crosslinking density from 12 to 129 MPa. Proton conductivity of the PY/IM 2:1 membrane at 160 degrees C reaches 59 mS/cm. In the fuel cell, the PY/IM 2:1 membrane achieved a potential of ca. 500 mV at 0.2 A/cm(2). After 430 h (330 h at 02 A/cm(2), then 0.4 A/cm(2)), the cell failed, and postmortem analysis suggested severe chemical degradation. Washing the membrane with ammonia solution before doping increased the stability further. (C) 2015 Elsevier B.V. All rights reserved.
Keywords
DOPED POLYBENZIMIDAZOLE MEMBRANES; AROMATIC POLYETHERS; CROSS-LINKING; DURABILITY; HT PEMFC; Radel; Pyridine; Crosslinked membrane; Phosphoric acid doping
ISSN
0167-2738
URI
https://pubs.kist.re.kr/handle/201004/125300
DOI
10.1016/j.ssi.2015.03.026
Appears in Collections:
KIST Article > 2015
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