Krishnan, N. Nambi
Henkensmeier, Dirk
Jang, Jong Hyun
Kim, Hyoung-Juhn
Rebbin, Vivian
Oh, In-Hwan
Hong, Seong-Ahn
Nam, Suk-Woo
Lim, Tae-Hoon
2024-01-20T17:01:54Z
2024-01-20T17:01:54Z
2021-09-05
2011-06
0360-3199
https://pubs.kist.re.kr/handle/201004/130317
Fuel Cell operation at high temperature (e.g. 120 degrees C) and low relative humidity (e.g. 50%) remains challenging due to creep (in the case of Nafion) and membrane dehydration. We approached this problem by filling PES 70, a sulfonated poly(ether sulfone) with a T-g of 235 +/- 5 degrees C and a theoretical IEC of 1.68 mmol g(-1), with 5-20% silica nano particles of 7 nm diameter and 390 +/- 40 m(2) g(-1) surface area. While simple stirring of particles and polymer solutions led to hazy, strongly anisotropic (air/glass side) and sometimes irregular shaped membranes, good membranes were obtained by ball milling. SEM analysis showed reduced anisotropy and TEM analysis proved that the nanoparticles are well embedded in the polymer matrix. The separation length between the ion-rich domains was determined by SAXS to be 2.8, 2.9 and 3.0 nm for PES 70, PES 70-S05 and Nafion (R) NRE 212, respectively. Tensile strength and Young's modulus increase with the amount of silica. Ex-situ in-plane proton conductivity showed a maximum for PES 70-S05 (2 mS cm(-1)). In the fuel cell (H-2/air, 120 degrees C, <50%), it showed a current density of 173 mA cm(-2) at 0.7 V, which is 3.4 times higher than for PES 70. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
English
PERGAMON-ELSEVIER SCIENCE LTD
PROTON CONDUCTING MEMBRANES
COMPOSITE MEMBRANES
PERFORMANCE
COPOLYMERS
OPERATION
SYSTEMS
CHALLENGES
PEMFCS
PEMS
ACID
Sulfonated poly(ether sulfone)-based silica nanocomposite membranes for high temperature polymer electrolyte fuel cell applications
Article
10.1016/j.ijhydene.2011.03.015
1
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.36, no.12, pp.7152 - 7161
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
36
12
7152
7161
scie
scopus
000291628500022
2-s2.0-79955895811
Chemistry, Physical
Electrochemistry
Energy & Fuels
Chemistry
Electrochemistry
Energy & Fuels
Article
PROTON CONDUCTING MEMBRANES
COMPOSITE MEMBRANES
PERFORMANCE
COPOLYMERS
OPERATION
SYSTEMS
CHALLENGES
PEMFCS
PEMS
ACID
High temperature PEMFC
Sulfonated poly(ether sulfone)
Silica nanoparticle
Silica nanocomposite membrane
SAXS