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Title: Structurally Cross-Linked Composite Proton Exchange Membranes

Abstract

Composite proton exchange membranes (PEMs) with a thermally cross-linked polymer backbone for high-temperature fuel cell applications were fabricated by casting tetrahydrofuran solution mixtures of tetraethoxysilane, a functional silane, a proton conductor, a molecular cross-linker (MXL), and an ethylene-methylacrylate copolymer with glycidyl methacrylate groups (PMG). The proton conductors used were commercial Keggin-structured silicotungstic acid (H4SiW12O40-26H2O, W12-STA) and lacunary W10- and W11-STA. The 3D cross-linked membranes were dense with in-situ formed SiO2 nanoparticles and showed high thermal stability, high chemical resistance to the Fenton's reagent, and moderate mechanical strength and flexibility. The corresponding proton conductivity was affected by formulation, membrane quality, loading level of W12-STA, temperature, and relative humidity, and was in the 20-25 mS/cm range at 80 C/100%RH with proton diffusion coefficients of 2.5-3.5 x 10-6 cm/s peaked in the {approx}90-110 C range for PEMs having a loading level of W12-STA >150 wt% (ratio to the weight sum of PMG and MXL).

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
939282
DOE Contract Number:  
AC36-99-GO10337
Resource Type:
Journal Article
Resource Relation:
Journal Name: ECS Transactions; Journal Volume: 5; Journal Issue: 1, 2007
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; CASTING; COPOLYMERS; DIFFUSION; FLEXIBILITY; FUNCTIONALS; HIGH-TEMPERATURE FUEL CELLS; HUMIDITY; MEMBRANES; METHACRYLATES; MIXTURES; POLYMERS; PROTONS; STABILITY; TETRAHYDROFURAN; Solar Energy - Photovoltaics

Citation Formats

Pern, J., Turner, J., Dec, S., Yan, Y., To, B., Lipfert, D., Meng, F., and Herring, A. M. Structurally Cross-Linked Composite Proton Exchange Membranes. United States: N. p., 2007. Web. doi:10.1149/1.2728999.
Pern, J., Turner, J., Dec, S., Yan, Y., To, B., Lipfert, D., Meng, F., & Herring, A. M. Structurally Cross-Linked Composite Proton Exchange Membranes. United States. doi:10.1149/1.2728999.
Pern, J., Turner, J., Dec, S., Yan, Y., To, B., Lipfert, D., Meng, F., and Herring, A. M. Mon . "Structurally Cross-Linked Composite Proton Exchange Membranes". United States. doi:10.1149/1.2728999.
@article{osti_939282,
title = {Structurally Cross-Linked Composite Proton Exchange Membranes},
author = {Pern, J. and Turner, J. and Dec, S. and Yan, Y. and To, B. and Lipfert, D. and Meng, F. and Herring, A. M.},
abstractNote = {Composite proton exchange membranes (PEMs) with a thermally cross-linked polymer backbone for high-temperature fuel cell applications were fabricated by casting tetrahydrofuran solution mixtures of tetraethoxysilane, a functional silane, a proton conductor, a molecular cross-linker (MXL), and an ethylene-methylacrylate copolymer with glycidyl methacrylate groups (PMG). The proton conductors used were commercial Keggin-structured silicotungstic acid (H4SiW12O40-26H2O, W12-STA) and lacunary W10- and W11-STA. The 3D cross-linked membranes were dense with in-situ formed SiO2 nanoparticles and showed high thermal stability, high chemical resistance to the Fenton's reagent, and moderate mechanical strength and flexibility. The corresponding proton conductivity was affected by formulation, membrane quality, loading level of W12-STA, temperature, and relative humidity, and was in the 20-25 mS/cm range at 80 C/100%RH with proton diffusion coefficients of 2.5-3.5 x 10-6 cm/s peaked in the {approx}90-110 C range for PEMs having a loading level of W12-STA >150 wt% (ratio to the weight sum of PMG and MXL).},
doi = {10.1149/1.2728999},
journal = {ECS Transactions},
number = 1, 2007,
volume = 5,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}