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Sol-Gel SiO2-Polymer Hybrid Heteropoly Acid-Based Proton-Exchange Membranes

Published online by Cambridge University Press:  01 February 2011

F. John Pern ,
John A. Turner ,
Fanqin Meng  and
Andrew M. Herring
F. John Pern
Affiliation:
[email protected], National Renewable Energy Laboratory, 1617 Cole Blvd.,, Golden, Colorado, 80401, United States, 303-384-6615
John A. Turner
Affiliation:
[email protected], National Renewable Energy Laboratory, United States
Fanqin Meng
Affiliation:
[email protected], Colorado School of Mines
Andrew M. Herring
Affiliation:
[email protected], Colorado School of Mines
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Abstract

Heteropoly silicotungstic acid (STA)-based, cross-linked hybrid proton exchange membranes for intermediate-temperature (80°-120°C) fuel cell applications were fabricated by incorporating STA in a host matrix of binding silane, SiO2 sol gel, ethylene methacrylate copolymer containing glycidyl methacrylate groups (PMG), and molecular cross-linker. The STA loading level relative to the sum of the PMG and a cross-linker exceeded 100 weight%. Upon curing at 145° under pressure, the composite membranes were nearly 100% cross-linked and were flexible, showed high thermal and chemical stability against Fenton’s reagent, and exhibited a break-in behavior during cyclic voltammetric (CV) scans. The best proton conductivity, which was obtained from CV results, decreased from ∼8-15 mS/cm at 80°C and 100% relative humidity (RH), to ∼1.5 mS/cm at 100°C and 46% RH, and ∼0.25 mS/cm at 120°C and 23%RH.

Keywords

ion-exchange materialcompositefilm
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 885: Symposium A – The Hydrogen Cycle – Generation, Storage and Fuel Cells , 2005 , 0885-A01-10
Copyright
Copyright © Materials Research Society 2006

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