High-temperature proton exchange membranes based on polybenzimidazole and clay composites for fuel cells

  1. Get@NRC: High-temperature proton exchange membranes based on polybenzimidazole and clay composites for fuel cells (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.memsci.2011.08.038
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Journal titleJournal of Membrane Science
Pages7887; # of pages: 10
SubjectAcid doping; Clay composites; Clay modification; Fuel cell tests; High temperature; Hydrogen bondings; Hydrogen permeability; I-V performance; Inorganic cations; Ion exchange reactions; Laponite clay; Membrane swelling; Monomer units; Polybenzimidazole; Proton exchange membranes; Pyridinium salts; Room temperature; Transparent composites; Water uptake; X-ray photoelectrons; Ammonium compounds; Clay; Composite membranes; Dimensional stability; Electric conductivity; Hydrogen; Infrared spectroscopy; Ion exchange; Mechanical permeability; Membranes; Open circuit voltage; Protons; Tensile strength; Proton exchange membrane fuel cells (PEMFC); ammonia; benzimidazole derivative; cation; laponite; polybenzimidazole; polymer; pyridinium derivative; silicate; unclassified drug; article; artificial membrane; clay; conductance; high temperature; hydrogen bond; infrared spectroscopy; ion exchange; priority journal; tensile strength; water transport; X ray photoelectron spectroscopy
AbstractGood dispersion of modified laponite clay was achieved in polybenzimidazole (PBI) solutions which, when cast and allowed to dry, resulted in homogeneous and transparent composite membranes containing up to 20wt% clay in the polymer. The clay was organically modified using a series of ammonium and pyridinium salts with varying polarity and hydrogen-bonding capacity. Clay modification by ion-exchange reactions involving replacement of interlayer inorganic cations was confirmed using X-ray photoelectron and infrared spectroscopy techniques. The cast PBI membranes were characterized by their water uptake, acid doping and swelling, tensile strength, conductivity and hydrogen permeability as well as by fuel cell tests. For the composite membranes, high acid doping levels were achieved with sufficient mechanical strength and improved dimensional stability or reduced membrane swelling. At an acid doping level of 12mol H 3PO 4 per monomer unit, proton conductivity as high as 0.12Scm -1 was obtained at 150°C and 12% relative humidity. The composite membranes exhibited hydrogen permeability ranging from 0.6 to 1.2×10 -10molcm -1s -1bar -1 from 100 to 200°C, which was five times lower than that of acid-doped pristine PBI membranes. In accordance with the hydrogen permeability measurements, fuel cell tests exhibited high open circuit voltages (i.e., 1.02V) at room temperature as well as high I-V performance compared with normal PBI membranes. © 2011 Elsevier B.V.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute (IMI-IMI)
Peer reviewedYes
NPARC number21271501
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Record identifierc6ea5a11-ca78-4787-85fe-e228f149a5fa
Record created2014-03-24
Record modified2016-05-09
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