Proton conductive composite membrane of phosphosilicate and polyvinyl alcohol

Jin, Yonggang, Diniz da Costa, João C. and Lu, G. Q. (2007) Proton conductive composite membrane of phosphosilicate and polyvinyl alcohol. Solid State Ionics, 178 13-14: 937-942. doi:10.1016/j.ssi.2007.04.005


Author Jin, Yonggang
Diniz da Costa, João C.
Lu, G. Q.
Title Proton conductive composite membrane of phosphosilicate and polyvinyl alcohol
Journal name Solid State Ionics   Check publisher's open access policy
ISSN 0167-2738
Publication date 2007-05-31
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.ssi.2007.04.005
Open Access Status DOI
Volume 178
Issue 13-14
Start page 937
End page 942
Total pages 6
Editor J. Maier
Place of publication Amsterdam
Publisher Elsevier Science Bv
Language eng
Subject 290603 Membrane and Separation Technologies
C1
660501 Energy transformation
Abstract Proton conductive composite membranes were prepared by dispersing phosphosilicate colloidal particles into a polyvinyl alcohol (PVA) matrix. The synthesized membranes were flexible with film thickness between 80 and 200 gm. SEM micrographs show that the phosphosilicate particles are homogenously dispersed, whilst the PVA crosslinks with the inorganic phase and fills in the gaps between the particles. Proton conductivity increases by several orders of magnitude with increasing humidity, reaching a maximum of 0.02 S/cm at ambient temperature and 100% relativity humidity (RE). The activation energy is reduced to 7.3 kJ/mol with RH increasing to 90% in the tested temperature range 2070 degrees C. From structural characterization and conductivity measurements, it is deduced that proton transport occurs by both the Grotthuss and diffusion mechanisms. The methanol permeability was found 5-10 times lower than Nation 117. The composite membrane was tested in the direct methanol fuel cell (DMFC). The preliminary results show the membrane is a promising candidate for PEM for use in DMFC systems. (C) 2007 Elsevier B.V. All rights reserved.
Keyword Chemistry, Physical
Physics, Condensed Matter
organic-inorganic composite
phosphosilicate gel
polyvinyl alcohol
proton conductivity
methanol permeability
DMFC
Fuel-cell Applications
Sol-gel Process
Water/vapor Management
Polymer Electrolyte
Hybrid Membranes
Phosphoric-acid
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Tue, 19 Feb 2008, 00:24:43 EST