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Hybrid Network Sulfonated Polynorbornene/Silica Membranes with Enhanced Proton Conductivity by Doped Phosphotungstic Acid
Author(s) -
He X.H.,
Zheng Y.,
Yao H.L.,
Chen Y.W.,
Chen D.F.
Publication year - 2014
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201300142
Subject(s) - phosphotungstic acid , membrane , nafion , methanol , materials science , conductivity , chemical engineering , doping , casting , polymer chemistry , chemistry , composite material , organic chemistry , catalysis , electrochemistry , biochemistry , optoelectronics , electrode , engineering
A series of novel hybrid sulfonated polynorbornene‐silica (PBN–SiO 2 ) proton conducting membranes doped with different weight ratio of phosphotungstic acid (PWA) were prepared by the casting procedure. The proton conductivity of the composite membranes containing 40 wt.% PWA reached the maximum of 6.1 × 10 –2 S cm –1 and increased gradually with PWA content and temperature elevating, while the methanol permeabilities (3.52–9.39 × 10 –7 cm 2 s –1 ) of these membranes were much lower than that of Nafion 117 (2.36 × 10 –6 cm 2 s –1 ). The membranes also exhibited excellent thermally stable and mechanical properties, which imply that the PBN–SiO 2 –PWA membranes are promising materials in the direct methanol fuel cells (DMFC) applications.