NDLI: Comprehensive strategy to design highly ordered mesoporous Nafion membranes for fuel cells under low humidity conditions

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Junrui Zhang, Jin Pan, Mu Tang, Haolin Jiang, San Ping
Copyright Year	2014
Abstract	A comprehensive strategy has been developed to synthesize highly ordered mesoporous Nafion membranes with different structure symmetries including 2D hexagonal (2D-H), 3D face-centered (3D-FC), 3D cubic-bicontinuous (3D-CB) and 3D body-centered (3D-BC), using a soft template method with the assistance of a silica colloidal mediator. The Nafion membrane derived from the self-assembled mesoporous Nafion–silica composites maintained the microstructures of the silica framework, which was confirmed by small angle X-ray scattering (SAXS) and TEM. The in situ time-resolved synchrotron SAXS clearly indicates that the presence of silica colloids is critical for the formation of the highly ordered mesoporous structured phase in the precursor solution. The best results are observed on Nafion membranes with 2D-H structure in terms of proton conductivity and cell performance under reduced relative humidity (RH) conditions, achieving proton conductivities of 0.08, 0.062 and 0.038 S cm−1 at 100, 40 and 0%RH, respectively. Moreover, the power output of the mesoporous Nafion membrane cells show a S-shaped dependence on RH and are stable under anhydrous conditions (i.e., 0% RH), demonstrating the outstanding high water retention capability of the mesoporous structure of the membranes.
Starting Page	20578
Ending Page	20587
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	2
Issue Number	48
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta02722a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Mesoporous material Nafion Dimension Silicon dioxide Small-angle X-ray scattering Transmission electron microscopy Synchrotron Proton Relative humidity Correlation and dependence
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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