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Morphological characterization of sulfonated graphene and Nafion composite membrane by dynamic mode atomic force microscopy

Title
Morphological characterization of sulfonated graphene and Nafion composite membrane by dynamic mode atomic force microscopy
Authors
Kwon, OsungPark, SamKim, Joo GonSon, ByungrakLee, Dong-Ha
DGIST Authors
Son, Byungrak; Lee, Dong-Ha
Issue Date
2015-10-10
Citation
International Journal of Energy Research, 39(12), 1698-1713
Type
Article
Article Type
Article
Keywords
AFMAtomic Force MicroscopyCharacterizationComposite MembranesDMAFMFuel CellFuel CellsFunctionalized GrapheneGrapheneMembranesMorphological CharacterizationMorphological VariationNafion Composite MembranesPEMProton-Exchange MembraneProton-Exchange Membrane Fuel Cells (PEMFC)Surface Roughness
ISSN
0363-907X
Abstract
Maintaining proper hydration in the proton exchange membrane (PEM) is a crucial issue for passive air breathing PEM (ABPEM) fuel cells. The inorganic filler Nafion composite membrane has great potential for replacing commercialized PEM for ABPEM. We synthesize sulfonated graphene and Nafion composite membrane by using functionalized graphene to enhance the water content in the membrane. We analyze morphological variation of a sulfonated graphene-Nafion composite membrane by using dynamic mode atomic force microscopy (DMAFM). The phase map and topography of the sulfonated graphene-Nafion composite membrane were simultaneously studied for systematic characterization. Through characterization, we find that the water content on the composite membrane has increased remarkably and that it is related to the morphological variation after the composition. In the composite membrane, the root-mean-squared surface roughness has increased compared with pristine Nafion because of the sulfonated graphene. In the DMAFM study, the composite membrane shows an entirely different phase map than the pristine Nafion. The elliptical domains, which have positive phase lags, are created on the composite membrane surface. The creation of these domains reflects the existence of a repulsive interaction between the tip and sample surface because of an increasing adhesive force between the tip and sample. © 2015 John Wiley & Sons, Ltd.
URI
http://hdl.handle.net/20.500.11750/5164
DOI
10.1002/er.3380
Publisher
Wiley Blackwell
Related Researcher
Files:
There are no files associated with this item.
Collection:
Convergence Research Center for Wellness1. Journal Articles


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