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Study of the variation of the ionic channel network in a proton exchange membrane under hydration by using current-sensing atomic force microscopy

Title
Study of the variation of the ionic channel network in a proton exchange membrane under hydration by using current-sensing atomic force microscopy
Authors
Kwon, O.[Kwon, O Sung]Lee, T.D.[Lee, Tae Dong]Lee, Y.W.[Lee, Young Wook]Kim, J.G.[Kim, Joo Gon]
DGIST Authors
Kim, J.G.[Kim, Joo Gon]
Issue Date
2015
Citation
New Physics: Sae Mulli, 65(4), 303-310
Type
Article
Article Type
Article
Keywords
Current-Sensing Atomic Force MicroscopyIonic Channel NetworkProton-Exchange MembraneProton-Exchange Membrane Fuel Cell (PEFMC)
ISSN
0374-4914
Abstract
Proton exchange membranes (PEMs) are being used as gas separators, insulating electrodes, and proton conductors. Thus, understanding the morphological structure of a PEM is one of the important issues for the characterization of a proton exchange membrane fuel cell (PEMFC). Specifically, the variation in the ionic channel network under hydration of a PEM is a crucial issue. In this study, we characterized the variation in the ionic channel network of Nafion 112 under a hydrated condition by using a current-sensing atomic force microscope (CSAFM). We built a mini-sized PEMFC by using the Pt-coated tip of a CSAFM and a PEM coated with Pt/C on one side. The mini-sized PEMFC could detect the local proton conductivity of the ionic clusters in the PEM. We measured the local proton conductivity of ionic clusters by using a mini-sized PEM under different relative humidities. The results were characterized by using the ballistic transport model and revealed several crucial trends, such as increasing proton conductivity and proton mean free path with increasing relative humidity.
URI
http://hdl.handle.net/20.500.11750/2356
DOI
10.3938/NPSM.65.303
Publisher
Korean Physical Society
Files:
There are no files associated with this item.
Collection:
Convergence Research Center for Wellness1. Journal Articles


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