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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/14270

Title: Interfacial Structure and Proton Conductivity of Nafion at the Pt-deposited Surface
Authors: Ono, Yutaro
Nagao, Yuki
Keywords: Interfacial Structure
Proton Conductivity
Nafion
Pt-deposited Surface
pMAIRS
Issue Date: 2015-12-10
Publisher: American Chemical Society
Magazine name: Langmuir
Volume: 32
Number: 1
Start page: 352
End page: 358
DOI: 10.1021/acs.langmuir.5b02623
Abstract: Understanding the Nafion-Pt interface structure is important because fuel cell reactions occur at the three-phase boundary. Infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (p-MAIRS) technique was used to investigate the in-plane (IP) and out-of-plane (OP) spectra in the identical substrate. Our previous study revealed that the proton conductivity of the Nafion thin films decreased at the MgO and SiO_2 surfaces. We proposed that the origin for the lower proton conductivity can be derived from the highly oriented structure at the interface. However, the interface structure of the Nafion-Pt interface remains unclear. In this study, Nafion thin films were prepared by spin-coating on a Pt-deposited MgO substrates. The IP spectrum exhibited a well-known spectrum, but the OP spectrum was quite differed considerably from the IP spectrum. Furthermore, thickness dependence of the degree of orientation for this OP band was observed at the Nafion-Pt interface. This OP band can be assigned as the vibration mode of the mixture of the CF_2 and sulfonic acid groups. At the low-RH region, proton conductivity of the Nafion thin film on the Pt-deposited surface was one order of magnitude higher than that on the SiO_2 surface. Furthermore, the activation energy was 0.4-0.5 eV, which is lower than that of the SiO_2 surface. These results, which suggest that the Pt surface influenced the proton transport property of Nafion thin film, can contribute to understand the relationship between the proton transport property and thin film structure on the Pt-deposited surface at the three-phase boundary for fuel cells.
Rights: Yutaro Ono and Yuki Nagao, Langmuir, 2015, 32(1), pp.352-358. This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in Langmuir, copyright (c) American Chemical Society after peer review. To access the final edited and published work, see http://dx.doi.org/10.1021/acs.langmuir.5b02623
URI: http://hdl.handle.net/10119/14270
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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