Experimental and Theoretical Infrared Spectroscopic Study on Hydrated Nafion Membrane

Raman K. Singh; Keiji Kunimatsu; Kenji Miyatake; Takao Tsuneda

doi:10.1021/acs.macromol.6b00999

Experimental and Theoretical Infrared Spectroscopic Study on Hydrated Nafion Membrane

Raman K. Singh, Keiji Kunimatsu, Kenji Miyatake, Takao Tsuneda^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

53 Citations (Scopus)

Abstract

A collaborative experimental and theoretical study on the dependence of the infrared (IR) spectrum of hydrated Nafion electrolyte membrane on the hydration number is investigated in great detail. Experimental time-resolved attenuated total reflection Fourier transform IR spectroscopic results show that Nafion membrane has a unique IR peak intensity dependence on the hydration number. Calculated IR spectra indicate that this unique IR peak intensity dependence is correctly reproduced not for the singly hydrated Nafion but for the doubly hydrated Nafion. This result strongly supports the relay mechanism of the proton conductance, in which protonated water clusters are relayed by the side chains through the doubly hydrated sulfonic acid groups under low-humidity conditions.

Original language	English
Pages (from-to)	6621-6629
Number of pages	9
Journal	Macromolecules
Volume	49
Issue number	17
DOIs	https://doi.org/10.1021/acs.macromol.6b00999
Publication status	Published - 2016 Sept 13
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/acs.macromol.6b00999

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title = "Experimental and Theoretical Infrared Spectroscopic Study on Hydrated Nafion Membrane",

abstract = "A collaborative experimental and theoretical study on the dependence of the infrared (IR) spectrum of hydrated Nafion electrolyte membrane on the hydration number is investigated in great detail. Experimental time-resolved attenuated total reflection Fourier transform IR spectroscopic results show that Nafion membrane has a unique IR peak intensity dependence on the hydration number. Calculated IR spectra indicate that this unique IR peak intensity dependence is correctly reproduced not for the singly hydrated Nafion but for the doubly hydrated Nafion. This result strongly supports the relay mechanism of the proton conductance, in which protonated water clusters are relayed by the side chains through the doubly hydrated sulfonic acid groups under low-humidity conditions.",

author = "Singh, {Raman K.} and Keiji Kunimatsu and Kenji Miyatake and Takao Tsuneda",

note = "Funding Information: This research was supported by the Research on Nanotechnology for High Performance Fuel Cells (HiPer-FC) and Superlative, Stable, and Scalable Performance Fuel Cell (SPer-FC) projects of the New Energy and Industrial Technology Development Organization (NEDO) of the Japanese Ministry of International Trade and Industry (MITI) and by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Grant 23225001). Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

year = "2016",

month = sep,

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doi = "10.1021/acs.macromol.6b00999",

language = "English",

volume = "49",

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journal = "Macromolecules",

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AU - Singh, Raman K.

AU - Kunimatsu, Keiji

AU - Miyatake, Kenji

AU - Tsuneda, Takao

N1 - Funding Information: This research was supported by the Research on Nanotechnology for High Performance Fuel Cells (HiPer-FC) and Superlative, Stable, and Scalable Performance Fuel Cell (SPer-FC) projects of the New Energy and Industrial Technology Development Organization (NEDO) of the Japanese Ministry of International Trade and Industry (MITI) and by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Grant 23225001). Publisher Copyright: © 2016 American Chemical Society.

PY - 2016/9/13

Y1 - 2016/9/13

N2 - A collaborative experimental and theoretical study on the dependence of the infrared (IR) spectrum of hydrated Nafion electrolyte membrane on the hydration number is investigated in great detail. Experimental time-resolved attenuated total reflection Fourier transform IR spectroscopic results show that Nafion membrane has a unique IR peak intensity dependence on the hydration number. Calculated IR spectra indicate that this unique IR peak intensity dependence is correctly reproduced not for the singly hydrated Nafion but for the doubly hydrated Nafion. This result strongly supports the relay mechanism of the proton conductance, in which protonated water clusters are relayed by the side chains through the doubly hydrated sulfonic acid groups under low-humidity conditions.

AB - A collaborative experimental and theoretical study on the dependence of the infrared (IR) spectrum of hydrated Nafion electrolyte membrane on the hydration number is investigated in great detail. Experimental time-resolved attenuated total reflection Fourier transform IR spectroscopic results show that Nafion membrane has a unique IR peak intensity dependence on the hydration number. Calculated IR spectra indicate that this unique IR peak intensity dependence is correctly reproduced not for the singly hydrated Nafion but for the doubly hydrated Nafion. This result strongly supports the relay mechanism of the proton conductance, in which protonated water clusters are relayed by the side chains through the doubly hydrated sulfonic acid groups under low-humidity conditions.

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ER -

Experimental and Theoretical Infrared Spectroscopic Study on Hydrated Nafion Membrane

Abstract

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