Investigation of proton diffusion in Nafion®117 membrane by electrical conductivity and NMR

Shimon Ochi; Osamu Kamishima; Junichiro Mizusaki; Junichi Kawamura

doi:10.1016/j.ssi.2008.12.035

Investigation of proton diffusion in Nafion^®117 membrane by electrical conductivity and NMR

Shimon Ochi, Osamu Kamishima, Junichiro Mizusaki, Junichi Kawamura

University Research Administration (URA) Center

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

123 Citations (Scopus)

Abstract

The proton dynamics in Nafion ^®117 is investigated by comparison of the diffusion coefficient D_NMR estimated from PFG-NMR with that of D_σ estimated from electrical conductivity. At high water content region, D_σ is about two times higher than D_NMR as a result of Grotthuss mechanism. At low water content region, D_σ and D_NMR are in good agreement with each other. Both of the diffusion coefficients decrease steeply at low water content region. It can be explained as a result of the percolation transition due to the isolation of ion clusters, which is suggested by the recent small angle X-ray scattering data.

Original language	English
Pages (from-to)	580-584
Number of pages	5
Journal	Solid State Ionics
Volume	180
Issue number	6-8
DOIs	https://doi.org/10.1016/j.ssi.2008.12.035
Publication status	Published - 2009 May 14

Keywords

Diffusion coefficient
NMR
Nafion
Percolation transition
Proton conductivity

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/j.ssi.2008.12.035

Cite this

@article{59952a6c618f4e059ac08504072df397,

title = "Investigation of proton diffusion in Nafion{\textregistered}117 membrane by electrical conductivity and NMR",

abstract = "The proton dynamics in Nafion {\textregistered}117 is investigated by comparison of the diffusion coefficient DNMR estimated from PFG-NMR with that of Dσ estimated from electrical conductivity. At high water content region, Dσ is about two times higher than DNMR as a result of Grotthuss mechanism. At low water content region, Dσ and DNMR are in good agreement with each other. Both of the diffusion coefficients decrease steeply at low water content region. It can be explained as a result of the percolation transition due to the isolation of ion clusters, which is suggested by the recent small angle X-ray scattering data.",

keywords = "Diffusion coefficient, NMR, Nafion, Percolation transition, Proton conductivity",

author = "Shimon Ochi and Osamu Kamishima and Junichiro Mizusaki and Junichi Kawamura",

year = "2009",

month = may,

day = "14",

doi = "10.1016/j.ssi.2008.12.035",

language = "English",

volume = "180",

pages = "580--584",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

number = "6-8",

}

TY - JOUR

T1 - Investigation of proton diffusion in Nafion®117 membrane by electrical conductivity and NMR

AU - Ochi, Shimon

AU - Kamishima, Osamu

AU - Mizusaki, Junichiro

AU - Kawamura, Junichi

PY - 2009/5/14

Y1 - 2009/5/14

N2 - The proton dynamics in Nafion ®117 is investigated by comparison of the diffusion coefficient DNMR estimated from PFG-NMR with that of Dσ estimated from electrical conductivity. At high water content region, Dσ is about two times higher than DNMR as a result of Grotthuss mechanism. At low water content region, Dσ and DNMR are in good agreement with each other. Both of the diffusion coefficients decrease steeply at low water content region. It can be explained as a result of the percolation transition due to the isolation of ion clusters, which is suggested by the recent small angle X-ray scattering data.

AB - The proton dynamics in Nafion ®117 is investigated by comparison of the diffusion coefficient DNMR estimated from PFG-NMR with that of Dσ estimated from electrical conductivity. At high water content region, Dσ is about two times higher than DNMR as a result of Grotthuss mechanism. At low water content region, Dσ and DNMR are in good agreement with each other. Both of the diffusion coefficients decrease steeply at low water content region. It can be explained as a result of the percolation transition due to the isolation of ion clusters, which is suggested by the recent small angle X-ray scattering data.

KW - Diffusion coefficient

KW - NMR

KW - Nafion

KW - Percolation transition

KW - Proton conductivity

UR - http://www.scopus.com/inward/record.url?scp=67349108837&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67349108837&partnerID=8YFLogxK

U2 - 10.1016/j.ssi.2008.12.035

DO - 10.1016/j.ssi.2008.12.035

M3 - Article

AN - SCOPUS:67349108837

SN - 0167-2738

VL - 180

SP - 580

EP - 584

JO - Solid State Ionics

JF - Solid State Ionics

IS - 6-8

ER -