Proton Transport in Hierarchical-Structured Nafion Membranes: A NMR Study

Hengrui Yang; Jin Zhang; Jingliang Li; San Ping Jiang; Maria Forsyth; Haijin Zhu

doi:10.1021/acs.jpclett.7b01557

Proton Transport in Hierarchical-Structured Nafion Membranes: A NMR Study

Hengrui Yang, Jin Zhang, Jingliang Li, San Ping Jiang, Maria Forsyth, Haijin Zhu^*

^*Corresponding author for this work

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

12 Scopus citations

Abstract

It is known that hierarchical structure plays a key role in many unique material properties such as self-cleaning effect of lotus leaves and the antifogging property of the compound eyes of mosquitoes. This study reports a series of highly ordered mesoporous Nafion membranes with unique hierarchical structural features at the nanometer scale. Using NMR, we show for the first time that, at low RH conditions, the proton in the ionic domains migrates via a surface diffusion mechanism and exhibits approximately 2 orders of magnitude faster transport than that in the nanopores, whereas the nanopores play a role of reservoir and maintain water and thereby conductivity at higher temperature and lower humidities. Thereby creating hierarchical nanoscale structures is a feasible and promising strategy to develop PEMs that would enable efficient electrochemical performance in devices such as fuel cells, even in the absence of high humidity and at elevated temperatures.

Original language	English
Pages (from-to)	3624-3629
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	8
Issue number	15
DOIs	https://doi.org/10.1021/acs.jpclett.7b01557
State	Published - 3 Aug 2017
Externally published	Yes

Access to Document

10.1021/acs.jpclett.7b01557

Cite this

@article{2207773b09924cbea0eb8333e5920c58,

title = "Proton Transport in Hierarchical-Structured Nafion Membranes: A NMR Study",

abstract = "It is known that hierarchical structure plays a key role in many unique material properties such as self-cleaning effect of lotus leaves and the antifogging property of the compound eyes of mosquitoes. This study reports a series of highly ordered mesoporous Nafion membranes with unique hierarchical structural features at the nanometer scale. Using NMR, we show for the first time that, at low RH conditions, the proton in the ionic domains migrates via a surface diffusion mechanism and exhibits approximately 2 orders of magnitude faster transport than that in the nanopores, whereas the nanopores play a role of reservoir and maintain water and thereby conductivity at higher temperature and lower humidities. Thereby creating hierarchical nanoscale structures is a feasible and promising strategy to develop PEMs that would enable efficient electrochemical performance in devices such as fuel cells, even in the absence of high humidity and at elevated temperatures.",

author = "Hengrui Yang and Jin Zhang and Jingliang Li and Jiang, {San Ping} and Maria Forsyth and Haijin Zhu",

note = "Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

year = "2017",

month = aug,

day = "3",

doi = "10.1021/acs.jpclett.7b01557",

language = "英语",

volume = "8",

pages = "3624--3629",

journal = "Journal of Physical Chemistry Letters",

issn = "1948-7185",

publisher = "American Chemical Society",

number = "15",

}

TY - JOUR

T1 - Proton Transport in Hierarchical-Structured Nafion Membranes

T2 - A NMR Study

AU - Yang, Hengrui

AU - Zhang, Jin

AU - Li, Jingliang

AU - Jiang, San Ping

AU - Forsyth, Maria

AU - Zhu, Haijin

PY - 2017/8/3

Y1 - 2017/8/3

N2 - It is known that hierarchical structure plays a key role in many unique material properties such as self-cleaning effect of lotus leaves and the antifogging property of the compound eyes of mosquitoes. This study reports a series of highly ordered mesoporous Nafion membranes with unique hierarchical structural features at the nanometer scale. Using NMR, we show for the first time that, at low RH conditions, the proton in the ionic domains migrates via a surface diffusion mechanism and exhibits approximately 2 orders of magnitude faster transport than that in the nanopores, whereas the nanopores play a role of reservoir and maintain water and thereby conductivity at higher temperature and lower humidities. Thereby creating hierarchical nanoscale structures is a feasible and promising strategy to develop PEMs that would enable efficient electrochemical performance in devices such as fuel cells, even in the absence of high humidity and at elevated temperatures.

AB - It is known that hierarchical structure plays a key role in many unique material properties such as self-cleaning effect of lotus leaves and the antifogging property of the compound eyes of mosquitoes. This study reports a series of highly ordered mesoporous Nafion membranes with unique hierarchical structural features at the nanometer scale. Using NMR, we show for the first time that, at low RH conditions, the proton in the ionic domains migrates via a surface diffusion mechanism and exhibits approximately 2 orders of magnitude faster transport than that in the nanopores, whereas the nanopores play a role of reservoir and maintain water and thereby conductivity at higher temperature and lower humidities. Thereby creating hierarchical nanoscale structures is a feasible and promising strategy to develop PEMs that would enable efficient electrochemical performance in devices such as fuel cells, even in the absence of high humidity and at elevated temperatures.

UR - http://www.scopus.com/inward/record.url?scp=85026826770&partnerID=8YFLogxK

U2 - 10.1021/acs.jpclett.7b01557

DO - 10.1021/acs.jpclett.7b01557

M3 - 文章

C2 - 28731348

AN - SCOPUS:85026826770

SN - 1948-7185

VL - 8

SP - 3624

EP - 3629

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 15

ER -

Proton Transport in Hierarchical-Structured Nafion Membranes: A NMR Study

Abstract

Access to Document

Other files and links

Fingerprint

Cite this