Investigation of water molecule concentration distribution and transport coefficient in solid polymer electrolyte membrane by magnetic resonance imaging

Kohei Ito, Kuniyasu Ogawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The performance of electrochemical cells, such as fuel cells, which use solid polymer membranes as electrolytes, is strongly dependent on the water molecule concentration in the membrane. Hence, it is important to understand the transport mechanism and concentration distribution of water molecules in the solid polymer electrolyte (SPE) membrane. In this study, the concentration distribution of water molecules and its time evolution in the SPE membrane were measured by magnetic resonance imaging with 100μm space and 15 s time resolutions. In the experiment in which the moistened membrane was taken to be the initial state, the diffusion coefficient of water molecules in the SPE membrane was estimated to be 0.8 × 10-10 m2/s. In the experiment in which the dried membrane was taken to be the initial state, the fast transport of water molecules, which seems to be caused by the advection effect, was observed, and its equivalent diffusion coefficient was estimated to be 5 × 10-10 m2/s.

Original languageEnglish
Pages (from-to)543-549
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume68
Issue number666
Publication statusPublished - 2002 Feb
Externally publishedYes

Fingerprint

Magnetic resonance
magnetic resonance
transport properties
Electrolytes
electrolytes
membranes
Membranes
Imaging techniques
Molecules
polymers
Polymers
coefficients
water
Water
molecules
diffusion coefficient
Electrochemical cells
electrochemical cells
Advection
advection

Keywords

  • Diffusion
  • Heavy water
  • Mass transfer
  • Nuclear magnetic resonance
  • Porous media
  • Solid polymer electrolyte membrane
  • Transport mechanics
  • Water molecule

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "The performance of electrochemical cells, such as fuel cells, which use solid polymer membranes as electrolytes, is strongly dependent on the water molecule concentration in the membrane. Hence, it is important to understand the transport mechanism and concentration distribution of water molecules in the solid polymer electrolyte (SPE) membrane. In this study, the concentration distribution of water molecules and its time evolution in the SPE membrane were measured by magnetic resonance imaging with 100μm space and 15 s time resolutions. In the experiment in which the moistened membrane was taken to be the initial state, the diffusion coefficient of water molecules in the SPE membrane was estimated to be 0.8 × 10-10 m2/s. In the experiment in which the dried membrane was taken to be the initial state, the fast transport of water molecules, which seems to be caused by the advection effect, was observed, and its equivalent diffusion coefficient was estimated to be 5 × 10-10 m2/s.",
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AU - Ogawa, Kuniyasu

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N2 - The performance of electrochemical cells, such as fuel cells, which use solid polymer membranes as electrolytes, is strongly dependent on the water molecule concentration in the membrane. Hence, it is important to understand the transport mechanism and concentration distribution of water molecules in the solid polymer electrolyte (SPE) membrane. In this study, the concentration distribution of water molecules and its time evolution in the SPE membrane were measured by magnetic resonance imaging with 100μm space and 15 s time resolutions. In the experiment in which the moistened membrane was taken to be the initial state, the diffusion coefficient of water molecules in the SPE membrane was estimated to be 0.8 × 10-10 m2/s. In the experiment in which the dried membrane was taken to be the initial state, the fast transport of water molecules, which seems to be caused by the advection effect, was observed, and its equivalent diffusion coefficient was estimated to be 5 × 10-10 m2/s.

AB - The performance of electrochemical cells, such as fuel cells, which use solid polymer membranes as electrolytes, is strongly dependent on the water molecule concentration in the membrane. Hence, it is important to understand the transport mechanism and concentration distribution of water molecules in the solid polymer electrolyte (SPE) membrane. In this study, the concentration distribution of water molecules and its time evolution in the SPE membrane were measured by magnetic resonance imaging with 100μm space and 15 s time resolutions. In the experiment in which the moistened membrane was taken to be the initial state, the diffusion coefficient of water molecules in the SPE membrane was estimated to be 0.8 × 10-10 m2/s. In the experiment in which the dried membrane was taken to be the initial state, the fast transport of water molecules, which seems to be caused by the advection effect, was observed, and its equivalent diffusion coefficient was estimated to be 5 × 10-10 m2/s.

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