Development of an eight-channel NMR system using RF detection coils for measuring spatial distributions of current density and water content in the PEM of a PEFC

Kuniyasu Ogawa, Yasuo Yokouchi, Tomoyuki Haishi, Kohei Ito

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The water generation and water transport occurring in a polymer electrolyte fuel cell (PEFC) can be estimated from the current density generated in the PEFC, and the water content in the polymer electrolyte membrane (PEM). In order to measure the spatial distributions and time-dependent changes of current density generated in a PEFC and the water content in a PEM, we have developed an eight-channel nuclear magnetic resonance (NMR) system. To detect a NMR signal from water in a PEM at eight positions, eight small planar RF detection coils of 0.6 mm inside diameter were inserted between the PEM and the gas diffusion layer (GDL) in a PEFC. The local current density generated at the position of the RF detection coil in a PEFC can be calculated from the frequency shift of the obtained NMR signal due to an additional magnetic field induced by the local current density. In addition, the water content in a PEM at the position of the RF detection coil can be calculated by the amplitude of the obtained NMR signal. The time-dependent changes in the spatial distributions were measured at 4 s intervals when the PEFC was operated with supply gas under conditions of fuel gas utilization of 0.67 and relative humidity of the fuel gas of 70%RH. The experimental result showed that the spatial distributions of the local current density and the water content in the PEM within the PEFC both fluctuated with time.

Original languageEnglish
Pages (from-to)147-153
Number of pages7
JournalJournal of Magnetic Resonance
Volume234
DOIs
Publication statusPublished - Jan 1 2013

Fingerprint

Water content
Spatial distribution
Electrolytes
moisture content
fuel cells
Fuel cells
Polymers
spatial distribution
Current density
Magnetic Resonance Spectroscopy
coils
Nuclear magnetic resonance
electrolytes
current density
membranes
Membranes
nuclear magnetic resonance
Water
polymers
Gases

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Development of an eight-channel NMR system using RF detection coils for measuring spatial distributions of current density and water content in the PEM of a PEFC. / Ogawa, Kuniyasu; Yokouchi, Yasuo; Haishi, Tomoyuki; Ito, Kohei.

In: Journal of Magnetic Resonance, Vol. 234, 01.01.2013, p. 147-153.

Research output: Contribution to journalArticle

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