Method to analyze the spatial current distribution in an operating PEFC based on NMR mesurement using small planer surface coils

Kuniyasu Ogawa, Yasuo Yokouchi, Tomoyuki Haishi, Kohei Ito

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In order to measure the local current density generated in a polymer electrolyte fuel cell (PEFC), nuclear magnetic resonance (NMR) signals were acquired by a coil inserted in a PEFC with a power generation area of 50 mm × 50 mm. Eight small planar surface coils with inner diameters of 0.6 mm were inserted between the gas diffusion layer and the membrane electrode assembly of the fuel cell. Changes in the frequency of the NMR signals due to local currents generated in the PEFC were recorded and analysed. To compute the spatial distribution of these local currents from the measured frequency shifts, it is necessary to use an inversion analysis based on the Biot-Savart law, which connects current and magnetic field strength. An algorithm developed in this study was used to quickly minimize the difference between the frequency shift calculated from an assumed current distribution and that measured experimentally. The algorithm uses the dependence of frequency shift on local current based on the equations of electricity and magnetism. In this paper we describe the derivation of the proportionality relation and the inversion algorithm. The computation time required for the inversion using the developed algorithm was a few tens of seconds. Using the developed algorithm, the spatial distribution of local current density generated in the PEFC was analysed.

Original languageEnglish
Title of host publicationProceedings of the 15th International Heat Transfer Conference, IHTC 2014
PublisherBegell House Inc.
Publication statusPublished - 2014
Event15th International Heat Transfer Conference, IHTC 2014 - Kyoto, Japan
Duration: 2014 Aug 102014 Aug 15

Other

Other15th International Heat Transfer Conference, IHTC 2014
CountryJapan
CityKyoto
Period14/8/1014/8/15

Fingerprint

current distribution
fuel cells
Fuel cells
coils
Electrolytes
Nuclear magnetic resonance
electrolytes
nuclear magnetic resonance
frequency shift
polymers
Polymers
inversions
Spatial distribution
spatial distribution
Current density
Biot-Savart law
current density
gaseous diffusion
Diffusion in gases
Magnetism

Keywords

  • Current monitoring
  • Fuel cell
  • Inversion analysis method
  • Nuclear magnetic resonance

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

Ogawa, K., Yokouchi, Y., Haishi, T., & Ito, K. (2014). Method to analyze the spatial current distribution in an operating PEFC based on NMR mesurement using small planer surface coils. In Proceedings of the 15th International Heat Transfer Conference, IHTC 2014 Begell House Inc..

Method to analyze the spatial current distribution in an operating PEFC based on NMR mesurement using small planer surface coils. / Ogawa, Kuniyasu; Yokouchi, Yasuo; Haishi, Tomoyuki; Ito, Kohei.

Proceedings of the 15th International Heat Transfer Conference, IHTC 2014. Begell House Inc., 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ogawa, K, Yokouchi, Y, Haishi, T & Ito, K 2014, Method to analyze the spatial current distribution in an operating PEFC based on NMR mesurement using small planer surface coils. in Proceedings of the 15th International Heat Transfer Conference, IHTC 2014. Begell House Inc., 15th International Heat Transfer Conference, IHTC 2014, Kyoto, Japan, 14/8/10.
Ogawa K, Yokouchi Y, Haishi T, Ito K. Method to analyze the spatial current distribution in an operating PEFC based on NMR mesurement using small planer surface coils. In Proceedings of the 15th International Heat Transfer Conference, IHTC 2014. Begell House Inc. 2014
Ogawa, Kuniyasu ; Yokouchi, Yasuo ; Haishi, Tomoyuki ; Ito, Kohei. / Method to analyze the spatial current distribution in an operating PEFC based on NMR mesurement using small planer surface coils. Proceedings of the 15th International Heat Transfer Conference, IHTC 2014. Begell House Inc., 2014.
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