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ASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011 | 2011

Measurement of current-density in PEFC with NMR sensors

Kuniyasu Ogawa; Yasuo Yokouchi; Tomoyuki Haishi; Kohei Ito

In order to improve the power generation performance of polymer electrolyte fuel cells (PEFC), it is necessary to maintain high current density over the whole area of the membrane electrode assembly (MEA) that includes the additional Pt-carbon particles loaded on the Polymer Electrolyte Membrane (PEM) as an electrocatalyst layer. However, the current density generated at the MEA is distributed unevenly due to a lack of hydrogen, flooding, and so on. Therefore, achieving a higher current density in a PEFC requires monitoring the local current density. The local current density in a PEFC can be measured by the frequency shift of the NMR signal received from planar surface coils inserted into the PEFC as sensors. This method is based on the relationship that the spatial gradient of the frequency shifts in NMR signals along the MEA is proportional to the magnetic field strength induced by local current density. In this study, two kinds of MEA were used. One MEA was with the platinum catalyst applied to an area of 50 mm * 50 mm. The other MEA was with platinum catalyst over half this area. The distributions of the frequency shift of NMR signals in PEFCs using these two MEAs were measured. These measured distributions of the spatial gradients were in agreement with those obtained by the theoretical-analysis of magnetic fields in PEFC. The spatial distributions of current density generated in PEFCs were obtained from the spatial gradients and theoretical result.© 2011 ASME


Archive | 2006

METHOD OF LOCALLY MEASURING MOBILITY OF PROTIC SOLVENT IN SAMPLE, INSTRUMENT OF LOCALLY MEASURING MOBILITY OF PROTIC SOLVENT IN SAMPLE, MEASURING INSTRUMENT LOCALLY MEASURING BEHAVIOR OF PROTIC SOLVENT IN SAMPLE BASED ON MAGNETIC

Kuniyasu Ogawa; Tomoyuki Haishi; Kohei Ito


Archive | 2006

Measuring instrument, fuel cell equipped therewith , and measuring method

Tomoyuki Haishi; Hidehira Ito; Kuniyasu Ogawa; 衡平 伊藤; 邦康 小川; 智之 拝師


Archive | 2005

Measuring device and measuring method for measuring permeation characteristic of membrane by using nuclear magnetic resonance method

Tomoyuki Haishi; Hidehira Ito; Kuniyasu Ogawa; 衡平 伊藤; 邦康 小川; 智之 拝師


Archive | 2006

Method for locally measuring mobility of protic solvent in sample, device for locally measuring mobility of protic solvent in sample, measuring device for locally measuring behavior of protic solvent in sample by using magnetic resonance method, measuring method, and program

Kuniyasu Ogawa; Tomoyuki Haishi; Kohei Ito


Archive | 2005

Method and instrument of locally measuring protic solvent content in samples

Kuniyasu Ogawa; Tomoyuki Haishi; Kohei Ito


Journal of Thermal Science and Technology | 2009

Current-Distribution Measurement in Polymer Electrolyte Water Electrolysis Equipment and Polymer Electrolyte Fuel Cell Using NMR Sensor

Yasuo Yokouchi; Kuniyasu Ogawa; Tomoyuki Haishi; Kohei Ito


Archive | 2010

Temperature control method and unit

Tomoyuki Haishi; 智之 拝師


Transactions of the Japan Society of Mechanical Engineers. B | 2006

Local water-content measurement of polymer electrolyte membrane for fuel cell applications using: Planar surface coil as a NMR signal detector

Kuniyasu Ogawa; Kohei Ito; Tomoyuki Haishi; Koichi Hishida


The Proceedings of the Thermal Engineering Conference | 2005

F141 Local self-diffusion measurement of water molecular in polymer electrolyte membrane using a planar surface coil

Kuniyasu Ogawa; Koshiro Sakakibara; Kohei Ito; Koichi Hishida; Tomoyuki Haishi; Shin Utsuzawa

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