TY - JOUR
T1 - Two dimensional distribution measurement of electric current generated in a polymer electrolyte fuel cell using 49 NMR surface coils
AU - Ogawa, Kuniyasu
AU - Sasaki, Tatsuyoshi
AU - Yoneda, Shigeki
AU - Tsujinaka, Kumiko
AU - Asai, Ritsuko
N1 - Funding Information:
This research was conducted as seed research from KRI, Inc. (2013–2016). The development of the NMR measurement system with 128 rf coils was supported by SENTAN, Japan Science and Technology Agency (JST).
Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/9
Y1 - 2018/9
N2 - In order to increase the current density generated in a PEFC (polymer electrolyte fuel cell), a method for measuring the spatial distribution of both the current and the water content of the MEA (membrane electrode assembly) is necessary. Based on the frequency shifts of NMR (nuclear magnetic resonance) signals acquired from the water contained in the MEA using 49 NMR coils in a 7 × 7 arrangement inserted in the PEFC, a method for measuring the two-dimensional spatial distribution of electric current generated in a unit cell with a power generation area of 140 mm × 160 mm was devised. We also developed an inverse analysis method to determine the two-dimensional electric current distribution that can be applied to actual PEFC connections. Two analytical techniques, namely coarse graining of segments and stepwise search, were used to shorten the calculation time required for inverse analysis of the electric current map. Using this method and techniques, spatial distributions of electric current and water content in the MEA were obtained when the PEFC generated electric power at 100 A.
AB - In order to increase the current density generated in a PEFC (polymer electrolyte fuel cell), a method for measuring the spatial distribution of both the current and the water content of the MEA (membrane electrode assembly) is necessary. Based on the frequency shifts of NMR (nuclear magnetic resonance) signals acquired from the water contained in the MEA using 49 NMR coils in a 7 × 7 arrangement inserted in the PEFC, a method for measuring the two-dimensional spatial distribution of electric current generated in a unit cell with a power generation area of 140 mm × 160 mm was devised. We also developed an inverse analysis method to determine the two-dimensional electric current distribution that can be applied to actual PEFC connections. Two analytical techniques, namely coarse graining of segments and stepwise search, were used to shorten the calculation time required for inverse analysis of the electric current map. Using this method and techniques, spatial distributions of electric current and water content in the MEA were obtained when the PEFC generated electric power at 100 A.
KW - Current measurement
KW - Frequency shift
KW - Polymer electrolyte fuel cell
KW - Surface coil
KW - Two dimensional distribution
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U2 - 10.1016/j.mri.2018.05.003
DO - 10.1016/j.mri.2018.05.003
M3 - Article
C2 - 29778692
AN - SCOPUS:85047265523
SN - 0730-725X
VL - 51
SP - 163
EP - 172
JO - Magnetic Resonance Imaging
JF - Magnetic Resonance Imaging
ER -