TY - JOUR
T1 - Two-dimensional spatial distributions of the water content of the membrane electrode assembly and the electric current generated in a polymer electrolyte fuel cell measured by 49 nuclear magnetic resonance surface coils
T2 - Dependence on gas flow rate and relative humidity of supplied gases
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. (2013–2017). The development of the NMR measurement system with 128 rf coils was supported by SENTAN , Japan Science and Technology Agency (JST) .
Funding Information:
This research was conducted as seed research from KRI, Inc. (2013–2017). The development of the NMR measurement system with 128 rf coils was supported by SENTAN, Japan Science and Technology Agency (JST).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/12/31
Y1 - 2019/12/31
N2 - A PEFC (polymer electrolyte fuel cell) with a large power generation area of 140 mm × 160 mm has spatial distributions of the water content of the MEA (membrane electrode assembly) and the electric current produced that depend on the flow rate and relative humidity of the supplied gas. When 49 NMR (nuclear magnetic resonance) surface coils arranged in 7 rows × 7 columns were inserted into the PEFC, two-dimensional spatial distributions of the water content of the MEA and the electric current could be measured from the acquired NMR signals. The water content of the MEA was calculated from the intensity of the NMR signal, and the electric current distribution was determined by an inverse analysis that reproduces the spatial distribution of the resonance frequency of the NMR signals. The PEFC, which was supplied with hydrogen and oxygen at a high humidity of 80 %RH, generated electric power at 130 A over the whole area of the MEA. On the other hand, under a low humidity of 40 %RH and low flow rate conditions, the water content of the MEA became high in the midstream and downstream regions, and a high electric current was generated in these regions.
AB - A PEFC (polymer electrolyte fuel cell) with a large power generation area of 140 mm × 160 mm has spatial distributions of the water content of the MEA (membrane electrode assembly) and the electric current produced that depend on the flow rate and relative humidity of the supplied gas. When 49 NMR (nuclear magnetic resonance) surface coils arranged in 7 rows × 7 columns were inserted into the PEFC, two-dimensional spatial distributions of the water content of the MEA and the electric current could be measured from the acquired NMR signals. The water content of the MEA was calculated from the intensity of the NMR signal, and the electric current distribution was determined by an inverse analysis that reproduces the spatial distribution of the resonance frequency of the NMR signals. The PEFC, which was supplied with hydrogen and oxygen at a high humidity of 80 %RH, generated electric power at 130 A over the whole area of the MEA. On the other hand, under a low humidity of 40 %RH and low flow rate conditions, the water content of the MEA became high in the midstream and downstream regions, and a high electric current was generated in these regions.
KW - Electric current
KW - NMR measurement
KW - Polymer electrolyte fuel cell
KW - Surface coil
KW - Two-dimensional spatial distribution
KW - Water content
UR - http://www.scopus.com/inward/record.url?scp=85073371718&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073371718&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2019.227254
DO - 10.1016/j.jpowsour.2019.227254
M3 - Article
AN - SCOPUS:85073371718
VL - 444
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
M1 - 227254
ER -