Measurement of time-dependent changes and spatial distributions of current density in PEFC and water-content of PEM using a planer-surface coil as an NMR signal detector (effect of relative humidity and ratio of utilization of fuel gas on water content in PEM)

Yasuo Yokouchi, Kuniyasu Ogawa, Tomoyuki Haishi, Kohei Ito

研究成果: Article

抄録

To increase the electric power density of a polymer electrolyte fuel cell (PEFC), it is necessary to increase current density flowing through the membrane electrode assembly (MEA) in the whole PEFC. And this is controlled by the conditions of the fuel gas such as flow rate and humidity. We measured the spatial distribution and time dependence of changes in water content in the polymer electrolyte membrane (PEM) using Nuclear-Magnetic-Resonance (NMR) sensors in order to determine the influence of humidity and the utilization ratio of fuel gas on water content in PEM. Our experimental results showed that the water content at the outlet of the fuel gas increased with time when the flow rate was low, and this increase was induced by the water produced at the PEM. On the other hand, the water content in the PEM decreased with time when the flow rate was high and the humidity of the fuel gas was 70 %RH. When the humidity of the fuel gas was 85 %RH, we observed that water condensed at the outlet of the fuel gas. And a map illustrating the behavior of water content in PEM was made from the results.

元の言語English
ページ(範囲)917-927
ページ数11
ジャーナルNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
78
発行部数788
DOI
出版物ステータスPublished - 2012
外部発表Yes

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signal detectors
Gas fuels
Water content
Spatial distribution
moisture content
fuel cells
humidity
Fuel cells
Atmospheric humidity
spatial distribution
Current density
coils
Electrolytes
Nuclear magnetic resonance
electrolytes
current density
membranes
Detectors
Membranes
nuclear magnetic resonance

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

これを引用

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abstract = "To increase the electric power density of a polymer electrolyte fuel cell (PEFC), it is necessary to increase current density flowing through the membrane electrode assembly (MEA) in the whole PEFC. And this is controlled by the conditions of the fuel gas such as flow rate and humidity. We measured the spatial distribution and time dependence of changes in water content in the polymer electrolyte membrane (PEM) using Nuclear-Magnetic-Resonance (NMR) sensors in order to determine the influence of humidity and the utilization ratio of fuel gas on water content in PEM. Our experimental results showed that the water content at the outlet of the fuel gas increased with time when the flow rate was low, and this increase was induced by the water produced at the PEM. On the other hand, the water content in the PEM decreased with time when the flow rate was high and the humidity of the fuel gas was 70 {\%}RH. When the humidity of the fuel gas was 85 {\%}RH, we observed that water condensed at the outlet of the fuel gas. And a map illustrating the behavior of water content in PEM was made from the results.",
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T1 - Measurement of time-dependent changes and spatial distributions of current density in PEFC and water-content of PEM using a planer-surface coil as an NMR signal detector (effect of relative humidity and ratio of utilization of fuel gas on water content in PEM)

AU - Yokouchi, Yasuo

AU - Ogawa, Kuniyasu

AU - Haishi, Tomoyuki

AU - Ito, Kohei

PY - 2012

Y1 - 2012

N2 - To increase the electric power density of a polymer electrolyte fuel cell (PEFC), it is necessary to increase current density flowing through the membrane electrode assembly (MEA) in the whole PEFC. And this is controlled by the conditions of the fuel gas such as flow rate and humidity. We measured the spatial distribution and time dependence of changes in water content in the polymer electrolyte membrane (PEM) using Nuclear-Magnetic-Resonance (NMR) sensors in order to determine the influence of humidity and the utilization ratio of fuel gas on water content in PEM. Our experimental results showed that the water content at the outlet of the fuel gas increased with time when the flow rate was low, and this increase was induced by the water produced at the PEM. On the other hand, the water content in the PEM decreased with time when the flow rate was high and the humidity of the fuel gas was 70 %RH. When the humidity of the fuel gas was 85 %RH, we observed that water condensed at the outlet of the fuel gas. And a map illustrating the behavior of water content in PEM was made from the results.

AB - To increase the electric power density of a polymer electrolyte fuel cell (PEFC), it is necessary to increase current density flowing through the membrane electrode assembly (MEA) in the whole PEFC. And this is controlled by the conditions of the fuel gas such as flow rate and humidity. We measured the spatial distribution and time dependence of changes in water content in the polymer electrolyte membrane (PEM) using Nuclear-Magnetic-Resonance (NMR) sensors in order to determine the influence of humidity and the utilization ratio of fuel gas on water content in PEM. Our experimental results showed that the water content at the outlet of the fuel gas increased with time when the flow rate was low, and this increase was induced by the water produced at the PEM. On the other hand, the water content in the PEM decreased with time when the flow rate was high and the humidity of the fuel gas was 70 %RH. When the humidity of the fuel gas was 85 %RH, we observed that water condensed at the outlet of the fuel gas. And a map illustrating the behavior of water content in PEM was made from the results.

KW - Current distribution

KW - Nuclear magnetic resonance

KW - Polymer electrolyte fuel cell

KW - Water content

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