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Visualization of Liquid Water Distribution in Fuel Cell by Using Neutron Radiography

Article of Honda R&D Technical Review Vol.23 No.1

Summary

The accumulation of liquid water in the cell is given as a major factor affecting the electric generation performance of fuel cells, and the visualization and quantification of this liquid water is a key technology for fuel cell water management.
This study used neutron radiography to visualize the liquid water distribution inside a fuel cell during electric generation, and quantified the liquid water.
The results showed that resistance overpotential, which is one factor that reduces electric generation performance, tends to drop as the quantity of liquid water in the CCM increases. However, the resistance overpotential becomes constant at a certain quantity of liquid water or more. In addition, it was also shown that the amount of voltage drop during constant-load electric generation is strongly correlated with the quantity of liquid water in the GDL, and that the amount of voltage drop increases as the quantity of liquid water in the GDL increases.

Reference

(1) http://rrsys.tokai-sc.jaea.go.jp/rrsys/html/riyou_bunya/pdf/0607.pdf, 2010/10/29
(2) Boillat, P., Frei, G., Lehmann, E. H., Scherer, G. G., Wokaun, A.: Neutron Imaging Resolution Improvements Optimized for Fuel Cell Applications, Electrochem. Solid-State Lett. 13, B25 (2010)
(3) Boillat, P., Scherer, G. G.: Chapter 12 of Neutron Radiography, edited by Wang, H., Yuan, X., Li, H.: Handbook of PEM fuel cell durability, Volume 2, PEM fuel cell diagnostics tools, Taylor & Francis Group, LLC, CRC, In Press (2011)

Author (organization or company)

Shintaro TANAKA(Automobile R&D Center)、Yukihito TANAKA(Automobile R&D Center)

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