NDLI: Measurement of Water Distribution in Anode of Polymer Electrolyte Fuel Cell Under Low Humidity Conditions

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Nishida, Kosuke Yokoi, Yohma Tsushima, Shohji Hirai, Shuichiro
Copyright Year	2009
Abstract	During low humidity operation of polymer electrolyte fuel cells (PEFCs), water management in anode electrode is essential for achieving sufficient membrane hydration and high proton conductivity. In this study, the water vapor condensation in an operating PEFC under low humidity conditions was experimentally visualized by using water sensitive paper (WSP), and the water distribution on the anode side was investigated. WSP is a test paper for detecting water droplets, fog and high humidity, which is coated with a yellow surface. This test paper was inserted between the anode electrode and separator in the transparent fuel cell. Furthermore, the dew-point temperature at the anode outlet was simultaneously measured using a hygro-thermometer, and the effects of operating conditions and flow configuration on the water transports between the anode and cathode electrodes were discussed. It was found that the water vapor concentration on the anode side increases considerably after the startup because of the back diffusion of the product water, and the water condensation occurs from the downstream section of the anode channel in the co-flow arrangement. However, at high current densities, the amount of water in the anode decreases due to the water flux driven by electro-osmotic drag. The difference of the water vapor concentrations between the anode and cathode electrodes arises significantly with cell temperature, and the back diffusion flux of water toward the anode increases. The counter-flow pattern of anode and cathode gases is effective in achieving uniform water distribution in the anode flow field. The dry H2 at the anode inlet is humidified by the water diffused through the membrane from the cathode outlet, and thus sufficient water can be supplied all over the anode flow field.
Sponsorship	Advanced Energy Systems Division
Starting Page	121
Ending Page	127
Page Count	7
File Format	PDF
ISBN	9780791848814
DOI	10.1115/FuelCell2009-85128
e-ISBN	9780791838471
Conference Proceedings	ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology
Language	English
Publisher Date	2009-06-08
Publisher Place	Newport Beach, California, USA
Access Restriction	Subscribed
Subject Keyword	Water Membranes Temperature Transparency Water resource management Water distribution Drag (fluid dynamics) Water vapor Flow (dynamics) Condensation Diffusion (physics) Electrodes Gases Thermometers Fuel cells Drops Proton conductivity Electrolytes Polymers Anodes
Content Type	Text
Resource Type	Article

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