Fabrication of Fuel Cells with High Power Density Using Micro Electrical Discharge Machining Milling

Dyi Huey Chang; Jung Chung Hung

doi:10.4028/www.scientific.net/AMR.335-336.1237

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 335-336Fabrication of Fuel Cells with High Power Density...

Fabrication of Fuel Cells with High Power Density Using Micro Electrical Discharge Machining Milling

Abstract:

Light and thin bipolar plates are essential in increasing the power density of a fuel cell. To construct high-aspect-ratio micro flow channels in such plates is, however, a big challenge. This study reports on machining micro flow channels in metallic bipolar plates using micro electrical discharge machining milling (micro EDMM) with a tungsten carbide electrode. We successfully machined metallic bipolar plates with 500μm channel and rib widths, height of 600μm in a reaction area of 20mm × 20mm, on 1mm thick of SUS316L stainless steel. The optimal operating parameters were explored and discussed. The performance of resulting fuel cell (Metallic-FC) was compared with a commercial available fuel cell composed of graphite bipolar plates (Graphite-FC). The high temperature of Metallic-FC increases its electrochemical reaction rate and consequently yields higher power density (723 mWcm^-2) then that of Graphite-FC (687.3 mWcm^-2)

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Periodical:

Advanced Materials Research (Volumes 335-336)

Pages:

1237-1241

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.335-336.1237

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Online since:

September 2011

Authors:

Dyi Huey Chang, Jung Chung Hung

Keywords:

Fuel Cell (FC), Metallic Bipolar Plate, Micro Electrical Discharge Milling, Micro Flow Channel

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