Fabrication of stainless steel bipolar plates for fuel cells using dynamic loads for the stamping process and performance evaluation of a single cell

In this study, a dynamic load (square wave) is applied to bipolar plates in order to reduce forming defects from the stamping process. Four round (R) sizes of die (R 0.05, 0.1, 0.2, 0.3 mm) are applied to edges that ran from the channel to the rib of the stamping die. Fuel cell performance tests are...

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Bibliographic Details
Published inInternational journal of hydrogen energy Vol. 39; no. 36; pp. 21461 - 21469
Main Authors Jin, Chul Kyu, Koo, Ja Yoon, Kang, Chung Gil
Format Conference Proceeding Journal Article
LanguageEnglish
Published Kidlington Elsevier 12.12.2014
Subjects
Alternative fuels. Production and utilization
Applied sciences
Channels
Current density
Dynamic loads
Energy
Exact sciences and technology
Fuel cells
Fuels
Hydrogen
Hydrogen-based energy
Performance evaluation
Plates
Stamping
Evaluation
Stamping
Hydrogen
Bipolar plates
Stainless steel
Manufacturing
Performance
Fuel cell
Dynamic load
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Summary:In this study, a dynamic load (square wave) is applied to bipolar plates in order to reduce forming defects from the stamping process. Four round (R) sizes of die (R 0.05, 0.1, 0.2, 0.3 mm) are applied to edges that ran from the channel to the rib of the stamping die. Fuel cell performance tests are carried out to analyse the depth and shape of bipolar plate channels formed according to the load conditions, and the effect of the die size on the fuel cell performance is evaluated. The depth of the bipolar plate channel increase with the round size of die regardless of the load type. The shape of the channel formed with a die of R 0.05 mm is trapezoidal, while that formed with a die of R 0.3 mm is triangular. Triangular channels have a higher current density than trapezoidal channels. A higher current density can be obtained with a square load than with a conventional straight load because the former produces a deeper and more uniform bipolar plate channel. The current density of a bipolar plate with a triangular channel formed by a square load with a die of R 0.3 mm is 531 mA cm super(-2). After TiN coating, the current density is 784 mA cm super(-2), which is about 58% of that of a graphite bipolar plate.
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ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.04.103