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Research Papers

Surface Treated SS304 Stainless Steel Bipolar Plates: Its Properties and Single Cell Performance

[+] Author and Article Information
Yu-Ming Lee, Chih-Yuan Lee, Ping-Hung Lai

Department of Mechanical Engineering, Yuan Ze Fuel Cell Center, Yuan Ze University, Taoyuan, Taiwan, R.O.C.

Shuo-Jen Lee

Department of Mechanical Engineering, Yuan Ze Fuel Cell Center, Yuan Ze University, Taoyuan, Taiwan, R.O.C.mesjl@saturn.yzu.edu.tw

J. Fuel Cell Sci. Technol 7(3), 031016 (Mar 16, 2010) (6 pages) doi:10.1115/1.3179758 History: Received May 02, 2008; Revised November 15, 2008; Published March 16, 2010; Online March 16, 2010

In this paper, a thin SS304 stainless steel is chosen as metallic bipolar plate. In order to improve the surface qualities, such as anticorrosion capability, surface roughness, and clearness, the surface of bipolar plate is treated by an electropolishing technology. From the results of corrosion and potentionstatic tests, the corrosion rate and corrosion current of treated plate are much improved. The corrosion rate and corrosion current are reduced to 0.037 mmPY and 3.56μAcm2. The cell performance tests show the peak power of treated cell is lower than original cell. However, for the long term tests, the cell with treated plate has a more stable power output. The results show that the treated plate has a good potential for using in the fuel cell.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental procedures

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Figure 2

Mechanism of the EP process (8)

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Figure 3

(a) Original specimen (×50). (b) Dull surface reflection.

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Figure 4

(a) Treated specimen (×50). (b) Dull surface reflection.

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Figure 5

Results of AES depth profile analyses

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Figure 6

Linear polarization tests of the SS304 bipolar plates

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Figure 7

Potentiostatic tests of SS304 bipolar plates at 0.6V versus SCE

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Figure 8

The general equivalent circuit of the passive film of stainless steels

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Figure 9

Electrochemical impedance of bipolar plates

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Figure 10

Cell performance tests (a) IV curves and (b) IP curves

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Figure 11

0.4 V constant voltage tests

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