SnO2:F Coated Duplex Stainless Steel for PEM Fuel Cell Bipolar Plates

Journal Article · Tue Jan 01 04:00:00 EST 2008 · ECS Transactions

DOI:https://doi.org/10.1149/1.2982028· OSTI ID:958234

Wang, H; Turner, J A

Duplex 2205 stainless steel was deposited with 0.6 {micro}m thick SnO2:F coating; coated steel was characterized for PEMFC bipolar plate application. Compared with bare alloy, interfacial contact resistance (ICR) values of the coated 2205 steel are higher. SnO2:F coating adds its own resistance to the air-formed film on the steel. In a PEMFC anode environment, a current peak of ca. 25 {micro}A/cm2 registered at ca. 30 min for coated 2205 steel. It stabilized at ca. 2.0 {approx} -1.0 {micro}A/cm2. This peak is related to the complicated process of coating dissolution and oxide-layer formation. Anodic-cathodic current transfer occurred at ca. 200 min polarization. In a PEMFC cathode environment, current was stable immediately after polarization. The stable current was ca. 0.5 {approx} 2.0 {micro}A/cm2 during the entire polarization period. AES depth profiles with tested samples and ICP analysis with the tested solutions confirmed the excellent corrosion resistance of the SnO2:F coated 2205 alloy in simulated PEMFC environments.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO.
• Sponsoring Organization: USDOE
• DOE Contract Number: AC36-99GO10337
• OSTI ID: 958234
• Journal Information: ECS Transactions, Journal Name: ECS Transactions Journal Issue: 2, 2008 Vol. 16
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ANODES
CATHODES
COATINGS
CORROSION RESISTANCE
DISSOLUTION
FUEL CELLS
Hydrogen Technologies and Systems
PLATES
POLARIZATION
STAINLESS STEELS
STEELS