Abstract
To improve the interfacial conductivity and corrosion resistance of AISI430 stainless steel (430SS) as bipolar plates for direct formic acid fuel cells (DFAFCs), a Nb0.8Zr0.2 layer has been successfully synthesized via the pulsed laser deposition (PLD) technique on the surface of 430SS. This Nb0.8Zr0.2 layer is smooth, uniform, and comparatively compact without any surface flaw and micropore. Investigation under the simulated anodic environment of DFAFCs (0.05 M H2SO4 + 2 ppm HF + 10 M HCOOH at 70 °C) shows that the corrosion resistance of 430SS is obviously ameliorated after the PLD modification. In addition, the interfacial contact resistance of Nb0.8Zr0.2-430SS (6.0 mΩ cm2) is much smaller than that of bare 430SS (151.3 mΩ cm2) at the clamping force of 140 N cm−2. Besides, different from the highly increased interfacial contact resistance of bare 430SS, the Nb0.8Zr0.2-430SS shows a minor increase resistance after potentiostatic tests in simulated anodic environment of DFAFCs.
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