Acta Metallurgica Sinica (English Letters) ›› 2021, Vol. 34 ›› Issue (1): 77-84.DOI: 10.1007/s40195-020-01133-w

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Performance of Nb0.8Zr0.2 Layer-Modified AISI430 Stainless Steel as Bipolar Plates for Direct Formic Acid Fuel Cells

Yuanyuan Liu1,2, Zhongmin Lang1(), Jinlong Cui1(), Shengli An2()   

  1. 1. Inner Mongolia Key Laboratory of Coal Chemical Engineering and Comprehensive Utilization, School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China
    2. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, 014010, China
  • Received:2020-05-27 Revised:2020-07-17 Accepted:2020-07-28 Online:2021-01-10 Published:2021-01-28
  • Contact: Zhongmin Lang,Jinlong Cui,Shengli An

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 cm 2) is much smaller than that of bare 430SS (151.3 mΩ cm 2) 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.

Key words: Corrosion resistance, Nb0.8zr0.2 layer, Direct formic acid fuel cell, Interfacial contact resistance, Bipolar plates