Study on surface topography of 446M stainless steel as a bipolar plate on interfacial contact resistance of polymer electrolyte membrane fuel cell

Kim, Kwang Min; Kim, Seok Nyeon; Kim, Jong Hee; Lee, Yun Yong; Kim, Kyoo Young

doi:10.1016/j.jpowsour.2012.07.102

Cited by 11 publications

(3 citation statements)

References 15 publications

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“…ICR between GDL and bipolar plates is an extremely important parameter that affects fuel cell output power through ohmic polarization directly. Normally, ICR is determined by the electrical conductivity of the film and the real contact area between bipolar plates and GDL which is affected by the film's hardness and roughness [40, 41], so ICR is highly related to the electrical and physical properties of the film. The ICR results between NbC/а‐C:H coated titanium and GDL from 0.2 MPa to 2.0 MPa with an interval of 0.1 MPa are shown in Figure 9.…”

Section: Resultsmentioning

confidence: 99%

Properties of NbC/а‐C:H films on titanium bipolar plates for proton exchange membrane fuel cells

et al. 2022

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Surface modification of metallic bipolar plates is a crucial subject for the performance elevation of proton exchange membrane fuel cells (PEMFCs). In this work, a series of NbC/а‐C:H films with different Nb/C ratios are prepared by arc ion plating. Film microstructure, composition, mechanical properties, hydrophobility, interfacial contact resistance (ICR), and corrosion resistance in the simulated cathode environment of PEMFCs are systematically studied. The results show that within the experiment conditions, higher NbC content helps to promote the film hardness and adhesion strength as well as the interfacial conductivity. While higher а‐C:H content attributes to a more compact microstructure thus improving the anti‐corrosion performance. The best corrosion resistance and conductivity come with the lowest corrosion current density of 0.09 µA/cm2 and ICR of 0.77 mΩ cm2, respectively. Based on the result of this research, to further improve the comprehensive performance of NbC/а‐C:H film, strategies for increasing the metal carbide content and preventing surface metal oxidation while keeping a dense and fine microstructure need to be considered.

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Section: Resultsmentioning

confidence: 99%

Properties of NbC/а‐C:H films on titanium bipolar plates for proton exchange membrane fuel cells

et al. 2022

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“…ICR of metal/Toray contacts passes through minimum at some metal surface roughness, and the smoothest metal BP surface does not necessarily offer the lowest ICR [34]. There are many who report that ICR diminishes with decreasing surface roughness and then regains resistivity when the surface gets smoother [36][37][38][39].…”

Section: Samples Characterizationmentioning

confidence: 99%

“…AISI416's CTE (9.9 × 10 −6 /°C [32]) is close to TiN's CTE (9.4 × 10 −6 /°C [33]) thus thermal stresses of such coating are expected to be minimal, as well as related coating cracks. Besides, a due emphasis is given to the investigation of the BP surface roughness evolution in the course of BP corrosion; whereas roughness influence of contacting surfaces on ICR is well reported [34][35][36][37], up to now not much attention was paid to roughness evolution of BP surface under the influence of the corrosion process itself.…”

Section: Introductionmentioning

confidence: 99%

Proton exchange membrane (PEM) fuel cell bipolar plates prepared from a physical vapor deposition (PVD) titanium nitride (TiN) coated AISI416 stainless-steel

Stein

Ein‐Eli

2019

SN Appl. Sci.

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Metal nitrides (and particularly TiN) are among the most extensively investigated proton exchange membrane fuel cell bipolar plates (BP) coatings. The most employed methods of nitrides coating deposition are various modifications of physical vapor deposition (PVD), while different types of stainless steels are the most common BP materials coated with TiN PVD films. In the current work, we report on the integrity maintenance of TiN PVD coating of AISI416, considering this as a clue to the sustainability of such a film. The advantage of this combination lies in the fact that the coefficients of thermal expansion (CTE) of this alloy is close to the CTE of the TiN film. Thus, the thermal stresses of such coating are expected to be minimal, as well as related coating cracks. We conducted a thorough surface analysis of roughness evolution in the course of BP corrosion process, investigating different initial surface pretreatments. Finally, we found that fine mirror-like polished BP substrate prior to deposition is essential for TiN film's integrity during corrosion analysis time.

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Effect of surface roughness on contact resistance and electrochemical corrosion behavior of 446 stainless steel in simulated anode environments for proton exchange membrane fuel cell

Xu,

Jin,

et al. 2024

J Solid State Electrochem

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Study on surface topography of 446M stainless steel as a bipolar plate on interfacial contact resistance of polymer electrolyte membrane fuel cell

Cited by 11 publications

References 15 publications

Properties of NbC/а‐C:H films on titanium bipolar plates for proton exchange membrane fuel cells

Properties of NbC/а‐C:H films on titanium bipolar plates for proton exchange membrane fuel cells

Proton exchange membrane (PEM) fuel cell bipolar plates prepared from a physical vapor deposition (PVD) titanium nitride (TiN) coated AISI416 stainless-steel

Effect of surface roughness on contact resistance and electrochemical corrosion behavior of 446 stainless steel in simulated anode environments for proton exchange membrane fuel cell

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