Molybdenum carbide coated 316L stainless steel for bipolar plates of proton exchange membrane fuel cells

Wang, Lun; Tao, Youkun; Zhang, Zhen; Wang, Yajun; Feng, Qi; Wang, Haijiang; Li, Hui

doi:10.1016/j.ijhydene.2018.12.184

Cited by 70 publications

(15 citation statements)

References 44 publications

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“…Very low current densities were measured in 0.5 sulfuric acid with 2 ppm HF at 70 • C, 0.23 µA•cm −2 under anodic and 0.091 µA•cm −2 under cathodic conditions. Contact resistance also met the DOE limits after exposure tests (6.5 mΩcm 2 ) [110].…”

Section: Surface Treatment Based On Carbidesmentioning

confidence: 66%

Metallic Material Selection and Prospective Surface Treatments for Proton Exchange Membrane Fuel Cell Bipolar Plates—A Review

2021

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The aim of this review is to summarize the possibilities of replacing graphite bipolar plates in fuel-cells. The review is mostly focused on metallic bipolar plates, which benefit from many properties required for fuel cells, viz. good mechanical properties, thermal and electrical conductivity, availability, and others. The main disadvantage of metals is that their corrosion resistance in the fuel-cell environment originates from the formation of a passive layer, which significantly increases interfacial contact resistance. Suitable coating systems prepared by a proper deposition method are eventually able to compensate for this disadvantage and make the replacement of graphite bipolar plates possible. This review compares coatings, materials, and deposition methods based on electrochemical measurements and contact resistance properties with respect to achieving appropriate parameters established by the DOE as objectives for 2020. An extraordinary number of studies have been performed, but only a minority of them provided promising results. One of these is the nanocrystalline β-Nb2N coating on AISI 430, prepared by the disproportionation reaction of Nb(IV) in molten salt, which satisfied the DOE 2020 objectives in terms of corrosion resistance and interfacial contact resistance. From other studies, TiN, CrN, NbC, TiC, or amorphous carbon-based coatings seem to be promising. This paper is novel in extracting important aspects for future studies and methods for testing the properties of metallic materials and factors affecting monitoring characteristics and parameters.

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Section: Surface Treatment Based On Carbidesmentioning

confidence: 66%

Metallic Material Selection and Prospective Surface Treatments for Proton Exchange Membrane Fuel Cell Bipolar Plates—A Review

2021

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“…From the curves, corrosion potentials (φ corr ) are obtained. The φ corr is related to coating's thermodynamic stability, and the higher φ corr value normally means better corrosion resistance from the aspect of thermodynamics [3]. In the tests, the φ corr of 316L SS is −0.761 V vs MSE, whereas TiNbN/316L SS has a more positive value of −0.744 V. Compared with the substrate, the TiNb film increases the φ corr by 138 mV.…”

Section: Corrosion Behaviormentioning

confidence: 92%

“…Therefore, the corrosion resistance of the bipolar plates is one of the decisive factors influencing the lifetime of a PEMFC. The American Department of Energy (DOE) has established a series of required properties for bipolar plates and one crucial target is to improve corrosion resistance and conductivity [3,4]. Earlier studies concentrated on graphite materials and graphite-based composite bipolar plates [5][6][7], considering the high corrosion resistance of graphite.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior and Conductivity of TiNb and TiNbN Coated Steel for Metallic Bipolar Plates

et al. 2019

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To improve corrosion resistance and electronic conductivity of bipolar plates for proton exchange membrane fuel cell (PEMFC), coatings of TiNb and TiNbN on 316L stainless steel (SS) were prepared by magnetron sputtering. X-ray diffraction (XRD) measurements confirmed the existence of metallic nitrides in the TiNbN coating. Scanning electron microscope (SEM) tests showed that the deposited coatings provided smooth surfaces. Further electrochemical measurements indicated that the corrosion resistance of TiNb coating was significantly higher than that of substrate. At 0.19 V vs MSE, the long-term stabilized current density of TiNb/316L SS was lower than 1 μA·cm−2. The interfacial contact resistance (ICR) values between coating and carbon paper suggested that TiNb and TiNbN films had better contact conductivity than 316L SS substrate. In conclusion, TiNb coated 316L SS metallic bipolar plate material is a promising option for PEMFC.

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“…The thickness of graphite coating was about 2 µm and enough to provide corrosion resistance for a long time operation in PEMFCs. Interestingly, the low ICR value was observed to 900-3 h even if the thickness of the coating is large (larger than other modified metal coatings) [10,16].…”

Section: Open-circuit Potentialmentioning

confidence: 92%

“…Therefore, there is an urgent need to address the corrosion problems caused by the surface modification of the metal BPPs [6]. In recent years, many researchers have modified the surface of aluminum [7,8], stainless steel [9][10][11], titanium [12], and copper to improve corrosion resistance [13].…”

Section: Introductionmentioning

confidence: 99%

Low‐cost graphite coated copper as bipolar plates of proton exchange membrane fuel cells for corrosion protection

Yan

Zuo

et al. 2021

Fuel Cells

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The aim of this essay is to explore a new method to prepare a graphite coating on the surface of copper foil. In our study, we find that when the treated copper foil is buried in natural flake graphite powder and heated to 900 • C for 1 h, the surface of copper foil grows a graphite coating. The graphite coating on the surface of copper foil increases the corrosion resistance under the simulated proton exchange membrane fuel cell environment. At the same time, graphite coating also increases corrosion potential and is higher than the anode working potential. This keeps the anode in a cathodic protection state and avoids the generation of metal ions. Compared to the substrate, the coated potentiostatic polarization for 4 h shows that it is not only corrosion current density can get reduced by an order of magnitude but also can quickly reach a steady state. The value of the copper with graphite coating in interfacial contact resistance is ∼18.4 mΩ cm 2 under 1.4 MPa, which is also reaching the Department of Energy targets.

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Molybdenum carbide coated 316L stainless steel for bipolar plates of proton exchange membrane fuel cells

Cited by 70 publications

References 44 publications

Metallic Material Selection and Prospective Surface Treatments for Proton Exchange Membrane Fuel Cell Bipolar Plates—A Review

Metallic Material Selection and Prospective Surface Treatments for Proton Exchange Membrane Fuel Cell Bipolar Plates—A Review

Corrosion Behavior and Conductivity of TiNb and TiNbN Coated Steel for Metallic Bipolar Plates

Low‐cost graphite coated copper as bipolar plates of proton exchange membrane fuel cells for corrosion protection

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