Combined plasma surface modification of austenitic stainless steel for bipolar plates

Ніколов, K.; Bunk, K.; Jung, A.; Gerlach, Jürgen W.; Kaestner, Peter; Klages, C.‐P.

doi:10.1016/j.surfcoat.2017.08.047

Cited by 18 publications

(5 citation statements)

References 33 publications

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“…Among stainless steels, austenitic stainless steel possesses the best corrosion resistance and workability. Hence, a significant amount of researchers’ efforts has been put into developing metal bipolar plates using austenitic stainless steel [ 8 , 9 , 10 , 11 ]. However, during long-term operation, the highly corrosive environment of PEMFC stacks leads to the dissolution of metal ions (e.g., Cr 2+ and Ni 2+ ) at the metal surface, which can be contaminated by electrolytes and catalysts.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Niobium-Coated 316L Stainless Steels as Metal Bipolar Plates for Polymer Electrolyte Membrane Fuel Cells

et al. 2021

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Niobium was coated on 316L stainless steel by pulsed direct-current (DC) magnetron sputtering to improve corrosion behavior. The applied bias voltage highly affected the microstructure and crystallographic features, which lead to improved corrosion behavior. Due to the increased bias voltage, the microstructure of the niobium coating layer presented a smaller crystallite size and a densified structure, which obviously reduced the number of pinholes in the coated layer. Additionally, an increase in the degree of orientation toward the (110) plane, the most densely packed plane, lead to reduced dissolution of metal ions. Therefore, a pure niobium coating layer effectively protected the metal bipolar plate from a highly corrosive environment of polymer electrolyte membrane fuel cell (PEMFC) stacks. In particular, higher bias voltages of 600 and 800 V induced improved corrosion resistance, which satisfied the demand for the bipolar plate.

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Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Niobium-Coated 316L Stainless Steels as Metal Bipolar Plates for Polymer Electrolyte Membrane Fuel Cells

et al. 2021

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“…The typical potential of a bipolar plate in contact with the electrode is 0.1 V vs. SHE on the anode side and 0.8 V vs. SHE on the cathode side [ 10 , 24 ]. At these potentials, the measured current density should be as low as possible [ 35 , 40 , 41 ]. The DOE recommends a current density of <1 μA cm −2 without an anodic peak during passivation [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…The Ti coatings remained largely intact due to the higher breakdown potential, even after the polarization measurements; thus, no discoloration of the electrolyte could be observed. This corrosion behavior is more suitable in the initial phase of the PEMFC, when cathodic potentials of up to 1.4 V can occur [ 40 ]. In the case of the Ti coatings, this value is close to the breakdown potential.…”

Section: Resultsmentioning

confidence: 99%

Comparison of Magnetron-Sputtered and Cathodic Arc-Deposited Ti and Cr Thin Films on Stainless Steel for Bipolar Plates

Fredebeul-Beverungen,

Steinhorst,

Roch

2024

Materials

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In this work, the potential of magnetron sputtering, as well as cathodic arc evaporation, is investigated with regard to its suitability as a bipolar plate coating of a PEM fuel cell. For this purpose, Cr and Ti thin films were deposited onto a 0.1 mm SS316L by varying the power and bias voltage. The surface structure and thickness of the coatings are examined via SEM and tactile profilometry. Moreover, the coating variants are compared with each other based on the electrical and electrochemical properties relevant to bipolar plates. The sputtered Cr thin films achieve the lowest contact resistance values and exhibit a columnar structure with a smooth surface. Regarding the electrochemical properties, titanium deposited via cathodic arc evaporation has a low current density in the passive region and high breakthrough potential. All in all, both deposition techniques have their individual advantages for the preparation of bipolar plates’ coatings. However, Ti thin films prepared via cathodic arc seem to be the most suitable option due to the combination of a high deposition rate, a low cost and good coating properties.

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“…Bipolar plate (BP) is an important multifunctional component in polymer electrolyte membrane fuel cells (PEMFCs) system (14,15) which should possess some specifications such as superior electrical and thermal conductivity, high corrosion resistance, good mechanical performance, and low cost (16). Also, the BP can fasten the component of PEMFC stack, supply fuel and air, provide water and heat flow, collect current, electricity and prevent leakage of electrolyte (17)(18)(19)(20).…”

Section: Introductionmentioning

confidence: 99%

(Digital Presentation) Corrosion Behavior of Aluminum-Carbon Composite Bipolar Plates in Polymer Electrolyte Membrane Fuel Cells

Jahan¹,

Alam²,

Yonezawa³

et al. 2022

ECS Trans.

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Bipolar plate, aluminum is one of the most promising alternatives that can capable of uniform distribution of reactive gases over active areas and removal of the heat and exhaust water from the PEMFC. In this work, PEM fuel cell was operated using the bipolar plate constructed of two materials: a channel former made of glassy carbon and a gas isolation plate made of aluminum. Aluminum gas isolation plate at cathode side remained glossy after even1000 h cell operation. In contrast, an oxide layer with a thickness of about 1 μm was formed on the gas isolation plate at anode side. In the simulated corrosion test, a thick oxide layer was formed when aluminum was immersed in water while only a thin oxide layer was formed in the saturated water vapor. The microscopic images, scanning electron microscopy (SEM) images, energy dispersive X-ray (EDX) spectra and transmission electron microscopy (TEM) images were taken to evaluate the surface morphology, elemental composition and other analyses.

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Combined plasma surface modification of austenitic stainless steel for bipolar plates

Cited by 18 publications

References 33 publications

Corrosion Behavior of Niobium-Coated 316L Stainless Steels as Metal Bipolar Plates for Polymer Electrolyte Membrane Fuel Cells

Corrosion Behavior of Niobium-Coated 316L Stainless Steels as Metal Bipolar Plates for Polymer Electrolyte Membrane Fuel Cells

Comparison of Magnetron-Sputtered and Cathodic Arc-Deposited Ti and Cr Thin Films on Stainless Steel for Bipolar Plates

(Digital Presentation) Corrosion Behavior of Aluminum-Carbon Composite Bipolar Plates in Polymer Electrolyte Membrane Fuel Cells

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