Effect of substrate temperature on structural properties and corrosion resistance of carbon thin films used as bipolar plates in polymer electrolyte membrane fuel cells

Afshar, Abdollah; Yari, Mohammad; Larijani, M. M.; Eshghabadi, M.

doi:10.1016/j.jallcom.2010.04.194

Cited by 31 publications

(7 citation statements)

References 29 publications

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“…This indicates that a structural change, from (nanocrystalline) graphitic to amorphous carbon, occurs depending on the bias voltage. In detail, the decrease in the D peak height can be attributed to a decrease in 6-fold carbon rings, hence more long-range ordering and less fine structures. , …”

Section: Resultsmentioning

confidence: 99%

Bias Voltage Dependency of Structural and Bipolar Plate-Related Properties of Cathodic Arc-Deposited Carbon-Based Coatings

Steinhorst,

Giorgio,

Roch

et al. 2023

ACS Appl. Mater. Interfaces

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Carbon-based coatings composed of a chromium interlayer and a carbon top layer were deposited on stainless steel substrates via cathodic arc evaporation. During the carbon deposition, the bias voltage was varied between 900 and 1 V to investigate the influence on the structural, electrical, and electrochemical properties. Raman spectroscopy indicated a dependency of the intensity ratio and G peak position on the bias voltage, which can be attributed to an alteration of the structure. Transmission electron microscopy (TEM) cross-section investigations revealed a graphite-like structure for most carbon top layers but with an increasing amount of disordered fractions, eventually resulting in an amorphous structure at 1 V. To further examine the structure, electron energy loss spectroscopy (EELS) was used. In the high-loss region, distinct π* and σ* peaks could be observed, which agree well with the TEM results. Additionally, analysis of the low-loss region showed that the 1 V carbon top layer exhibits a shifted σ plasmon peak at 20 eV corresponding to an amorphous structure. The carbon-based coatings are highly conductive with low interfacial contact resistance values between 4 and 1.5 mΩ cm 2 at 150 N cm −2 . From a bias voltage of 200 V, the resistance increases. To evaluate the corrosion resistance, we conducted potentiodynamic polarization tests. At first, with decreasing bias voltage, the corrosion resistance increases and then decreases for both the 100 and 1 V samples. Considering the low thickness, the coating with a carbon top layer deposited at 600 V had the best corrosion resistance. In combination with the excellent contact resistance, the 600 V sample is a highly suitable coating for metallic bipolar plates.

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Section: Resultsmentioning

confidence: 99%

Bias Voltage Dependency of Structural and Bipolar Plate-Related Properties of Cathodic Arc-Deposited Carbon-Based Coatings

Steinhorst,

Giorgio,

Roch

et al. 2023

ACS Appl. Mater. Interfaces

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“…The combination of Cr and CrN is of great potential to exhibit the synergistic functions. It was found in many reports [11,22,23,[26][27][28] that the ICR decreases with increase in the compaction force. Choi et al pointed out that this influence of the compaction force is due to an enlargement of the actual contact area under an increasing compaction force [11], and Lee et al [29] also stated that an increase in the contact areas acts as electrical junctions, leading to an decline of ICR.…”

Section: Design Of Materials and Coating Structurementioning

confidence: 97%

Arc ion plated Cr/CrN/Cr multilayers on 316L stainless steel as bipolar plates for polymer electrolyte membrane fuel cells

Zhang

Lin

et al. 2011

Journal of Power Sources

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“…The corrosion behaviors of the materials in the corrosive solution (0.1 M H 2 SO 4 + 2 ppm HF, 70 °C) were evaluated using open circuit potential (Eocp), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) tests. The interfacial contact resistance (ICR) values were measured to explore their conductivities according to the reference method [ 8 ].…”

Section: Experimental Sectionsmentioning

confidence: 99%

“…A great deal of research work has been performed on the surface modification coating technology of metal bipolar plates of fuel cells at home and abroad. Commonly used preparation methods of modified coatings include chemical vapor deposition [ 7 ], physical vapor deposition [ 8 ], closed field unbalanced magnetron sputter ion plating [ 9 ] and high-energy micro-arc alloying [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

New Strategy for the Design of Anti-Corrosion Coatings in Bipolar Plates Based on Hybrid Organic–Inorganic Layers

Sun

Zheng

et al. 2023

Molecules

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As a star material in conducting polymers, a polypyrrole coating was assembled onto the surface of 316 stainless steel by an electrochemical method. In the next step, the composite layer consisting of carbon nitride nanosheets (CNNS) and polymethyl methacrylate (PMMA) was sprayed. The corrosion manner of composite coatings in a simulated proton-exchange membrane fuel cell (PEMFC) environment was evaluated. The results show that the final coating generated at a voltage of 1.0 has demonstrated the optimized corrosion resistance. The polypyrrole layer improves the corrosion resistance of the stainless steel substrate, and the CNNS/PMMA coating further strengthens the physical barrier effect of the coating in corrosive solutions.

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Effect of substrate temperature on structural properties and corrosion resistance of carbon thin films used as bipolar plates in polymer electrolyte membrane fuel cells

Cited by 31 publications

References 29 publications

Bias Voltage Dependency of Structural and Bipolar Plate-Related Properties of Cathodic Arc-Deposited Carbon-Based Coatings

Bias Voltage Dependency of Structural and Bipolar Plate-Related Properties of Cathodic Arc-Deposited Carbon-Based Coatings

Arc ion plated Cr/CrN/Cr multilayers on 316L stainless steel as bipolar plates for polymer electrolyte membrane fuel cells

New Strategy for the Design of Anti-Corrosion Coatings in Bipolar Plates Based on Hybrid Organic–Inorganic Layers

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