Investigation of hydrophobic and anti-corrosive behavior of Cr-DLC film on stainless steel bipolar plate

Wang, Limin; Wu, Yanxia; Yu, Shengwang; Liu, Ying; Shi, Bang; Hu, Enli; Hei, Hongjun

doi:10.1016/j.diamond.2022.109352

Cited by 8 publications

(11 citation statements)

References 31 publications

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“…In the Cr 2p spectrum shown in Figure 2 b, two peaks corresponding to the Cr-C bond were identified, the peaks were observed at approximately ~574.1 eV and ~574.8 eV (according to the NIST database), whereas another corresponding to the Cr-O bond was observed at ~576.7 eV, which represents the Cr-O bond. The existence of the Cr-O peak indicates some chromium oxide (CrO) in the air environment [ 20 ]. Figure 2 c exhibits the Ti 2p curve, which deconvoluted two small peaks.…”

Section: Resultsmentioning

confidence: 99%

“…However, in PEMFC applications, amorphous carbon film-coated bipolar plates always become damaged during stack operation due to the unavoidable coating corrosion deterioration and increased ICR. Many researchers have tried to retard the film damage by doping elements into pure amorphous carbon films [ 20 , 21 , 22 , 23 ]. The multiple elements of the amorphous carbon films may have a severe impact on the performance of the sputtering coating.…”

Section: Introductionmentioning

confidence: 99%

“…The multiple elements of the amorphous carbon films may have a severe impact on the performance of the sputtering coating. For example, Wang et al [ 20 ] studied the corrosion behavior of 304 stainless steel bipolar plates protected with Cr-doped carbon coatings applied by magnetron sputtering, testing the films in the PEMFC environment. Chromium doping increased the sp 2 -hybridized carbon content, and the Cr doping also increased the density of the amorphous carbon.…”

Section: Introductionmentioning

confidence: 99%

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Improvement in Corrosion Resistance and Interfacial Contact Resistance Properties of 316L Stainless Steel by Coating with Cr, Ti Co-Doped Amorphous Carbon Films in the Environment of the PEMFCs

Wang

et al. 2023

Molecules

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In order to obtain films with high corrosion resistance and excellent interfacial contact resistance (ICR) on 316L stainless steel used for bipolar plates in proton-exchange membrane fuel cells (PEMFCs), Cr, Ti co-doped amorphous carbon films were prepared on 316L stainless steel. The preparation method for the coating was magnetron sputtering. The doping amount of the Ti element was controlled by a Cr target and a Ti target current. The change in the structure and properties of the coating after the change from Cr single-element doping to Cr and Ti co-doping was studied. The change rule of the structure and properties of the coating from Cr single-element doping to Cr and Ti co-doping was studied. An increase in the Ti content led to a decreased grain boundary, a flatter surface, and a higher sp2-hybridized carbon content. TiC and CrC nanocrystals were formed in the amorphous carbon structure together. The amorphous carbon films doped with Cr and Ti simultaneously achieved a low ICR and high corrosion resistance compared with single-Cr-doped amorphous carbon. The enhanced corrosion resistance was attributed to the decreasing grain boundary, the formation of the TiC crystal structure, and the smaller grain size. The best performance was obtained at a Ti target current of 2A. Compared with bare 316L stainless steel, the corrosion resistance of Cr, Ti co-doped amorphous carbon (Icorr = 5.7 × 10−8 A/cm2, Ti-2 sample) was greatly improved. Because Ti doping increased the content of sp2-hybridized carbon in the coating, the contact resistance of the coating decreased. Moreover, the interfacial contact resistance was 3.1 mΩ·cm2 in the Ti-2 sample, much lower than that of bare 316L stainless steel. After the potentiostatic polarization test, the coating still had excellent conductivity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement in Corrosion Resistance and Interfacial Contact Resistance Properties of 316L Stainless Steel by Coating with Cr, Ti Co-Doped Amorphous Carbon Films in the Environment of the PEMFCs

Wang

et al. 2023

Molecules

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“…Over the years, nonporous graphite plates and metal plates have been optimized as effective BPP materials meeting these specifications. Factors such as material selection, surface texture, coatings, and flow field designs impact the electronic conductivity of BPPs . However, striking a balance between plate thickness and durability is challenging.…”

Section: Bulk Electric Resistancementioning

confidence: 99%

“…Factors such as material selection, 43 surface texture, 28 coatings, 44 and flow field designs 45 impact the electronic conductivity of BPPs. 35 However, striking a balance between plate thickness and durability is challenging. While slimmer BPPs tend to offer reduced electronic resistance, they might be less resilient to operational pressures, raising concerns over their durability.…”

Section: Bulk Electric Resistancementioning

confidence: 99%

Review on Electric Resistance in Proton Exchange Membrane Fuel Cells: Advances and Outlook

Wang,

He,

et al. 2024

Energy Fuels

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Improving fuel efficiency and performance in proton exchange membrane fuel cells is closely linked to reducing electric resistance. This review discusses the vital role, behavior, and methods to reduce electric resistance in fuel cells. We particularly focus on how electric resistance affects cell polarization loss and overall performance. We summarize key parameters, prediction formulas, standard values, and testing methods for both bulk resistance and contact resistance. A significant part of the review looks at often-overlooked factors like flow field design, clamping pressure, surface properties, and substrate material. The unique "channel/rib" design on the bipolar plates surface has a major impact on electric resistance. Research shows a balance between rib/channel ratios, clamping pressure, and resistance values. While narrower ratios help reduce contact resistance, they can increase bulk resistance and overall cell resistance, affecting voltage outputs. There's an ideal clamping pressure that offers the best balance between resistance and performance. Further, this review underscores the significance of material selection, flow field design, clamping pressure, and surface treatments in resistance management. Designs like serpentine flow fields and materials such as carbon paper are noted for their lower resistance characteristics. Synthesizing these insights, we propose coherent strategies to enhance cell performance by reducing electric resistance through improved fuel cell design. Conclusively, we analyze the challenges and future perspectives in achieving minimal electric resistance and maximal cell performance. Potential avenues for future research are identified, with an emphasis on nanomaterials, advanced fabrication techniques, experimental methodologies, numerical modeling, flow field design, and operational optimization.

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Modified diamond-like carbon (Cr-DLC) coating applied by PACVD-CAPVD hybrid method: Characterization and evaluation of tribological and corrosion behavior

Khodayari

Elmkhah

Alizadeh

et al. 2023

Diamond and Related Materials

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Investigation of hydrophobic and anti-corrosive behavior of Cr-DLC film on stainless steel bipolar plate

Cited by 8 publications

References 31 publications

Improvement in Corrosion Resistance and Interfacial Contact Resistance Properties of 316L Stainless Steel by Coating with Cr, Ti Co-Doped Amorphous Carbon Films in the Environment of the PEMFCs

Improvement in Corrosion Resistance and Interfacial Contact Resistance Properties of 316L Stainless Steel by Coating with Cr, Ti Co-Doped Amorphous Carbon Films in the Environment of the PEMFCs

Review on Electric Resistance in Proton Exchange Membrane Fuel Cells: Advances and Outlook

Modified diamond-like carbon (Cr-DLC) coating applied by PACVD-CAPVD hybrid method: Characterization and evaluation of tribological and corrosion behavior

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