The Experts below are selected from a list of 7428 Experts worldwide ranked by ideXlab platform
Baolian Yi - One of the best experts on this subject based on the ideXlab platform.
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carbon based films coated 316l stainless steel as Bipolar Plate for proton exchange membrane fuel cells
International Journal of Hydrogen Energy, 2009Co-Authors: Zhigang Shao, Bo Wu, Yu Fu, Baolian YiAbstract:Abstract Carbon-based films on 316L stainless steel were prepared as Bipolar Plates for proton exchange membrane fuel cells (PEMFCs) by pulsed bias arc ion plating. Three kinds of films were formed including the pure C film, the C–Cr composite film and the C–Cr–N composite film. Interfacial conductivity of the Bipolar Plate with C–Cr film was the highest, which showed great potential of application. Corrosion tests in simulated PEMFC environments revealed that the C–Cr film coated sample always showed better anticorrosive performance than 316L stainless steel either in reducing or oxidizing environments. The C–Cr film coated Bipolar Plate sample also had high surface energy. The contact angle of the C–Cr film coated sample with water was 92°, which is beneficial for water management in a fuel cell.
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coated 316l stainless steel with crxn film as Bipolar Plate for pemfc prepared by pulsed bias arc ion plating
Journal of Power Sources, 2008Co-Authors: Yu Fu, Zhigang Shao, Baolian YiAbstract:Abstract Three different kinds of Cr x N films on 316L stainless steels were prepared by pulsed bias arc ion plating as Bipolar Plates for proton exchange membrane fuel cell (PEMFC). The interfacial contact resistance, corrosion resistance and surface energy of the Bipolar Plate samples were investigated. Among the three samples, the 316L stainless steel coated with Cr 0.49 N 0.51 → Cr 0.43 N 0.57 gradient film (sample 2) exhibited the best-integrated performance. The contact resistance between sample 2 and Toray carbon paper was 6.9–10.0 mΩ cm 2 under 0.8–1.2 MPa. The Bipolar Plate sample also showed improved corrosion resistance in simulated PEMFC environments. Either in the reduction environment or in the oxidation environment 25 °C and 70 °C, the corrosion current densities of sample 2 were about one to two orders of magnitude lower than those of the base metal. In addition, the open circuit corrosion potential of sample 2 was also the highest in 0.5 M H 2 SO 4 + 5 ppm F − solution at 25 °C. The treated Bipolar Plate had high surface energy; and the contact angle of sample 2 with water was about 90°, which is beneficial for water management in fuel cell.
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a novel electrode Bipolar Plate assembly for vanadium redox flow battery applications
Journal of Power Sources, 2008Co-Authors: Huamin Zhang, Peng Qian, Jian Chen, Baolian YiAbstract:Abstract A novel electrode-Bipolar Plate assembly has been developed and evaluated for application in the vanadium redox flow battery (VRB). It is composed of three parts: a graphite felt (electrode), an adhesive conducting layer (ACL) and a flexible graphite Plate (Bipolar Plate). The ACL connects the electrode with the Bipolar Plate to an assembly. By the evaluations of cost, resistivity, surface morphology, electrolyte permeation and single cell performance, this novel assembly demonstrates its applicability in VRB as evident in the following outcomes: (1) lowers the cost and area resistivity to about 10% and 40% of the conventional setups, respectively; (2) improves electrical conductivity to 4.97 mΩ cm as compared to over 100 mΩ cm of the carbon-plastic composite Bipolar Plate; (3) attains zero electrolyte permeation; and (4) achieves a higher energy efficiency of 81% at a charge/discharge current density of 40 mA cm−2 when employed in a VRB single cell, which is 73% for the conventional setup. All these indicate that the novel electrode-Bipolar Plate assembly is a promising candidate for VRB applications.
Shinichi Hirano - One of the best experts on this subject based on the ideXlab platform.
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ex situ evaluation of nanometer range gold coating on stainless steel substrate for automotive polymer electrolyte membrane fuel cell Bipolar Plate
Journal of Power Sources, 2010Co-Authors: A Kumar, Mark Stephen Ricketts, Shinichi HiranoAbstract:Abstract The Bipolar Plate in polymer electrolyte membrane (PEM) fuel cell helps to feed reactant gases to the membrane electrode assembly (MEA) and collect current from the MEA. To facilitate these functions, the Bipolar Plate material should exhibit excellent electrical conductivity and corrosion resistance under fuel cell operating conditions, and simultaneously be of low-cost to meet commercialization enabling targets for automotive fuel cells. In the present work, we focus on the benchmarking of 10 nm gold coated SS316L (a.k.a. Au Nanoclad ® ) Bipolar Plate material through ex situ tests, which is provided by Daido Steel (Japan). The use of nanometer range Au coatings help to retain the noble properties of gold while significantly reducing the cost of the Bipolar Plate. The area specific resistance of the flat sample is 0.9 mΩ cm 2 while that for the formed Bipolar Plate is 6.3 mΩ cm 2 at compaction force of 60 N cm −2 . The corrosion current density was less than 1 μA cm −2 at 0.8 V/NHE with air sparge simulating cathodic conditions. Additionally, gold coated SS316L showed anodic passivation of SS316L, thereby exhibiting robustness towards coating defects including surface scratches that may originate during the manufacturing of the Bipolar Plate. These series of ex situ tests indicate that 10 nm gold coated SS316L has good potential to be considered for commercial Bipolar Plates in automotive fuel cell stack.
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ex situ evaluation of nanometer range gold coating on stainless steel substrate for automotive polymer electrolyte membrane fuel cell Bipolar Plate
Journal of Power Sources, 2010Co-Authors: A Kumar, Mark Stephen Ricketts, Shinichi HiranoAbstract:Abstract The Bipolar Plate in polymer electrolyte membrane (PEM) fuel cell helps to feed reactant gases to the membrane electrode assembly (MEA) and collect current from the MEA. To facilitate these functions, the Bipolar Plate material should exhibit excellent electrical conductivity and corrosion resistance under fuel cell operating conditions, and simultaneously be of low-cost to meet commercialization enabling targets for automotive fuel cells. In the present work, we focus on the benchmarking of 10 nm gold coated SS316L (a.k.a. Au Nanoclad ® ) Bipolar Plate material through ex situ tests, which is provided by Daido Steel (Japan). The use of nanometer range Au coatings help to retain the noble properties of gold while significantly reducing the cost of the Bipolar Plate. The area specific resistance of the flat sample is 0.9 mΩ cm 2 while that for the formed Bipolar Plate is 6.3 mΩ cm 2 at compaction force of 60 N cm −2 . The corrosion current density was less than 1 μA cm −2 at 0.8 V/NHE with air sparge simulating cathodic conditions. Additionally, gold coated SS316L showed anodic passivation of SS316L, thereby exhibiting robustness towards coating defects including surface scratches that may originate during the manufacturing of the Bipolar Plate. These series of ex situ tests indicate that 10 nm gold coated SS316L has good potential to be considered for commercial Bipolar Plates in automotive fuel cell stack.
Stuart James Rowen - One of the best experts on this subject based on the ideXlab platform.
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stainless steel as a Bipolar Plate material for solid polymer fuel cells
Journal of Power Sources, 2000Co-Authors: D P Davies, Paul Leonard Adcock, Mark Christopher Turpin, Stuart James RowenAbstract:Stainless steel Bipolar Plates for the Solid Polymer Fuel Cell (SPFC) offer many advantages over conventional graphitic materials. These include relative low cost, high strength, ease of manufacture and as they can be shaped into thin sheets, significant improvement in the power/volume ratio. However, interfacial ohmic losses across the metallic Bipolar Plate and the Membrane Electrode Assembly (MEA), reduce the overall power output from a SPFC. Despite a large range of commercially available alloys, 316 stainless steel has traditionally been the alloy of choice for Bipolar Plates. A number of alternative grades of stainless steel have been evaluated in terms of the electrical resistance of their surface oxide film. This showed that ohmic losses exhibited in fuel cell performance varied depending on the elemental composition of the stainless steel alloy. Three stainless steel alloys, 310, 316 and 904L, were chosen as candidate Bipolar Plate materials. Increased polarisation was observed in the order 904L<310<316. This was maintained throughout an ongoing endurance test, where these cells have been run for over 3000 h without significant performance degradation. This difference in polarisation behaviour was attributed to variation in thickness of the oxide film. Analysis has shown no deleterious effect on the surface of the Bipolar Plate and no evidence of corrosion.
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Bipolar Plate materials for solid polymer fuel cells
Journal of Applied Electrochemistry, 2000Co-Authors: D P Davies, Paul Leonard Adcock, Mark Christopher Turpin, Stuart James RowenAbstract:The interfacial ohmic losses between the Bipolar Plate and the MEA can significantly reduce the overall power output from a SPFC. For graphitic Bipolar Plate materials, these losses are insignificant relative to stainless steel, where the existence of a passive film on the surface greatly reduces electrical conductivity. In this paper we have evaluated different Bipolar Plate materials, and present long-term fuel cell data for Poco® graphite, titanium, 316 and 310 stainless steel. The properties of the passive film on the surface of 316 and 310 stainless steel are markedly different. Although both were adequately corrosion resistant in a fuel cell environment, 310 tended to produce higher fuel cell performance and like 316, no degradation was observed after 1400 h testing. Analysis of the passive film indicated that this increased performance was related to the decreased thickness of the oxide film.
Ilbeom Choi - One of the best experts on this subject based on the ideXlab platform.
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gasket integrated carbon silicone elastomer composite Bipolar Plate for high temperature pemfc
Composite Structures, 2015Co-Authors: Ilbeom ChoiAbstract:Abstract The primary components of proton exchange membrane fuel cell (PEMFC) systems are Bipolar Plates, end Plates, membrane electrode assemblies (MEAs), gas diffusion layers (GDLs), and gaskets. The PEMFC composed of many components induces sealing problem of the stack, which affects the fuel efficiency, reliability, and maintenance costs of the system. Conventional PEMFCs are sealed with numerous elastomeric gaskets to seal the stack, which increases the manufacturing and assembly costs. To reduce the assembly time and to increase the sealing reliability without the use of gaskets, a gasket-integrated carbon/silicone elastomer composite Bipolar Plate is developed. Silicone elastomer is employed rather than conventional glassy thermoset or thermoplastic polymers for the matrix of the composite Bipolar Plate, where the silicone elastomer works as gaskets due to its resilience. The mechanical and electrical properties of the developed carbon/silicone elastomer composite are investigated at both room temperature and operating temperature of high-temperature PEMFCs (HT-PEMFCs). The sealability of the gasket integrated composite Bipolar Plate is tested.
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Gasket-integrated carbon/silicone elastomer composite Bipolar Plate for high-temperature PEMFC
Composite Structures, 2015Co-Authors: Ilbeom ChoiAbstract:Abstract The primary components of proton exchange membrane fuel cell (PEMFC) systems are Bipolar Plates, end Plates, membrane electrode assemblies (MEAs), gas diffusion layers (GDLs), and gaskets. The PEMFC composed of many components induces sealing problem of the stack, which affects the fuel efficiency, reliability, and maintenance costs of the system. Conventional PEMFCs are sealed with numerous elastomeric gaskets to seal the stack, which increases the manufacturing and assembly costs. To reduce the assembly time and to increase the sealing reliability without the use of gaskets, a gasket-integrated carbon/silicone elastomer composite Bipolar Plate is developed. Silicone elastomer is employed rather than conventional glassy thermoset or thermoplastic polymers for the matrix of the composite Bipolar Plate, where the silicone elastomer works as gaskets due to its resilience. The mechanical and electrical properties of the developed carbon/silicone elastomer composite are investigated at both room temperature and operating temperature of high-temperature PEMFCs (HT-PEMFCs). The sealability of the gasket integrated composite Bipolar Plate is tested.
Dong Ming Zhang - One of the best experts on this subject based on the ideXlab platform.
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Stacks with TiN/titanium as the Bipolar Plate for PEMFCs
Energy, 2012Co-Authors: Zhijun Ren, Dong Ming Zhang, Zai Yi WangAbstract:Proton exchange membrane fuel cell (PEMFC) is a potential alternative for the internal combustion engine. But many problems, such as metallic Bipolar Plate instead of graphite Bipolar Plate to decrease the cost, should be solved before its application. Based on the previous results that single cell with TiN/Ti as Bipolar Plates shows high performance and enough long-time durability, the progress on the stacks with TiN/Ti as Bipolar Plates is reported in this manuscript. Till now seldom report is focused on stacks because of the complicated processing technique, especially for that with TiN/Ti as Bipolar Plate. The flow field in the Plate is punched from titanium deformation, and two Plates are welded by laser welding to form one piece of Bipolar Plate. The adopted processing techniques for stacks with TiN/Ti as Bipolar Plate exhibit advantage and feasibility in industry. The power density by weight for the stack is as high as 1353 W kg−1, although it still has space to be improved. Next work should be focused on the design of flow channel parameters and flow field type based on plastic deformation of metal materials.
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tin coated titanium as the Bipolar Plate for pemfc by multi arc ion plating
International Journal of Hydrogen Energy, 2011Co-Authors: Dong Ming Zhang, Liang Tao Duan, Zai Yi Wang, Jun Zhao, Weihsing Tuan, Koichi NiiharaAbstract:In the present study, an economic feasible coating technique, multi-arc ion plating (MIP) technique, is adopted to prepare a titanium nitride (TiN) coating onto titanium (Ti) substrate. The use of the TiN-coated Ti as the Bipolar Plate for proton exchange membrane fuel cell (PEMFC) is then evaluated. Contrast to Ti substrate, the corrosion resistance and interfacial contact resistance are improved after applying the TiN coating. The single fuel cell with Ti/TiN Bipolar Plate shows higher performance and has been operated for more than 1000 h without decrease in output.
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Preparation of Multi-Layer Film on Stainless Steel as Bipolar Plate for Polymer Electrolyte Membrane Fuel Cell
Advanced Materials Research, 2010Co-Authors: Dong Ming Zhang, Liang Tao Duan, Lu Guo, Zai Yi WangAbstract:In the present study, we try to prepare hydrophobic film coated on stainless steel as the Bipolar Plate for polymer electrolyte membrane fuel cell (PEMFC). Magnetron sputtering (MS) was adoped to prepare the Cr3Ni2/Cr2N multi-layer coated on stainless steel. The corrosion resistance and electrical conductance of the coated substrate were tested. The water contact angles were measured. The film exhibits improved corrosion resistance and electrical conductance. The corrosion current is 0.58µA.cm-2 and the contact resistance at 240N.cm-2 is 8.5mΩ.cm2. Meanwhile, it is a kind of hydrophobic film with water contact angle of 107o. The performance shows strong dependance on microstructural characteristics. The nano-protrudes on the SS304/Cr3Ni2/Cr2N surface result in the film with hydrophobic property, just like the effect of lotus surface.
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corrosion behavior of tin coated stainless steel as Bipolar Plate for proton exchange membrane fuel cell
International Journal of Hydrogen Energy, 2010Co-Authors: Dong Ming Zhang, Liang Tao Duan, Weihsing TuanAbstract:Abstract Stainless steel is a potential material to be used as the Bipolar Plate for proton exchange membrane fuel cell (PEFC) because of its suitable physical and mechanical properties. Several coating techniques have been applied to improve its corrosion resistance. But seldom study is focused on the microstructure evolution with corrosion. In the present study, the use of TiN-coated stainless steel as the Bipolar Plate is evaluated. Two surface coating techniques, pulsed bias arc ion plating (PBAIP) and magnetron sputtering (MS), are adoped to prepare the TiN-coated stainless steel. Their corrosion resistances and electrical conductivities of the coated substrates are evaluated. The performance shows strong dependance on microstructural characteristics. The corrosion of SS304/Ti2N/TiN prepared by MS mainly occurs on the grain boundary. The corrosion of SS304/TiN prepared by PBAIP mainly takes place from the large particles on the coating. The Ti2N/TiN multilayer coating provides superb corrosion protective layer for stainless steel. Both the TiN and Ti2N/TiN coatings provide low contact resistance.