Development of cost innovative BPs for a PEMFC stack for a 1kW-class residential power generator (RPG) system

Lee, Gil-yong; Jung, Min-kyung; Ryoo, Sung-nam; Park, Myung-seok; Ha, Samchul; Kim, Sunhoe

doi:10.1016/j.ijhydene.2010.04.081

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…In general cases, a thin carbon coating can be deposited on the MBP (stainless steel) surface by physical vapor deposition or thermal spraying etc. (Lee et al 2003(Lee et al , 2010Sun et al 2013). The stainless steel bipolar plates with carbon coatings are proposed to achieve a desired balance between good impact resistance and anticorrosion ability.…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Significant enhancement of corrosion resistance of stainless steel with nanostructured carbon coatings by substrate-catalytic CVD

et al. 2020

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The bipolar plate is the major component of proton-exchange membrane fuel cells and also a critical contributor to the fuel cell performance. Metallic bipolar plate (MBP) has high impact resistance but its poor chemical stability limits the service lifetime and stack stability. One of the feasible methods to enhance the corrosion resistance of MBPs is the formation of conductive protective coatings on the MBP surface. In this work, nanostructured carbon coatings were deposited on stainless steel by chemical vapor deposition using the substrate itself as catalysts. Under the optimized conditions, the corrosion potential of carbon coatings with dense spherical structure on stainless steel (2.1 V RHE ) is much higher than that of uncoated one (1.2 V RHE ), and even greater than that of commercial graphite bipolar plates (1.7 V RHE ), showing 75% and 23.5% improvement in corrosion resistance, respectively. Moreover, the corrosion current density of stainless steel with dense sphere-assembled coatings decreases to 0.2 mA/cm 2 , which is two orders of magnitude lower than that of graphite bipolar plates (27.4 mA/ cm 2 ) at the same applied potential (2.2 V RHE ). The coated stainless steel with excellent anticorrosion properties has potential applications for MBPs in proton-exchange membrane fuel cells, electrochemical treatment of waste water, and current collectors in lithium-ion batteries.

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Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Significant enhancement of corrosion resistance of stainless steel with nanostructured carbon coatings by substrate-catalytic CVD

et al. 2020

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“…However, the corrosion issue of metal in acidic medium makes the importance of studying the durability of metal bipolar plate stack . Lee developed a stack of 64 cells with metal bipolar plates and achieved a stack volume reduction of 20% compared with a stack of the same specifications consisting of graphite bipolar plates. The stack was operated for more than 500 hours of daily start‐up and shut‐down under a constant output power of 1.2 kW.…”

Section: Introductionmentioning

confidence: 99%

The durability investigation of a 10‐cell metal bipolar plate proton exchange membrane fuel cell stack

Tian

Chen

et al. 2018

Int J Energy Res

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Summary The metal bipolar plates (BPs) have replaced the graphite BPs in vehicle‐used proton exchange membrane fuel cell (PEMFC) stack because of their high volume power density. To investigate the durability of metal BP stack, this paper performed a durability test of 2000 hours on a 10‐cell metal BP fuel cell stack. The degradations of the average voltage and individual cell voltage in fuel cell stack were analyzed. To investigate the degradation mechanism, the stack was disassembled and the morphologies and compositions of no. 1, no. 5, and no. 10 cells after 2000 hours were characterized by SEM, TEM, and ASS. The results indicated that at 800 mA/cm2, the voltage decay rate is 42.303 μV/hour and the voltage decay percentage of the stack is 14.34% after 2000 hours according to the linearly fitting result. According to the US Department of Energy (DOE) definition of fuel cell stack life, only the voltage decay rate of OCV and the tenth cell is lower than the maximum voltage degradation rates of 10 000 hours. The decreases of homogeneity of stack were the main reason for its performance degradation. Especially for the tenth cell, its performance has almost no drop. The main failure reason of this metal BP stack is structural design rather than metal corrosion. The losses of Pt catalyst and C supporting are the main reason of performance degradation.

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“…It is well known that proton exchange membrane fuel cells have received broad attentions due to their low operation temperature, low emission and quick startup [1], [2]. This type of fuel cells is an electrochemical cell that is fed hydrogen, which is oxidized at the anode, and oxygen that is reduced at the cathode.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Annealing on Mechanical Properties of the Stainless Steel with TiCxNy Composites

Allabergenov¹,

Tursunkulov²,

Abidov³

et al. 2013

IJMMM

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Abstract-In this work we fabricated STS430L-TiC x N y composites by spark plasma sintering. As sintered STS:TiC x N y samples were annealed at 800 ~ 1100 °C and their morphological and mechanical properties were analyzed. All properties before and after annealing were compared in order to study the thermal annealing effect on mechanical properties. The annealing process at high temperature led to the crystallization of the STS:TiC x N y and increased the grain size, which was confirmed by FE-SEM analysis. Micro-hardness value was 750 MHV at 800 °C and reached its maximum value of 918 MHV at 1000 °C , respectively. A heights corrosion resistance property was observed for the samples annealed at 1100 °C. Overall, composites with micro TiC x N y after high temperature annealing show improved properties compared to as sintered composites, making it possible to be utilizes in fuel cell.

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Development of cost innovative BPs for a PEMFC stack for a 1kW-class residential power generator (RPG) system

Cited by 13 publications

References 18 publications

Significant enhancement of corrosion resistance of stainless steel with nanostructured carbon coatings by substrate-catalytic CVD

Significant enhancement of corrosion resistance of stainless steel with nanostructured carbon coatings by substrate-catalytic CVD

The durability investigation of a 10‐cell metal bipolar plate proton exchange membrane fuel cell stack

Effect of Thermal Annealing on Mechanical Properties of the Stainless Steel with TiCxNy Composites

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