Investigations on novel low-cost graphite composite bipolar plates

Scholta, Joachim; Rohland, B.; Trapp, V.; Focken, U.

doi:10.1016/s0378-7753(99)00322-5

Cited by 124 publications

(41 citation statements)

References 1 publication

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“…Moreover, in strategic application of the fuel cell stack, the weight and volume requirements are more stringent along with the electrical conductivity and mechanical strength. Conventionally, graphite, metals, carbon/polymer composites, and carbon/carbon composites are used for the fabrication of bipolar plates [12][13][14][15]. However, low mechanical strength of graphite, costly and time consuming fabrication of carbon/carbon composite, high density and corrosive nature of metals, are the major issues, which limit their application as bipolar plate material especially in strategic application [16].…”

Section: Introductionmentioning

confidence: 99%

Ultra‐thin carbon/silicon carbide composite bipolar plate for advanced fuel cells

Raunija

Gautam

Verma

2018

Materialwissenschaft Werkst

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The first cut results on the development of ultra-thin, low gas permeable, easily machineable, high electrical conductivity and high mechanical strength bipolar plate made up of carbon reinforced ceramic matrix are reported for the strategic application. Short carbon fiber reinforced silicon carbide matrix composite is fabricated by chopping continuous carbon fibers into discrete length, exfoliating and dispersing the exfoliated carbon fibers in silicon carbide powder and finally hot-pressing to make the composite. Three compacts containing exfoliated carbon fiber contents of 20, 30, 50 vol. % in silicon carbide matrix are prepared and characterized for electrical, thermal, gas permeability, density, and mechanical properties. The composite plates with exfoliated carbon fiber vol. % of 50, offer excellent electrical conductivity, flexural and compressive strengths and gas permeability of 2.2 3 10 -7 cm -3 cm -2 s -1. Carbon/silicon carbide plate shows 37.5 % and 4.7 % lower volume and weight, respectively on comparing with the best reported data of carbon/polymer composite plate. Competency of the material for bipolar plate fabrication is tested and found that the ceramic carbon composite may open up the new horizon for the fabrication of ultra-thin bipolar plates for strategic applications.

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Section: Introductionmentioning

confidence: 99%

Ultra‐thin carbon/silicon carbide composite bipolar plate for advanced fuel cells

Raunija

Gautam

Verma

2018

Materialwissenschaft Werkst

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“…Efforts with composite materials have been carried out in many groups, including the research organisations and industry worldwide [15][16][17][18][19][20][21][22][23]. Wilson and co-workers [15][16][17] developed a composite bipolar plate with vinyl ester and graphite powder a decade ago.…”

Section: Introductionmentioning

confidence: 99%

Reviewing Metallic PEMFC Bipolar Plates

2010

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A bipolar plate is one of the most important components in a polymer exchange membrane fuel cell (PEMFC) stack and has multiple functions. Metallic bipolar plate candidates have advantages over composite rivals in excellent electrical and thermal conductivity, good mechanical strength, high chemical stability, very wide alloy choices, low cost and, most importantly, existing pathways for high‐volume, high‐speed mass production. The challenges with metallic bipolar plates are the higher contact resistance and possible corrosion products, which may contaminate the membrane electrode assembly. This review evaluates the candidate metallic and coating materials for bipolar plates and gives the perspective of the research trends.

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“…PEMFC is an electrochemical device that converts directly and effectively the chemical energy stored in fuels into electrical energy and is commercially used as a viable power source for portable, stationary and transportation applications [1][2][3]. In general, single fuel cell unit can provide only very small power output with about 0.5-0.7 V. In order to increase output power, individual fuel cell must be connected into stacks by bipolar plates.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH value on corrosion resistance and surface conductivity of plasma-nitrided 304L bipolar plate for PEMFC

Tian

Sun

2010

Int. J. Energy Res.

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SUMMARYLow temperature plasma nitriding is developed to meet the requirements for corrosion resistance and interfacial contact resistance (ICR) of stainless steel 304L as the bipolar plate for PEMFC. A dense and supersaturatednitrogen nitrided layer has formed on the surface of the stainless steel 304L. Electrochemical behavior for the untreated and plasma-nitrided 304L was measured in H 2 SO 4 (pH 5 1-5)12 ppm F À simulating PEMFC environment, and the ICR was evaluated before and after corrosion tests. The experimental results have shown that the ICR for the plasma nitrided 304L is lower than the requirement of U.S. DOE (o10 mO cm 2 to 2010). Corrosion resistance and the ICR at the compaction force of 150-200 N cm À2 increase with increasing pH value for the untreated and plasma-nitrided 304L. The passive current densities for the untreated and plasma-nitrided 304L are all lower than 16 mA cm À2. The ICR between passive film and carbon paper are increased markedly because of passive film formed on the surface of both studied 304L. However, the passive current density and the ICR are lower for the plasma nitrided 304L than those for the untreated one at the given pH value, which results from the different composition of the stable passive film formed on the surface. The low temperature plasma nitriding provides a promising method for 304L using as bipolar plate for PEMFC. Further research is needed to evaluate the long-term stability of passive film and the performance of single fuel cell.

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Investigations on novel low-cost graphite composite bipolar plates

Cited by 124 publications

References 1 publication

Ultra‐thin carbon/silicon carbide composite bipolar plate for advanced fuel cells

Ultra‐thin carbon/silicon carbide composite bipolar plate for advanced fuel cells

Reviewing Metallic PEMFC Bipolar Plates

Effect of pH value on corrosion resistance and surface conductivity of plasma-nitrided 304L bipolar plate for PEMFC

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