Corrosion Protection of Molten Carbonate Fuel Cell Gas Seals

Swaroop, R.; Sim, J. W.; Kinoshita, K.

doi:10.1149/1.2131297

Cited by 26 publications

(12 citation statements)

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“…This was done to improve the wet seal of the cell by intimately binding the membrane structure to the MACOR housings with a layer of LiA10, formed in situ. During heatup to run temperature, the aluminum was converted to A1203 and then to LiA10, through a subsequent reaction with Li2C03 (Swaroop et al, 1978).…”

Section: Run C: Polishing Application With 100 Ppm H2s Natural Gasmentioning

confidence: 99%

Removal of hydrogen sulfide from natural gas through an electrochemical membrane separator

Alexander

Winnick

1994

AIChE Journal

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An advanced process is developed for the separation of H2S from natural gas through an electrochemical membrane. H2S is removed from naturalgas by reduction to the sulfide ion and H2 at the cathode. The sulfide ion migrates to the anode through a molten salt electrolyte suspended in an inert ceramic matrix. Once at the anode it is oxidized to elemental sulfur and swept away for condensation in an inert gas stream. The natural gas is enriched with H2. Order-of-magnitude reductions in H2S concentration have been repeatedly recorded on a single pass through the cell. This process allows removal o f H2S, whileproducing H2 and elementalsulfur directly. No absorbents are used, and there is no need for subsequent treatment of a concentrated H2S stream as with conventional gas sweetening technology. This makes the process economically attractive, since it is much less equipment-intensive than conventional technology.

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Section: Run C: Polishing Application With 100 Ppm H2s Natural Gasmentioning

confidence: 99%

Removal of hydrogen sulfide from natural gas through an electrochemical membrane separator

Alexander

Winnick

1994

AIChE Journal

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“…The corrosion resistance of stainless steels and nickel-base alloys in aqueous solutions can often be increased by addition of chromium or aluminum [22][23][24]. Chromium protects the base metal from corrosion by forming an oxide layer at the surface.…”

Section: Introductionmentioning

confidence: 99%

“…This corrosion process also results in increased ohmic loss due to formation of scales on the steel. Also, aluminum addition has a positive effect on corrosion resistance [23,24]. However, corrosion scales formed on aluminum containing alloys show low conductivity leading to a significant ohmic polarization loss.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Cathode Long-Term Stability in Molten Carbonate Fuel Cells: Experimental Study and Mathematical Modeling

Colonmer¹,

Ganesan²,

Subramanian³

et al. 2002

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This project focused on addressing the two main problems associated with state of art Molten Carbonate Fuel Cells, namely loss of cathode active material and stainless steel current collector deterioration due to corrosion. We followed a dua l approach where in the first case we developed novel materials to replace the cathode and current collector currently used in molten carbonate fuel cells. In the second case we improved the performance of conventional cathode and current collectors through surface modification. States of art NiO cathode in MCFC undergo dissolution in the cathode melt thereby limiting the lifetime of the cell. To prevent this we deposited cobalt using an electroless deposition process. We also coated perovskite The corrosion of the current collector in the cathode side was also studied. The corrosion characteristics of both SS304 and SS304 coated with Co-Ni alloy were studied. This study confirms that surface modification of SS304 leads to the formation of complex scales with better barrier properties and better electronic conductivity at 650 o C.A three phase homogeneous model was developed to simulate the performance of the molten carbonate fuel cell cathode and the complete fuel cell. The homogeneous model is based on volume averaging of different variables in the three phases over a small volume element. This approach can be used to model porous electrodes as it represents the real system much better than the conventional agglomerate model. Using the homogeneous model the polarization characteristics of the MCFC cathode and fuel cell were studied under different operating conditions. Both the cathode and the full cell model give good fits to the experimental data.

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“…The corrosion resistance of stainless steels and nickel-base alloys in aqueous solutions can often be increased by addition of chromium or aluminum [14][15][16]. Chromium protects the base metal from corrosion by forming an oxide layer at the surface.…”

Section: Introductionmentioning

confidence: 99%

“…This corrosion process also results in increased ohmic loss due to formation of scales on the steel. Similarly, aluminum additions have a positive effect on corrosion resistance [15,16]. However, corrosion scales formed in aluminum containing alloys show low conductivity leading to a significant ohmic polarization loss.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Cathode Long-Term Stability in Molten Carbonate Fuel Cells: Experimental Study and Mathematical Modeling

White¹

2001

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SS 304 was encapsulated with thin layers of Co-Ni by an electroless deposition process.The corrosion behavior of SS304 and Co-Ni-SS304 was investigated in molten carbonate under cathode gas atmosphere with electrochemical and surface characterization tools. Surface modification of SS304 reduced the dissolution of chromium and nickel into the molten carbonate melt. Composition of the corrosion scale formed in case of Co-Ni-SS304 is different from SS304 and shows the presence of Co and Ni oxides while the latter shows the presence of lithium ferrite. Polarization resistance for oxygen reduction reaction and conductivity of corrosion values for the corrosion scales were obtained using impedance analysis and current-potential plots. The results indicated lower polarization resistance for oxygen reduction reaction in the case of CoNi-SS304 when compared to SS304. Also, the conductivity of the corrosion scales was considerably higher in case of Co-Ni-SS304 than the SS304. This study shows that modifying the current collector surface with Co-Ni coatings leads to the formation of oxide scales with improved barrier properties and electronic conductivity.3

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Corrosion Protection of Molten Carbonate Fuel Cell Gas Seals

Cited by 26 publications

References 0 publications

Removal of hydrogen sulfide from natural gas through an electrochemical membrane separator

Removal of hydrogen sulfide from natural gas through an electrochemical membrane separator

Optimization of the Cathode Long-Term Stability in Molten Carbonate Fuel Cells: Experimental Study and Mathematical Modeling

Optimization of the Cathode Long-Term Stability in Molten Carbonate Fuel Cells: Experimental Study and Mathematical Modeling

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