Analysis of Molten Carbonate Fuel Cell Performance Using a Three-Phase Homogeneous Model

“…All the three curves fall closely. The parameters used in the cathode were taken from the previous paper [64] where the cathode data was fitted to the experimental data. The anode data was fitted separately before attempting to fit the full cell data.…”

Section: Effect Of Parametersmentioning

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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“…LiCoO 2 Ϫ 0.53 mA/cm 2 13 Ϫ5 mA/cm 2 , 6 LiNiCoO 2 Ϫ 0.65 mA/cm 2 ; 6 and anode material: Ni 110 mA/cm 2 . Simulations were run for different exchange current densities of the cathode keeping all other parameters constant.…”

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confidence: 99%

“…For cathode conductivities greater than 1 S/cm, the decrease in cell potential was negligible. The stateof-the-art cathode materials have the following conductivities; NiO, 13S/cm; 6 LiCoO 2 , 1S/cm; 6 LiNiCoO 2 , 5S/cm; 6 and LiFeO 2 , 0.05 S/cm. 13 This suggests that LiFeO 2 will suffer from ohmic limitations.…”

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confidence: 99%

“…Thus, trying to increase the electrolyte conductivity to 0.2 S/cm for a given set of cathode and anode materials improved the performance of the full cell. Figure 13 shows the results of the model simulation along with the experimental data of Soler et al 14 The parameters used in the cathode were taken from the previous paper 6 where the cathode model was fitted to the experimental data. The anode data was fitted separately before attempting to fit the full cell data.…”

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confidence: 99%

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Full Cell Mathematical Model of a MCFC

Subramanian

Haran

White

et al. 2003

J. Electrochem. Soc.

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A theoretical model for the molten carbonate fuel cell was developed based on the three-phase homogeneous approach. Using this model, the contribution of different cell components to losses in cell performance has been studied. In general, at low current densities, the electrolyte matrix contributed to the major fraction of potential losses. Mass transfer effects became important at high current densities and were more prominent at the cathode. Electrolyte conductivity and cathode exchange current density seemed to play a limiting role in determining cell performance. Using the model, the maximum power density from a single cell for different cell thicknesses was determined.

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Analysis of Molten Carbonate Fuel Cell Performance Using a Three-Phase Homogeneous Model

Cited by 17 publications

References 17 publications

Analytical modeling of electrochemical mechanisms in CO2 and CO/CO2 producing Direct Carbon Fuel Cell

Analytical modeling of electrochemical mechanisms in CO2 and CO/CO2 producing Direct Carbon Fuel Cell

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

Full Cell Mathematical Model of a MCFC

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