Modeling CO2 electrolysis in solid oxide electrolysis cell

Narasimhaiah, Geetha; Janardhanan, Vinod M.

doi:10.1007/s10008-013-2081-8

Cited by 32 publications

(14 citation statements)

References 21 publications

(39 reference statements)

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“…The formulas and values for these parameters along with its derivation can be found in Refs. [15,32]. An Arrhenius expression is used to describe the temperature dependence of exchange current density in the form of i * i , which is given by…”

Section: Electrochemistrymentioning

confidence: 99%

“…A one-dimensional electrochemical model and a twodimensional CFD model was developed and validated with the above experiment, though an analytical expression was used to describe the concentration overpotential [14]. Furthermore, a modified ButlereVolmer (BeV) equation was derived and validated for the reduction of CO 2 , and employed in interfacial and distributed charge transfer models to assess electrochemical characteristics and O 2 production ability [15].…”

Section: Introductionmentioning

confidence: 99%

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A model-based understanding of solid-oxide electrolysis cells (SOECs) for syngas production by H2O/CO2 co-electrolysis

Menon

Janardhanan

et al. 2015

Journal of Power Sources

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100

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Section: Electrochemistrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A model-based understanding of solid-oxide electrolysis cells (SOECs) for syngas production by H2O/CO2 co-electrolysis

Menon

Janardhanan

et al. 2015

Journal of Power Sources

Self Cite

100

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“…Under such conditions, the assumption of H 2 as the only electrochemically active species becomes inadequate. The evaluation of exchange current density for CO oxidation is possible based on elementary charge transfer kinetics [28], but requires additional experimental data from the same cell to evaluate them. However, in general, the electrochemical oxidation rate of CO is negligible compared to that of H 2 oxidation [29].…”

Section: Resultsmentioning

confidence: 99%

Internal reforming of biogas in SOFC: a model based investigation

Janardhanan

2015

J Solid State Electrochem

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This paper presents a multiphysics model for the simulation of solid oxide fuel cell operating on biogas without external reforming. The model accounts for multicomponent species transport, heterogeneous reaction kinetics on Ni cermet anode, H 2 electrochemical oxidation, and charge transport in the cermet electrodes and electrolyte. The model uses only three adjustable parameters that are fitted against one set of experimental data and then kept constant throughout the study. The model predicted voltage fluctuations are in excellent agreement with experimental measurements reported in the literature. The model also reveals that the assumption of H 2 as the only electrochemically active species is probably inadequate to explain the behavior of cells operating directly on biogas. Thermodynamic analysis is further performed to support this claim made based on model predictions. The model results demonstrate that the thickness of electrochemically active layer is independent of fuel composition under fuel rich conditions, however, thins down as the fuel becomes more and more diluted.

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“…The modified Butler-Volmer equation, also known as Erdey-Grúz-Volmer equation, for the electrochemical reduction of carbon dioxide can be written as follows [20]:…”

Section: Electrochemistrymentioning

confidence: 99%

Effect of Design Parameters on the Internal Steam Reforming of Methane in Solid Oxide Fuel Cell Systems

Chen¹

2017

AJME

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Abstract:The operation of solid oxide fuel cell systems with the internal steam reforming of methane over supported nickel catalysts is studied. A mathematical model including heterogeneous chemistry, electro-chemistry, mass transport, and porous media transport is developed to explore the thermal energy coupling between the steam reforming and the electrochemical reactions, independent of the geometrical structure. The role of catalyst activity, inlet temperature, current density, and operating pressure in the system behavior is evaluated. A sensitivity analysis is also performed for different design parameters. The effect of flow configuration on the operation of the system is analyzed and compared based on multiple performance criteria. It is shown that the internal steam reforming within the fuel cell system can result in an overall auto-thermal operation which increases efficiency and simplifies the design process. However, a local cooling effect may occur close to the entrance of the reformer. The use of less active catalysts can cause the slippage of the methane. To reduce both the overall temperature increase across the fuel cell and the local cooling caused by the endothermic steam reforming reactions, increasing the operating pressure is found to be an effective approach. High system efficiency is obtained with increasing the operating pressure or decreasing the current density. The more efficient system is found for a co-flow configuration, while significant temperature gradients near the entrance of the reformer are not desirable for ceramic solid oxide fuel cell systems.

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Modeling CO2 electrolysis in solid oxide electrolysis cell

Cited by 32 publications

References 21 publications

A model-based understanding of solid-oxide electrolysis cells (SOECs) for syngas production by H2O/CO2 co-electrolysis

A model-based understanding of solid-oxide electrolysis cells (SOECs) for syngas production by H2O/CO2 co-electrolysis

Internal reforming of biogas in SOFC: a model based investigation

Effect of Design Parameters on the Internal Steam Reforming of Methane in Solid Oxide Fuel Cell Systems

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