Electrolytic effect in solid oxide fuel cells running on steam/methane mixture

Ni, Meng

doi:10.1016/j.jpowsour.2010.09.069

Cited by 19 publications

(20 citation statements)

References 66 publications

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“…As the electrochemical model, chemical model and the CFD model have been validated respectively in the previous publications [24,26], the validation of the models is not repeated here. The dimensions and typical structural/operating parameters used are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…The boundary conditions and the detailed calculation procedures can be found in the previous publication [24,26]. The iteration scheme is shown in Figure 2.…”

Section: Numerical Methodologymentioning

confidence: 99%

“…The negative sign for the cathode means the mass (oxygen) is electrochemically consumed. The Darcy's law is used as source terms ( x S and y S ) in momentum equations (Table 3) so that the momentum equations are valid for both the gas channels and the porous electrodes [24,26]. The source term (S T , W.m ) and irreversible overpotentials ( t  ); (2) heat energy consumption by DIR reaction (Eq.…”

Section: Computational Fluid Dynamics (Cfd) Modelmentioning

confidence: 99%

“…Besides, both DIR and WGS reactions require steam in the anode, which can dilute the fuel concentration and reduce the SOFC performance [22,23]. In a recent study, it is found that running on methane/steam mixture without external reforming, the electrolytic effect is observed in an SOFC, at an operating potential of 0.8V [24]. This electrolytic effect in SOFC is due to the non-uniform electrolyte Nernst potential and uniform operating potential along the SOFC channel.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of SOFC running on partially pre-reformed gas mixture

2012

International Journal of Hydrogen Energy

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125

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A two dimensional model is developed to study the transport and reaction processes in solid oxide fuel cells (SOFCs) fueled by partially pre-reformed gas mixture, considering the direct internal reforming (DIR) of methane and water gas shift (WGS) reaction in the porous anode of SOFC.Electrochemical oxidations of H 2 and CO fuels are both considered. The model consists of an electrochemical, a chemical model, and a computational fluid dynamics (CFD) model. Two chemical models are compared to examine their effects on SOFC modeling results. Different from the previous studies on hydrogen fueled SOFC, higher gas velocity is found to slightly decrease the performance of SOFC running on pre-reformed gas mixture, due to suppressed gas composition variation at a higher gas velocity. The current density distribution along the gas channels at an inlet temperature of 1173K is quite different from that at 1073K, as DIR reaction is facilitated at a higher temperature. It is also found that neglecting the electrochemical oxidation of CO can considerably underestimate the total current density of SOFC running on pre-reformed hydrocarbon fuels. An alternative method is proposed to numerically determine the open-circuit potential of SOFC running on hydrocarbon fuels. Electrochemical reactions are observed at open-circuit potentials.

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Section: Resultsmentioning

confidence: 99%

“…The boundary conditions and the detailed calculation procedures can be found in the previous publication [24,26]. The iteration scheme is shown in Figure 2.…”

Section: Numerical Methodologymentioning

confidence: 99%

Section: Computational Fluid Dynamics (Cfd) Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of SOFC running on partially pre-reformed gas mixture

2012

International Journal of Hydrogen Energy

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125

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“…The WGSR is slightly exothermic and tends to increase the SOFC temperature. However, as the rate of the WGSR is usually much lower than that of MSRR, [12] its effect is neglected in the present study for simplicity. According to the authors best knowledge, no experiments have been conducted exploring the temperature field of SOFC porous electrodes.…”

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confidence: 99%

Local Non‐Equilibrium Thermal Effects in Solid Oxide Fuel Cells with Various Fuels

Zheng

Sun

2012

Energy Tech

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Local thermal equilibrium (LTE) is a common assumption used in thermal modeling of solid oxide fuel cells (SOFCs). However, its validity has not been fully verified. To examine the validity of the LTE assumption, a thermal model has been developed to evaluate the local thermal non‐equilibrium effect of SOFC electrodes with various fuels, considering methane internal reforming and ammonia thermal cracking in the anode. Although the local thermal non‐equilibrium effect for ammonia‐fed SOFCs was more pronounced than that for hydrogen‐fed SOFCs, the local thermal equilibrium assumption can be safely adopted for SOFC modeling for a wide range of operating/structural parameters and for various fuels, such as hydrogen, ammonia, and methane.

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Local Non-Equilibrium Thermal Effects in Solid Oxide Fuel Cells with Various Fuels

Zheng

Sun

2013

Energy Technology

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Abstract:Local thermal equilibrium (LTE) is a common assumption used in thermal modeling of solid oxide fuel cells (SOFCs). However, its validity has not been well confirmed. To examine the validity of the LTE assumption, a thermal model is developed to evaluate the local thermal non-equilibrium (LTNE) effect of SOFC electrodes with various fuels, considering methane internal reforming and ammonia thermal cracking in anode. Although the LTNE effect for ammonia fed SOFC is more pronounced than that for hydrogen fed SOFC, the LTE assumption can be safely adopted for SOFC modeling for a wide range of operating/structural parameters and for various fuels, such as hydrogen, ammonia, and methane.

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Electrolytic effect in solid oxide fuel cells running on steam/methane mixture

Cited by 19 publications

References 66 publications

Modeling of SOFC running on partially pre-reformed gas mixture

Modeling of SOFC running on partially pre-reformed gas mixture

Local Non‐Equilibrium Thermal Effects in Solid Oxide Fuel Cells with Various Fuels

Local Non-Equilibrium Thermal Effects in Solid Oxide Fuel Cells with Various Fuels

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