Mathematical modeling analysis of regenerative solid oxide fuel cells in switching mode conditions

Jin, Xinfang; Xue, Xingjian

doi:10.1016/j.jpowsour.2010.04.018

Cited by 67 publications

(33 citation statements)

References 21 publications

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“…The diffusion equation is then adopted for species transport characteristics.

\nabla • (- D_{ϕ}^{italiceff} \nabla C_{ϕ}) = {([], \frac{A}{V})}_{italiceff} S_{ϕ}

where, ϕ = O 2 , H 2 , VW for oxygen, hydrogen, and water vapor, respectively.

{[\frac{A}{V}]}_{eff}

= the specific surface area that is the electrochemical reaction active area per unit volume

D_{ϕ}^{eff}

is the effective diffusivity in the porous electrode, which mainly depends on two mechanisms : molecular diffusion and Knudsen diffusion. If the pore size is smaller than the gas mean free path, the molecule–pore wall interaction surpasses the molecule–molecule interaction, causing the Knudsen diffusion to be dominant.…”

Section: Mathematical Modelmentioning

confidence: 99%

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Analytically investigating the characteristics of a high-temperature unitized regenerative solid oxide fuel cell

Ferng

Wang

et al. 2013

Int. J. Energy Res.

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SUMMARYA unitized regenerative solid oxide fuel cell (URSOFC) can be considered as a next-generation power source and a storage device in the future since it can generate electricity in the SOFC mode and also produce H 2 /O 2 in the solid oxide electrolyzer cell (SOEC) mode. In this paper, a two-dimensional axisymmetric model is developed to simulate the characteristics of a URSOFC. The performance curves for an in-house button URSOFC under different operating temperatures of 600, 700, and 800 C are measured to validate the present model. Both the measured data and the prediction results reveal the beneficial effects of higher temperature on the cell performance. Based on the results of numerical simulations, the majority of the fuel gas is consumed at the interface of the electrolyte and the electrode, causing a great fuel concentration gradient near the interface. In addition, the predicted cell performance curves in both the SOFC and the SOEC modes correspond well with the measured data, demonstrating the applicability of this model in a button URSOFC.

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“…The diffusion equation is then adopted for species transport characteristics.

\nabla • (- D_{ϕ}^{italiceff} \nabla C_{ϕ}) = {([], \frac{A}{V})}_{italiceff} S_{ϕ}

where, ϕ = O 2 , H 2 , VW for oxygen, hydrogen, and water vapor, respectively.

{[\frac{A}{V}]}_{eff}

= the specific surface area that is the electrochemical reaction active area per unit volume

D_{ϕ}^{eff}

Section: Mathematical Modelmentioning

confidence: 99%

“…The Butler–Volmer equation is used to predict the cell current density. The current densities in the hydrogen electrode (

J_{H_{2}}

) and the oxygen electrode (

J_{O_{2}}

) can be expressed as follows :…”

Section: Mathematical Modelmentioning

confidence: 99%

Analytically investigating the characteristics of a high-temperature unitized regenerative solid oxide fuel cell

Ferng

Wang

et al. 2013

Int. J. Energy Res.

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“…This model indicates that different electrochemical parameters are appropriate to fit dual‐mode operation, which depends on both gas compositions and material microstructures . In addition, dynamic switching is also modeled to investigate the switching performance between an SOFC and an SOEC …”

Section: Introductionmentioning

confidence: 99%

CFD modeling and performance comparison of solid oxide fuel cell and electrolysis cell fueled with syngas

et al. 2018

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Summary Reversible solid oxide fuel cells (rSOFCs) may be applied to store and generate electrical energy in a reversible mode. This technique is promising to balance the conflict between intermittent power supply and demand in a sustainable way. One of the limitations of the development of rSOFCs is the high cost of storage and usage of pure H2, which may be solved by employing syngas as the fuel. The performance of rSOFCs depends on the development of bifunctional materials, cell design, and operation optimization, which are often investigated and predicted by the cost‐effective approach of mathematical modeling. However, the modeling of dual‐mode rSOFCs involving co‐redox reactions with syngas is not well developed. In this study, a two‐dimensional (2D) single‐channel model of an rSOFC is developed. The novelty of this model is that the multiphysics transport processes are fully coupled and solved with the reversible water‐gas shift reaction with syngas and the electrochemical reactions. The effects of the operating conditions and design parameters (eg, electrode thickness) are considered, with the aim of providing guidelines to optimize the design and operation of reversible cells. It is concluded that the thickness of the electrode has a larger impact on the water‐gas shift reaction than on the electrochemical reaction in both the gas diffusion and reaction regions. The C/H element ratio of syngas has a negative correlation with power output, but the distributions of current and gas species may be improved in both modes. A higher operating temperature improves the performance in both modes but has a more substantial effect in the electrolysis mode. The specific design and operating schemes favored in different modes should be balanced in the reversible mode.

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“…Hence, the performance degrades rapidly [4]. Meanwhile, there are complicated transient interactions between electrochemical reactions and transport processes during the operation mode switching [27]. Jin et al [27] built an isothermal two-dimensional (2D) transient model for regenerative solid oxide fuel cells to investigate complicated multi-physics process during the process of mode switching.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, there are complicated transient interactions between electrochemical reactions and transport processes during the operation mode switching [27]. Jin et al [27] built an isothermal two-dimensional (2D) transient model for regenerative solid oxide fuel cells to investigate complicated multi-physics process during the process of mode switching. Simulation results indicated the trend of internal parameter distributions, such as H 2 /O 2 /H 2 O and ionic, electronic potentials.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Simulation of Mass Transfer in Unitized Regenerative Fuel Cells under Operation Mode Switching

Wang

Guo

et al. 2016

Energies

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Abstract:A two-dimensional, single-phase, isothermal, multicomponent, transient model is built to investigate the transport phenomena in unitized regenerative fuel cells (URFCs) under the condition of switching from the fuel cell (FC) mode to the water electrolysis (WE) mode. The model is coupled with an electrochemical reaction. The proton exchange membrane (PEM) is selected as the solid electrolyte of the URFC. The work is motivated by the need to elucidate the complex mass transfer and electrochemical process under operation mode switching in order to improve the performance of PEM URFC. A set of governing equations, including conservation of mass, momentum, species, and charge, are considered. These equations are solved by the finite element method. The simulation results indicate the distributions of hydrogen, oxygen, water mass fraction, and electrolyte potential response to the transient phenomena via saltation under operation mode switching. The hydrogen mass fraction gradients are smaller than the oxygen mass fraction gradients. The average mass fractions of the reactants (oxygen and hydrogen) and product (water) exhibit evident differences between each layer in the steady state of the FC mode. By contrast, the average mass fractions of the reactant (water) and products (oxygen and hydrogen) exhibit only slight differences between each layer in the steady state of the WE mode. Under either the FC mode or the WE mode, the duration of the transient state is only approximately 0.2 s.

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Mathematical modeling analysis of regenerative solid oxide fuel cells in switching mode conditions

Cited by 67 publications

References 21 publications

Analytically investigating the characteristics of a high-temperature unitized regenerative solid oxide fuel cell

Analytically investigating the characteristics of a high-temperature unitized regenerative solid oxide fuel cell

CFD modeling and performance comparison of solid oxide fuel cell and electrolysis cell fueled with syngas

Two-Dimensional Simulation of Mass Transfer in Unitized Regenerative Fuel Cells under Operation Mode Switching

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