Abstract
The practical operation of solid oxide electrolysis cell (SOEC) involves complex physicochemical coupling processes between “multi-physics fields” at “multiple scales”. Mathematical simulation and modeling can explain the inherent connections and influencing mechanisms of multi-physics fields at different scales, which are crucial for the study of SOEC’s basic electrochemical characteristics and the development of engineering applications. In this chapter, we mainly summarize different simulation techniques for SOEC from the perspective of spatial scale categories. Models related to single cells and stacks are mainly based on the continuum hypothesis, and the macroscopic characteristics such as the distribution of multi-physics fields, input/output power, and cell efficiency inside single cells/stacks are obtained through traditional computational fluid dynamics using finite volume method or finite element method. This article first introduces the relevant conservation equations and modeling methods of macroscopic models based on the continuum hypothesis. Then, numerical simulation methods for heterogeneous electrode structures at the electrode scale are introduced, including the lattice Boltzmann method, kinetic Monte Carlo method, and phase field method. Finally, we also introduce the application of machine learning methods in SOEC simulation and provide prospects for future research.
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Abbreviations
- C :
-
Conserved order parameters
- \(C_{i}\) :
-
Molar concentration of species i (mol m-3)
- d p :
-
Average diameter of pore (μm)
- D i,k :
-
Knudsen diffusion coefficients (m2 s-1)
- D i,j :
-
Binary diffusion coefficients (m2 s-1)
- E act :
-
Activation energy (J mol-1)
- F :
-
The Faraday constant (C mol-1)
- F total :
-
Total free energy of the system
- f 0 :
-
Bulk free energy density
- J :
-
Electrochemical reaction rate (A m-3 s-1)
- j 0 :
-
Exchange current density (A m-3)
- K :
-
Permeability (m2)
- K pr :
-
Equilibrium constant of MSR
- K ps :
-
Equilibrium constant of WGSR
- k rf :
-
Forward reaction rate constant for MSR
- k sf :
-
Forward reaction rate constant for WGSR
- M :
-
Average molar mass (kg mol-1)
- M C :
-
Mobility of conserved order parameters
- n e :
-
Number of electrons transferred per reaction
- P :
-
Pressure (Pa)
- p :
-
Partial pressure (Pa)
- r p :
-
Pore diameter (m)
- T :
-
Temperature (K)
- V i :
-
Special Fuller diffusion volume (cm-3 mol-1)
- W ca :
-
Wettability parameter
- φ :
-
Electric potential (V)
- η i :
-
Non-conserved order parameters
- η act :
-
Activation overpotential
- κ :
-
Gradient energy coefficients
- κ eff :
-
Effective thermal conductivity (W m-1 K-1)
- σ :
-
Conductivity (S m-1)
- ρ :
-
Density (kg m-3)
- μ :
-
Dynamic viscosity (N s m-2)
- ε :
-
Porosity
- ω i :
-
Weight coefficients
- τ :
-
Tortuosity
- τ i :
-
Relaxation coefficients
- act:
-
Activation
- bulk:
-
Bulk diffusion
- conc:
-
Concentration
- ele:
-
Electron
- ion:
-
Ion
- N:
-
Ni
- ohm:
-
Ohmic
- Y:
-
YSZ
- P:
-
Pore
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Wang, Y., Wu, C., Jiao, K., Du, Q., Ni, M. (2023). Modeling of Solid Oxide Electrolysis Cells. In: Laguna-Bercero, M.A. (eds) High Temperature Electrolysis. Lecture Notes in Energy, vol 95. Springer, Cham. https://doi.org/10.1007/978-3-031-22508-6_8
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