Review on modeling development for multiscale chemical reactions coupled transport phenomena in solid oxide fuel cells

Theoretical considerations on the modelling of transport in a three-phase electrode and application to a proton conducting solid oxide electrolysis cell

“…These forms are normally used when the activation overpotential and the concentration overpotential are calculated separately. In this study, the activation and concentration effects are both contained inside Equation (6). Other authors [13] have considered another expression of the overpotential that does not involve the equilibrium potential 0 e Φ .…”

“…Some studies have considered other forms of the Butler-Volmer equation that do not feature pre-exponential terms containing out-of-equilibrium concentrations [6,20,21]. These forms are normally used when the activation overpotential and the concentration overpotential are calculated separately.…”

“…Numerous mathematical models have been developed for fuel cells, especially for SOFCs [6] and PEMFCs [7,8]. [10] proposed a 3D model including thermal effects, Knudsen diffusion and the generalized Butler-Volmer law.…”

Three dimensional modeling of an solid oxide fuel cell coupling charge transfer phenomena with transport processes and heat generation

“…It should be noted that CFD models make it possible to reduce the amount of experiments needed for cell development, and only a limited amount of tests is then required to validate the accuracy of the models [3], as revealed in recent reviews on solid oxide fuel cell modeling and development by Grew et al [4] and Andersson et al [5]. One CFD technique is the finite element method (FEM), where the spatial domain is divided into a finite number of volumes or elements.…”

A Simple Expression for the Tortuosity of Gas Transport Paths in Solid Oxide Fuel Cells’ Porous Electrodes

“…However, there is still a lack of an effective method to determine the tortuosity in the entire porosity scope of SOFC electrodes, which leads to a big disagreement about tortuosity. As a result, the tortuosity is usually set as an empirical value randomly or used as an adjustable parameter to fit experimental data in modeling studies [17,18], which may nullify the subsequent modeling result. Based on the 3D cube packing model, the objective of this paper is to derive a simple and effective expression for tortuosity calculation and eliminate the uncertainty of tortuosity.…”