Multiscale modelling potentialities for solid oxide fuel cell performance and degradation analysis

Abstract

Based on a multiscale approach, the in-home built Fortran code SIMFC allows for high-temperature fuel cell simulation from material intrinsic properties to system overall operation.

A kinetic study on oxygen redox reaction of a double-perovskite reversible oxygen electrode— Part II: Modelling analysis

“…At intermediate temperatures, the performance is still acceptable: for instance, working at 700 • C implies 20 mV over 200 mAcm −2 , and at 650 • C a value of 30 mV is detected under 150 mAcm −2 with the charge transfer overpotentials never exceeding 25 mV. Here, the SBCCO material can guarantee a fairly high electrode performance despite lower temperatures, avoiding the development of severe degradation issues, which characterise high-temperature operation [46,47]. This point is a significant improvement with respect to conventional oxygen electrodes [48], favouring SBCCO application in intermediate-temperature SOCs [49].…”

High Temperature Solid Oxide Electrolysis – Technology and Modeling

“…To consider this polarization contribution, the concentration of species at the reaction site must be determined. Simplified analytical expressions for the concentration profile in the electrode can be applied by assuming a linear [40,56,150,151] or exponential [54,150] profile or using a limiting current expression [152,153]. A more detailed insight into the species distribution at the reaction site is obtained using mass transport models that spatially resolve the species concentration.…”

“…Larger Ni particles lead to a decrease in TPB density, percolation and thus performance. This is implemented via a time-dependent expression for the Ni particle radius or TPB [150,151,[259][260][261] or by using the phase field method [48,262]. Deactivation by chromium poisoning in LSM-YSZ oxygen electrodes is treated in a similar fashion adopting time dependent TPB lengths and chromium partial pressure dependent reaction rates [150,151,260,261].…”

Temperature gradient reduction in a tubular direct ammonia solid oxide fuel cell by fluidizing the cathode particles

“…7 In addition, SOFCs typically operate at temperatures of around 700–1000 °C. 8,9 Such high operating temperatures can provide conditions to directly crack ammonia into H 2 and N 2 for electricity generation. 10…”

“…7 In addition, SOFCs typically operate at temperatures of around 700-1000 °C. 8,9 Such high operating temperatures can provide conditions to directly crack ammonia into H 2 and N 2 for electricity generation. 10 Direct ammonia solid oxide fuel cells (DA-SOFCs) are a type of fuel cell that has the unique ability to utilize ammonia directly as a fuel, without the requirement of an additional ammonia decomposition unit.…”