Exchange current density of reversible solid oxide cell electrodes

Fukumoto, Tazuru; Endo, Naoki; Natsukoshi, Katsuya; Tachikawa, Yuya; Harrington, George F.; Lyth, Stephen M.; Matsuda, Junko; Sasaki, Kazunari

doi:10.1016/j.ijhydene.2022.03.164

Cited by 13 publications

(8 citation statements)

References 51 publications

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“…Therefore, the same factors can be used for SOFC and SOEC modelling. 34 It is important to acknowledge that this represents a simplification, as the exchange current density can be subject to modifications due to irreversible processes, potentially resulting in distinct exchange current densities as indicated by Fukumoto et al 35 However, if different electrode materials are used for SOFC and SOEC operation, other activation energies and pre-exponential factors must be taken into account to calculate the exchange current density. Fukumoto et al 35 have determined the exchange current densities of different cathode and anode materials for solid oxide cells in SOEC and SOFC operation.…”

Section: Methodsmentioning

confidence: 99%

Comparative Analysis of Loss Mechanism Localization in a Semi-2D SOEC Single Cell Modell: Non-Equilibrium Thermodynamics versus Monocausal-Based Approach

Gedik,

Wachtel,

Kabelac

2024

ECS Adv.

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This study aims to theoretically analyze the local entropy production rate in a solid oxide electrolyzer cell (SOEC) single cell at T = 1123.15 K and p = 1 bar. Local entropy rates signify loss mechanisms, crucial for cell design and optimization. A semi-2D SOEC model based on non-equilibrium thermodynamics is developed, supplemented by monocausal correlations for direct comparison. The model is validated using KeraCell III data and grid independence analysis. Simulations of electric current density, temperature, heat flow, and local entropy production for various SOEC operating modes are presented. Coupled transport mechanisms significance is discussed, highlighting the pronounced impact of the Peltier effect on heat flux and temperature. The importance of the Peltier effect in SOECs compared to SOFCs is emphasised. The effects of the Seebeck effect on the potential distribution are superimposed by the dominant ohmic losses in the electrolyte. The localisation of entropy production rates shows for exothermic operation that 66.64 % of the total losses are due to the predominantly dominant irreversible ion transport in the electrolyte, while the entanglements in the reaction layers contribute 33.02 % and GDLs less than 1 %.

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Section: Methodsmentioning

confidence: 99%

Comparative Analysis of Loss Mechanism Localization in a Semi-2D SOEC Single Cell Modell: Non-Equilibrium Thermodynamics versus Monocausal-Based Approach

Gedik,

Wachtel,

Kabelac

2024

ECS Adv.

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“…𝑛 is the number of electrons, 𝑛 = 2 for the anode, and 𝑛 = 4 for the cathode. The exchange current densities in the cathode and anode obtained in our previous work were applied (8,9). In this study, the phenomenological equations presented in Equations [2] and [3], which depend on the gas partial pressure and temperature at the cathode and anode, were used to calculate the exchange current densities.…”

Section: Simulation Methods and Exchange Current Density Equationmentioning

confidence: 99%

Effects of Current Collector on Internal Visualization of Solid Oxide Cells

Yoshiga,

Okamoto,

Tachikawa

et al. 2023

ECS Trans.

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Visualization of reactions occurring inside a solid oxide cell (SOC) during operation is difficult due to the limitation of the operatable temperature to use various sensors and measurement equipment. Therefore, we are investigating a visualization method to combine three-dimensional simulation with in-operando temperature observation inside SOCs. In this study, we focused on evaluating the effect of a current collector shape on the cell performance and temperature distribution. As a result, we confirmed that the effects of several current collector shape modifications appeared in the temperature distribution. Based on the calculated temperature and current density distributions, we proposed an appropriate current collector shape for observing the temperature distribution inside the cell by experiment. Using the practical observation setup model considered in this study, the influence of sulfur poisoning on the temperature distribution was also calculated and evaluated.

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“…i 0 is usually considered as a parameter that is related to operating conditions during the numerical simulation process, and thus used to reflect the difficulty of an electrode reaction under corresponding conditions. 33 Based on the experimental data, a typical nonlinear empirical model was proposed to correlate i 0 with operating parameters to accurately describe the electrode reactions during the simulation, as shown in Equation (10).…”

Section: Porous Electrodementioning

confidence: 99%

Mass transfer and electrochemical behavior of nitrate reduction to ammonia in electrocatalytic flow cell reactor

Lv,

Chen,

Bai

et al. 2023

AIChE Journal

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The electrochemical nitrate reduction reaction (e‐NITRR) process based on plasma has become a potential technology for commercial large‐scale green ammonia synthesis. This work emphasized the prominent influence of operating parameters on e‐NITRR through the combination of experiments and simulations in an electrocatalytic flow cell reactor. An integrated model was developed and the non‐linear functions between operating conditions and exchange current density were obtained by optimization fitting. The average relative error of experiments and simulations was <5%, which can provide solutions for the design of reactor structures and optimization of process parameters. Besides, the results also showed that the tandem steps of NO3− → NO2− and NO2− → NH3 were, respectively, controlled by mass transfer and electrochemical kinetics at low electrolyte flow rate, and this characteristic makes the increase in electrode dimensions have the opposite effect on the formation rate of NO2− and NH3.

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Exchange current density of reversible solid oxide cell electrodes

Cited by 13 publications

References 51 publications

Comparative Analysis of Loss Mechanism Localization in a Semi-2D SOEC Single Cell Modell: Non-Equilibrium Thermodynamics versus Monocausal-Based Approach

Comparative Analysis of Loss Mechanism Localization in a Semi-2D SOEC Single Cell Modell: Non-Equilibrium Thermodynamics versus Monocausal-Based Approach

Effects of Current Collector on Internal Visualization of Solid Oxide Cells

Mass transfer and electrochemical behavior of nitrate reduction to ammonia in electrocatalytic flow cell reactor

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