Microstructure optimization of porous mixed ionic and electronic conducting cathode for solid oxide fuel cells

He, Aihua; Onishi, Junya; Gong, Jiaming; Shikazono, Naoki

doi:10.1016/j.jpowsour.2020.228771

Cited by 21 publications

(3 citation statements)

References 40 publications

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“…He et al applied the numerical simulation using level-set and adjoint methods to optimize the porous LSCF microstructure [452][453][454]. It was shown that the spherical LSCF solid particles were preferable for performance improvement [452].…”

Section: Improvement Of the Electrode-electrolyte Interfacementioning

confidence: 99%

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Филонова

Pikalova

2023

Materials

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The progressive research trends in the development of low-cost, commercially competitive solid oxide fuel cells with reduced operating temperatures are closely linked to the search for new functional materials as well as technologies to improve the properties of established materials traditionally used in high-temperature devices. Significant efforts are being made to improve air electrodes, which significantly contribute to the degradation of cell performance due to low oxygen reduction reaction kinetics at reduced temperatures. The present review summarizes the basic information on the methods to improve the electrochemical performance of conventional air electrodes with perovskite structure, such as lanthanum strontium manganite (LSM) and lanthanum strontium cobaltite ferrite (LSCF), to make them suitable for application in second generation electrochemical cells operating at medium and low temperatures. In addition, the information presented in this review may serve as a background for further implementation of developed electrode modification technologies involving novel, recently investigated electrode materials.

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Section: Improvement Of the Electrode-electrolyte Interfacementioning

confidence: 99%

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Филонова

Pikalova

2023

Materials

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“…As a matter of fact, the explorations of the correlation between microstructures and mechanical properties and electrochemical performance of SOFC electrodes (anode and cathode) have been attempted for over decades through both experimental (7-9) and numerical investigations (10)(11)(12). With the advent of the 3D microstructure analytical techniques such as X-ray tomography and FIB-SEM tomography, the mechanical properties and electrochemical performance can be evaluated based on the 3D microstructures of the electrodes by established physical models.…”

Section: Introductionmentioning

confidence: 99%

Correlation Between Microstructure and Macroscopic Properties of Solid Oxide Fuel Cell Composite Anode: Mesoscale Modeling and Deep Learning with Convolutional Neural Network

et al. 2021

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In this paper, we propose a framework for studying the linkage between microstructures and macroscopic properties of Ni-YSZ anode in solid oxide fuel cells (SOFCs) by using meso-scale modeling and deep learning. The discrete element method and the mesoscale kinetic Monte Carlo method were used to generate Ni-YSZ anodes with various microstructures. Then, effective mechanical properties of the representative anodes were evaluated using finite element modeling and the homogenization theory. The triple phase boundary length density (L TPB) was also calculated. The convolutional neural network (CNN) based deep learning model was trained to obtain the functional relationship between the microstructures and the mechanical properties and L TPB. The deep learning model was finally well validated against new samples with excellent predictive performances. This indicates that the CNN model can be used as a surrogate model for rapid direct access to macroscopic properties of composite anodes and for macroscale continuum modeling of SOFCs.

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“…Furthermore, the subsequent 3D numerical simulation 11 disclosed that the local activation overpotential and current density are highly distributed in a microstructure scale, which cannot be captured by continuum level EMT. In addition to the fundamental studies of electrode reactions, computational optimization of electrode microstructures by using Level-set function (for LSCF cathode) 12 or genetic algorithm and particle swarm optimization (for Ni/YSZ anode) 13 have been proposed. These optimization problems are conducted to maximize the reaction current based on numerical simulations.…”

mentioning

confidence: 99%

Distribution of Reaction Sites in SOFC Cathode through Oxygen Isotope Labeling with Three-Dimensional Microstructural Analysis

Nagasawa

Shimura

Shikazono

et al. 2021

J. Electrochem. Soc.

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Distribution of electrochemical reaction sites in a composite cathode of solid oxide fuel cell is investigated through active sites imaging by oxygen isotope labeling combined with three-dimensional microstructure observation by focused ion beam–scanning electron microscopy (FIB-SEM). Power generation with oxygen isotope and subsequent cell quenching is conducted at 973 K for LSM/YSZ cathode using a button cell. Through FIB-SEM observation and secondary ion mass spectroscopy (SIMS) analysis, the 3D microstructure of the quenched cathode with 2D 18O concentration mapping in the middle plane of the characterized volume is obtained. Some LSM particles which show quite weak 18O concentration are identified as the isolated phase, while several percolated LSMs near the electrolyte also show quite weak 18O concentration, which indicates the existence of inactive reaction sites or ion/electron paths even inside the percolated phases. In addition, the oxide ion flux incorporated from the cathode/electrolyte interface is estimated from the 18O concentration profiles at two locations in the observed area. A clear difference between the calculated oxide ion fluxes at the two locations is observed, which is discussed with the distributions of percolated TPB density and YSZ volume fraction in terms of the effective reaction thickness.

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Microstructure optimization of porous mixed ionic and electronic conducting cathode for solid oxide fuel cells

Cited by 21 publications

References 40 publications

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Correlation Between Microstructure and Macroscopic Properties of Solid Oxide Fuel Cell Composite Anode: Mesoscale Modeling and Deep Learning with Convolutional Neural Network

Distribution of Reaction Sites in SOFC Cathode through Oxygen Isotope Labeling with Three-Dimensional Microstructural Analysis

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