Multi-length scale microstructural design of micro-tubular Solid Oxide Fuel Cells for optimised power density and mechanical robustness

Lu, Xuekun; Bertei, Antonio; Heenan, Thomas M. M.; Wu, Yunsong; Brett, Dan J. L.

doi:10.1016/j.jpowsour.2019.226744

Cited by 11 publications

(2 citation statements)

References 64 publications

(73 reference statements)

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“…Notably, this approach is surely simplistic and does not consider transport mechanisms such as Knudsen diffusion, which is significant in case of nanopores. Knudsen diffusion has been explicitly considered by Lu et al [15,90] via Direct Simulation Monte Carlo, although the diffusion simulation is not directly coupled to electrochemical reactions and other transport phenomena. Electrochemical reactions take place at the triple phase boundaries (TPBs) in SOFC cermet electrodes.…”

Section: Simulations Of Transport and Reaction Processes 311 Sofcsmentioning

confidence: 99%

Progress in 3D electrode microstructure modelling for fuel cells and batteries: transport and electrochemical performance

Zhang¹,

Bertei²,

Tariq³

et al. 2019

Prog. Energy

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Electrode microstructure plays an important role in the performance of electrochemical energy devices including fuel cells and batteries. Building a clear understanding of how the performance is affected by the electrode microstructure is necessary to design the optimal electrode microstructure, to achieve better device performance. 3D microstructure modelling enables us to perform simulations directly on a 3D electrode microstructure and thus link structure with performance. This paper provides an extensive review on the current state of the art in 3D microstructure modelling of transport and electrochemical performance for four promising electrochemical energy technologies: solid oxide fuel cells (SOFCs), proton exchange membrane fuel cells (PEMFCs), redox flow batteries (RFBs) and lithium ion batteries (LIBs). Each technology has different electrode microstructures and processes, and thus presents different challenges. The most commonly used modelling methods including the finite element method (FEM) and the finite volume method (FVM) are reviewed, together with the developing lattice Boltzmann method (LBM), with the advantages and disadvantages of each method revealed. Whilst FEM and FVM have been extensively applied in simulating SOFC and LIB electrodes where the methods are capable of dealing with single phase (gas or liquid) transport, they face challenges in simulating the multiphase phenomenon present in PEMFC and some RFB electrodes. LBM is, on the other hand, well suited in simulating gas-liquid two phase flow and applications in PEMFCs and RFBs, as well as single-phase phenomenon in SOFCs and LIBs. The review also points to current challenges in 3D microstructure modelling, including the

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Section: Simulations Of Transport and Reaction Processes 311 Sofcsmentioning

confidence: 99%

Progress in 3D electrode microstructure modelling for fuel cells and batteries: transport and electrochemical performance

Zhang¹,

Bertei²,

Tariq³

et al. 2019

Prog. Energy

Self Cite

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“…High-resolution X-ray imaging techniques have become increasingly capable and popular for viewing and analyzing internal geometries for a wide range of materials. X-ray computed tomography (CT) has been successfully used to enhance the design of battery materials, whereby physical characteristics including porosity and pore size can be evaluated before, during, and after use [ 25 – 27 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluating 3D-printed bioseparation structures using multi-length scale tomography

et al. 2023

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X-ray computed tomography was applied in imaging 3D-printed gyroids used for bioseparation in order to visualize and characterize structures from the entire geometry down to individual nanopores. Methacrylate prints were fabricated with feature sizes of 500 µm, 300 µm, and 200 µm, with the material phase exhibiting a porous substructure in all cases. Two X-ray scanners achieved pixel sizes from 5 µm to 16 nm to produce digital representations of samples across multiple length scales as the basis for geometric analysis and flow simulation. At the gyroid scale, imaged samples were visually compared to the original computed-aided designs to analyze printing fidelity across all feature sizes. An individual 500 µm feature, part of the overall gyroid structure, was compared and overlaid between design and imaged volumes, identifying individual printed layers. Internal subvolumes of all feature sizes were segmented into material and void phases for permeable flow analysis. Small pieces of 3D-printed material were optimized for nanotomographic imaging at a pixel size of 63 nm, with all three gyroid samples exhibiting similar geometric characteristics when measured. An average porosity of 45% was obtained that was within the expected design range, and a tortuosity factor of 2.52 was measured. Applying a voidage network map enabled the size, location, and connectivity of pores to be identified, obtaining an average pore size of 793 nm. Using Avizo XLAB at a bulk diffusivity of 7.00 × 10−11 m2s−1 resulted in a simulated material diffusivity of 2.17 × 10−11 m2s−1 ± 0.16 × 10−11 m2s−1. Graphical abstract

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Numerical simulation and optimization of operating and structural parameters for solid oxide fuel cell

Liao

Jie

Zhang

et al. 2021

J Solid State Electrochem

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Multi-length scale microstructural design of micro-tubular Solid Oxide Fuel Cells for optimised power density and mechanical robustness

Cited by 11 publications

References 64 publications

Progress in 3D electrode microstructure modelling for fuel cells and batteries: transport and electrochemical performance

Progress in 3D electrode microstructure modelling for fuel cells and batteries: transport and electrochemical performance

Evaluating 3D-printed bioseparation structures using multi-length scale tomography

Numerical simulation and optimization of operating and structural parameters for solid oxide fuel cell

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