Study of the tortuosity factors at multi-scale for a novel-structured SOFC anode

X-Ray Microscopy Conference 2016

Lu, X.^1 ; Li, T.^2 ; Taiwo, O.O.^1 ; Bailey, J.^1 ; Heenan, T.^1 ; Li, K.^2 ; Brett, D.J.L.^1 ; Shearing, P.R.^1

Department of Chemical Engineering, University College London, London

WC1E 7JE, United Kingdom^1

Department of Chemical Engineering, Imperial College London, London

SW7 2AZ, United Kingdom^2

关键词: Electrode material;    Gas transport properties;    Image-based techniques;    Multi-scale imaging;    Orders of magnitude;    Phase inversion techniques;    Tortuosity factor;    X-ray computed tomography;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/849/1/012020/pdf
DOI  :  10.1088/1742-6596/849/1/012020

来源: IOP

【 摘 要 】

Gas transport properties are closely related to the tortuosity of the pore network within porous materials. For the first time, this study explores a multi-scale imaging and modelling method to measure the tortuosity of an Solid Oxide Fuel Cell (SOFC) electrode material with pore sizes spanning over hundreds of orders of magnitude. This analysis is normally challenging using image-based techniques, as pores of different sizes may not be easily resolved at the same time using X-ray computed tomography (CT). In this study, a tubular SOFC anode, fabricated by a phase inversion technique, is used to illustrate this approach. A heat flux analogy is used to simulate mass transport and the results show that the embedded large-scale finger-like pores can significantly improve mass transport by providing less tortuous pathways.