Imperial College London

Professor Nigel Brandon OBE FREng

Faculty of Engineering

Dean of the Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 8600n.brandon Website

 
 
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Location

 

2.06Faculty BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bertei:2018:10.1016/j.jpowsour.2018.06.029,
author = {Bertei, A and Yufit, V and Tariq, F and Brandon, N},
doi = {10.1016/j.jpowsour.2018.06.029},
journal = {Journal of Power Sources},
pages = {246--256},
title = {A novel approach for the quantification of inhomogeneous 3D current distribution in fuel cell electrodes},
url = {http://dx.doi.org/10.1016/j.jpowsour.2018.06.029},
volume = {369},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - The electrode microstructural properties significantly influence the efficiency and durability of many electrochemical devices including solid oxide fuel cells. Despite the possibility of simulating the electrochemical phenomena within real three-dimensional microstructures, the potential of such 3D microstructural information has not yet been fully exploited. We introduce here a completely new methodology for the advanced characterization of inhomogeneous current distribution based on a statistical analysis of the current of each particle within the microstructure. We quantify the large variation in local current distributionand link it to the particle size dispersion, indicating how particle coarsening can trigger further degradation. We identify two classes of particles: those transferring more current than average, which show 10-40% more particle-particle contacts, and those producing more current than average, characterized by ~2.5 times larger three-phase boundary length per unit volume. These two classes of particles are mutually exclusive, which implies that up to the 30% of the electrode volume within the functional layer is underutilized. This fundamental insight goes well beyond the predictions of continuum modeling, allowing us to revisit the current standards regarding safe operating conditions and to suggest alternative strategies based on nanoparticle infiltration, template-assisted synthesis and additive manufacturing for designing more durable electrodes.
AU - Bertei,A
AU - Yufit,V
AU - Tariq,F
AU - Brandon,N
DO - 10.1016/j.jpowsour.2018.06.029
EP - 256
PY - 2018///
SN - 0378-7753
SP - 246
TI - A novel approach for the quantification of inhomogeneous 3D current distribution in fuel cell electrodes
T2 - Journal of Power Sources
UR - http://dx.doi.org/10.1016/j.jpowsour.2018.06.029
UR - http://hdl.handle.net/10044/1/61065
VL - 369
ER -