Imperial College London

Dr Samuel J Cooper

Faculty of EngineeringDyson School of Design Engineering

Lecturer
 
 
 
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Contact

 

samuel.cooper Website

 
 
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Location

 

ObservatorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Song:2019:10.1016/j.jpowsour.2019.02.068,
author = {Song, B and Bertei, A and Wang, X and Cooper, S and Ruiz-Trejo, E and Chowdhury, R and Podor, R and Brandon, N},
doi = {10.1016/j.jpowsour.2019.02.068},
journal = {Journal of Power Sources},
pages = {124--133},
title = {Unveiling the mechanisms of solid-state dewetting in Solid Oxide Cells with novel 2D electrodes},
url = {http://dx.doi.org/10.1016/j.jpowsour.2019.02.068},
volume = {420},
year = {2019}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - During the operation of Solid Oxide Cell (SOC) fuel electrodes, the mobility of nickel can lead to significant changes in electrode morphology, with accompanying degradation in electrochemical performance. In this work, the dewetting of nickel films supported on yttriastabilized zirconia (YSZ), hereafter called 2D cells, is studied by coupling in-situ environmentalscanning electron microscopy (E-SEM), image analysis, cellular automata simulation and electrochemical impedance spectroscopy (EIS). Analysis of experimental E-SEM images shows that Ni dewetting causes an increase in active triple phase boundary (aTPB) length up to a maximum, after which a sharp decrease in aTPB occurs due to Ni de-percolation. Thismicrostructural evolution is consistent with the EIS response, which shows a minimum in polarization resistance followed by a rapid electrochemical degradation. These results reveal that neither evaporation-condensation nor surface diffusion of Ni are the main mechanisms of dewetting at 560-800 °C. Rather, the energy barrier for pore nucleation within the dense Ni film appears to be the most important factor. This sheds light on the relevant mechanisms and interfaces that must be controlled to reduce the electrochemical degradation of SOC electrodes induced by Ni dewetting.
AU - Song,B
AU - Bertei,A
AU - Wang,X
AU - Cooper,S
AU - Ruiz-Trejo,E
AU - Chowdhury,R
AU - Podor,R
AU - Brandon,N
DO - 10.1016/j.jpowsour.2019.02.068
EP - 133
PY - 2019///
SN - 0378-7753
SP - 124
TI - Unveiling the mechanisms of solid-state dewetting in Solid Oxide Cells with novel 2D electrodes
T2 - Journal of Power Sources
UR - http://dx.doi.org/10.1016/j.jpowsour.2019.02.068
UR - http://hdl.handle.net/10044/1/67272
VL - 420
ER -