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{Song:2018:10.1016/j.jpowsour.2018.05.075,
author = {Song, B and Ruiz-Trejo, E and Brandon, N},
doi = {10.1016/j.jpowsour.2018.05.075},
journal = {Journal of Power Sources},
pages = {205--211},
title = {Enhanced mechanical stability of Ni-YSZ scaffold demonstrated by nanoindentation and electrochemical impedance spectroscopy},
url = {http://dx.doi.org/10.1016/j.jpowsour.2018.05.075},
volume = {395},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - The electrochemical performance of Ni-YSZ SOFC anodes can quickly degrade during redox cycling. Mechanical damage at interfaces significantly decreases the number of active triple phase boundaries. This study firstly focuses on the sintering temperature impact on YSZ scaffold mechanical properties. The YSZ scaffold sintered at 1200°C exhibited 56% porosity, 28.3GPa elastic modulus and 0.97GPa hardness and was selected for further redox cycling study. The Ni infiltrated YSZ scaffold operated at 550°C had an initial stabilized polarisation resistance equal to 0.62Ωcm2 and only degraded to 2.85Ωcm2 after 15 redox cycles. The active triple phase boundary density was evaluated by FIB-SEM tomography, and degraded from 28.54μm−2 to 19.36μm−2. The YSZ scaffold structure was robust after 15 redox cycles, as there was no observation of the framework fracturing in both SEM and FIB-SEM images, which indicated that the mechanical stability of YSZ scaffold improves the anode stability during redox cycling. Nonetheless, Ni agglomeration could not be prevented within Ni-YSZ scaffolds and this needs further consideration.
AU - Song,B
AU - Ruiz-Trejo,E
AU - Brandon,N
DO - 10.1016/j.jpowsour.2018.05.075
EP - 211
PY - 2018///
SN - 0378-7753
SP - 205
TI - Enhanced mechanical stability of Ni-YSZ scaffold demonstrated by nanoindentation and electrochemical impedance spectroscopy
T2 - Journal of Power Sources
UR - http://dx.doi.org/10.1016/j.jpowsour.2018.05.075
UR - http://hdl.handle.net/10044/1/60309
VL - 395
ER -