TY - JOUR
T1 - Combined electrochemical and X-ray tomography study of the high temperature evolution of Nickel - Yttria Stabilized Zirconia solid oxide fuel cell anodes
AU - Kennouche, David
AU - Chen-Wiegart, Yu Chen Karen
AU - Riscoe, Casey
AU - Wang, Jun
AU - Barnett, Scott A.
N1 - Funding Information:
The authors gratefully acknowledge financial support from the Global Climate and Energy Project at Stanford University Project under award 51922 and the National Science Foundation under grant numbers DMR-0907639 and DMR-1506925 . Use of the National Synchrotron Light Source, Brookhaven National Laboratory, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences , under Contract No. DE-AC02-98CH10886 .
Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.
PY - 2016/3/1
Y1 - 2016/3/1
N2 - Accelerated ageing of Ni-Yttria Stabilized Zirconia (YSZ) anode functional layers (AFLs) in solid oxide fuel cells (SOFCs) is carried out at 1000-1200°C, the resulting morphological changes are investigated using transmission X-ray microscopy (TXM), and properties are characterized using electrochemical impedance spectroscopy (EIS). Prior to ageing, the as prepared NiO-YSZ AFLs are reduced to Ni-YSZ and then aged at 1100°C for 100 h in order to eliminate early-stage morphological changes. Measured particle size and three phase boundary (TPB) density changes with ageing time and temperature are fit reasonably well using a power-law coarsening model. This model is also used in conjunction with an electrochemical model to predict changes in the anode charge-transfer polarization resistance. The models are used to make predictions of the structural and electrochemical performance evolution of these Ni-YSZ anodes, for cells operated long-term at normal (700-850°C) operating temperatures. Additional experiments to verify the model predictions are suggested.
AB - Accelerated ageing of Ni-Yttria Stabilized Zirconia (YSZ) anode functional layers (AFLs) in solid oxide fuel cells (SOFCs) is carried out at 1000-1200°C, the resulting morphological changes are investigated using transmission X-ray microscopy (TXM), and properties are characterized using electrochemical impedance spectroscopy (EIS). Prior to ageing, the as prepared NiO-YSZ AFLs are reduced to Ni-YSZ and then aged at 1100°C for 100 h in order to eliminate early-stage morphological changes. Measured particle size and three phase boundary (TPB) density changes with ageing time and temperature are fit reasonably well using a power-law coarsening model. This model is also used in conjunction with an electrochemical model to predict changes in the anode charge-transfer polarization resistance. The models are used to make predictions of the structural and electrochemical performance evolution of these Ni-YSZ anodes, for cells operated long-term at normal (700-850°C) operating temperatures. Additional experiments to verify the model predictions are suggested.
KW - Anode
KW - Model
KW - Polarization resistance
KW - Solid oxide fuel cell
KW - Temperature evolution
KW - Three phase boundaries
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U2 - 10.1016/j.jpowsour.2015.12.126
DO - 10.1016/j.jpowsour.2015.12.126
M3 - Article
AN - SCOPUS:84954289822
SN - 0378-7753
VL - 307
SP - 604
EP - 612
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -
