Journal
JOURNAL OF POWER SOURCES
Volume 307, Issue -, Pages 604-612Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.12.126
Keywords
Solid oxide fuel cell; Anode; Temperature evolution; Model; Three phase boundaries; Polarization resistance
Funding
- Global Climate and Energy Project at Stanford University Project [51922]
- National Science Foundation [DMR-0907639, DMR-1506925]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Direct For Mathematical & Physical Scien [1506055] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1506925] Funding Source: National Science Foundation
- Division Of Materials Research [1506055] Funding Source: National Science Foundation
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Accelerated ageing of Ni-Yttria Stabilized Zirconia (YSZ) anode functional layers (AFLs) in solid oxide fuel cells (SOFCs) is carried out at 1000-1200 degrees 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 degrees 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 degrees C) operating temperatures. Additional experiments to verify the model predictions are suggested. (C) 2016 Elsevier B.V. All rights reserved.
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