TY - JOUR
T1 - Pd-substituted (La,Sr)CrO3-δ-Ce0.9Gd 0.1O2-δ solid oxide fuel cell anodes exhibiting regenerative behavior
AU - Bierschenk, David M.
AU - Potter-Nelson, Elizabeth
AU - Hoel, Cathleen
AU - Liao, Yougui
AU - Marks, Laurence
AU - Poeppelmeier, Kenneth R.
AU - Barnett, Scott A.
N1 - Funding Information:
The authors gratefully acknowledge financial support from the Department of Energy (Award No. DE-FG02-05ER46255). EPN also acknowledges support from the National Science Foundation RET program, while DMB and SAB acknowledge support from the Petroleum Research Fund and NSF grant CBET-0854223. The EXAFS measurements were performed at the Du-Pont-Northwestern-Dow Collaborative Access Team (DND-CAT) located at Sector 5 of the APS. DND-CAT is supported by E.I. Dupont de Nemours & Co., The Dow Chemical Company and the State of Illinois. Use of the APS was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. DMB and CAH thank Dr. Qing Ma for assistance with the EXAFS measurements.
PY - 2011/3/15
Y1 - 2011/3/15
N2 - Composite anodes consisting of Pd-substituted (La,Sr)CrO 3-δ mixed with 50 wt% Ce0.9Gd0.1O 2-δ were tested in La0.9Sr0.1Ga 0.8Mg0.2O3-δ-electrolyte supported fuel cells at 800 °C with humidified H2 fuel. Low anode polarization resistance was observed during the first several hours of operation, explained by the nucleation of Pd nano-particles on perovskite particle surfaces. Anode performance then degraded gradually before stabilizing. Redox cycling repeatedly restored the anodes to their initial peak performance, followed again by degradation. This regenerative behavior was explained by the observation that the Pd nano-particles were removed by oxidation, and then re-nucleated upon reduction.
AB - Composite anodes consisting of Pd-substituted (La,Sr)CrO 3-δ mixed with 50 wt% Ce0.9Gd0.1O 2-δ were tested in La0.9Sr0.1Ga 0.8Mg0.2O3-δ-electrolyte supported fuel cells at 800 °C with humidified H2 fuel. Low anode polarization resistance was observed during the first several hours of operation, explained by the nucleation of Pd nano-particles on perovskite particle surfaces. Anode performance then degraded gradually before stabilizing. Redox cycling repeatedly restored the anodes to their initial peak performance, followed again by degradation. This regenerative behavior was explained by the observation that the Pd nano-particles were removed by oxidation, and then re-nucleated upon reduction.
KW - Catalyst
KW - Oxide anode
KW - Palladium
KW - Perovskite
KW - SOFC
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U2 - 10.1016/j.jpowsour.2010.12.050
DO - 10.1016/j.jpowsour.2010.12.050
M3 - Article
AN - SCOPUS:78751620576
VL - 196
SP - 3089
EP - 3094
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
IS - 6
ER -