TY - GEN
T1 - Dynamic X-ray spectroscopy of La0.6Sr0. 4CoO3-δ thin film electrodes
AU - Gerwe, B. S.
AU - Mizuno, K.
AU - Sekizawa, O.
AU - Nitta, K.
AU - Amezawa, K.
AU - Adler, S. B.
N1 - Funding Information:
The authors would like to thank the National Science Foundation and the Science and Technology Agency for financially supporting this work.
Funding Information:
The authors would like to thank the National Science Foundation and the Japan Science and Technology Agency for financially supporting this work.
Publisher Copyright:
© The Electrochemical Society.
PY - 2019
Y1 - 2019
N2 - Dense thin films of the solid oxide fuel cell cathode material La0.6Sr0.4CoO3-δ were studied by operando X-ray absorption spectroscopy under sinusoidal voltage perturbations. This approach showed good agreement with previous steady-state µ-XAS measurements, but with high effective p(O2) resolution over several orders of magnitude. Co oxidation state varied strongest under a 0.5 Hz perturbation suggesting, in agreement with linear impedance, that oxygen exchange kinetics are most active at this timescale. Furthermore, the local structure around Co atoms response varied at different timescales; however, interpretation was limited with only preliminary analysis. Altogether, this approach was shown as a successful step towards developing a technique sensitive to local chemical state that can also separate processes by timescale.
AB - Dense thin films of the solid oxide fuel cell cathode material La0.6Sr0.4CoO3-δ were studied by operando X-ray absorption spectroscopy under sinusoidal voltage perturbations. This approach showed good agreement with previous steady-state µ-XAS measurements, but with high effective p(O2) resolution over several orders of magnitude. Co oxidation state varied strongest under a 0.5 Hz perturbation suggesting, in agreement with linear impedance, that oxygen exchange kinetics are most active at this timescale. Furthermore, the local structure around Co atoms response varied at different timescales; however, interpretation was limited with only preliminary analysis. Altogether, this approach was shown as a successful step towards developing a technique sensitive to local chemical state that can also separate processes by timescale.
UR - http://www.scopus.com/inward/record.url?scp=85073213860&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073213860&partnerID=8YFLogxK
U2 - 10.1149/09101.1387ecst
DO - 10.1149/09101.1387ecst
M3 - Conference contribution
AN - SCOPUS:85073213860
T3 - ECS Transactions
SP - 1387
EP - 1395
BT - Solid Oxide Fuel Cells 16, SOFC 2019
A2 - Eguchi, K.
A2 - Singhal, S. C.
PB - Electrochemical Society Inc.
T2 - 16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019
Y2 - 8 September 2019 through 13 September 2019
ER -