Oxygen surface exchange kinetics on PrBaCo2O5+δ

C.-Y. Yoo; Bernard A. Boukamp; Henricus J.M. Bouwmeester

doi:10.1016/j.ssi.2013.11.042

Oxygen surface exchange kinetics on PrBaCo2O5+δ

C.-Y. Yoo, Bernard A. Boukamp, Henricus J.M. Bouwmeester

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Abstract

The surface oxygen exchange kinetics on the double perovskite PrBaCo2O5 + δ has been studied using pulse 18O–16O isotope exchange measurements in the temperature range from 300 to 500 °C. The exchange rate, at oxygen partial pressure of 0.21 atm, shows an activation energy of 97 ± 3 kJ mol−1. A two-step exchange mechanism is applied to account for the observed distribution of 16O2, 16O18O, and 18O2 in the effluent pulses. The results indicate that the oxygen exchange kinetics on PrBaCo2O5 + δ is determined by the rates of homolytic oxygen dissociative adsorption on the PrBaCo2O5 + δ surface and incorporation of oxygen adatoms in the oxide lattice. A changeover of the rate-determining step occurs upon increasing pO2 from 0.1 to 0.95 atm.

Original language	English
Pages (from-to)	668-671
Number of pages	4
Journal	Solid state ionics
Volume	262
DOIs	https://doi.org/10.1016/j.ssi.2013.11.042
Publication status	Published - 2014

Keywords

METIS-303772
IR-94158

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10.1016/j.ssi.2013.11.042

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@article{55da3628f02249ac9bd36df0abdd8628,

title = "Oxygen surface exchange kinetics on PrBaCo2O5+δ",

abstract = "The surface oxygen exchange kinetics on the double perovskite PrBaCo2O5 + δ has been studied using pulse 18O–16O isotope exchange measurements in the temperature range from 300 to 500 °C. The exchange rate, at oxygen partial pressure of 0.21 atm, shows an activation energy of 97 ± 3 kJ mol−1. A two-step exchange mechanism is applied to account for the observed distribution of 16O2, 16O18O, and 18O2 in the effluent pulses. The results indicate that the oxygen exchange kinetics on PrBaCo2O5 + δ is determined by the rates of homolytic oxygen dissociative adsorption on the PrBaCo2O5 + δ surface and incorporation of oxygen adatoms in the oxide lattice. A changeover of the rate-determining step occurs upon increasing pO2 from 0.1 to 0.95 atm.",

keywords = "METIS-303772, IR-94158",

author = "C.-Y. Yoo and Boukamp, {Bernard A.} and Bouwmeester, {Henricus J.M.}",

year = "2014",

doi = "10.1016/j.ssi.2013.11.042",

language = "English",

volume = "262",

pages = "668--671",

journal = "Solid state ionics",

issn = "0167-2738",

publisher = "Elsevier",

}

TY - JOUR

T1 - Oxygen surface exchange kinetics on PrBaCo2O5+δ

AU - Yoo, C.-Y.

AU - Boukamp, Bernard A.

AU - Bouwmeester, Henricus J.M.

PY - 2014

Y1 - 2014

N2 - The surface oxygen exchange kinetics on the double perovskite PrBaCo2O5 + δ has been studied using pulse 18O–16O isotope exchange measurements in the temperature range from 300 to 500 °C. The exchange rate, at oxygen partial pressure of 0.21 atm, shows an activation energy of 97 ± 3 kJ mol−1. A two-step exchange mechanism is applied to account for the observed distribution of 16O2, 16O18O, and 18O2 in the effluent pulses. The results indicate that the oxygen exchange kinetics on PrBaCo2O5 + δ is determined by the rates of homolytic oxygen dissociative adsorption on the PrBaCo2O5 + δ surface and incorporation of oxygen adatoms in the oxide lattice. A changeover of the rate-determining step occurs upon increasing pO2 from 0.1 to 0.95 atm.

AB - The surface oxygen exchange kinetics on the double perovskite PrBaCo2O5 + δ has been studied using pulse 18O–16O isotope exchange measurements in the temperature range from 300 to 500 °C. The exchange rate, at oxygen partial pressure of 0.21 atm, shows an activation energy of 97 ± 3 kJ mol−1. A two-step exchange mechanism is applied to account for the observed distribution of 16O2, 16O18O, and 18O2 in the effluent pulses. The results indicate that the oxygen exchange kinetics on PrBaCo2O5 + δ is determined by the rates of homolytic oxygen dissociative adsorption on the PrBaCo2O5 + δ surface and incorporation of oxygen adatoms in the oxide lattice. A changeover of the rate-determining step occurs upon increasing pO2 from 0.1 to 0.95 atm.

KW - METIS-303772

KW - IR-94158

U2 - 10.1016/j.ssi.2013.11.042

DO - 10.1016/j.ssi.2013.11.042

M3 - Article

VL - 262

SP - 668

EP - 671

JO - Solid state ionics

JF - Solid state ionics

SN - 0167-2738

ER -

Oxygen surface exchange kinetics on PrBaCo2O5+δ

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