Oxygen surface exchange kinetics on PrBaCo2O5+δ

被引：22
|
作者：
Yoo, Chung-Yul [1 ]
Boukamp, Bernard A. [1 ]
Bouwmeester, Henny J. M. [1 ]
机构：
[1] Univ Twente, Fac Sci & Technol, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands
来源：
SOLID STATE IONICS | 2014年 / 262卷
关键词：
Double perovskite; PrBaCo2O5+delta; PIE; Oxygen surface exchange; STRUCTURAL-PROPERTIES; ION DIFFUSION; PERMEATION; TRANSPORT;
D O I：
10.1016/j.ssi.2013.11.042
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The surface oxygen exchange kinetics on the double perovskite PrBaCo2O5 + delta has been studied using pulse O-18-O-16 isotope exchange measurements in the temperature range from 300 to 500 degrees 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 O-16(2), (OO)-O-16-O-18, and O-18(2) in the effluent pulses. The results indicate that the oxygen exchange kinetics on PrBaCo2O5 + delta is determined by the rates of homolytic oxygen dissociative adsorption on the PrBaCo2O5 + delta surface and incorporation of oxygen adatoms in the oxide lattice. A changeover of the rate-determining step occurs upon increasing pO(2) from 0.1 to 0.95 atm. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：668 / 671
页数：4
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