TY - JOUR
T1 - Determination of redox-active centers in praseodymium doped ceria by in situ-XANES spectroscopy
AU - Kiebach, Wolff-Ragnar
AU - Chatzichristodoulou, Christodoulos
AU - Werchmeister, Rebecka Maria Larsen
AU - Hagen, Anke
PY - 2012
Y1 - 2012
N2 - Praseodymium doped ceria, a material of interest for electrochemical flue gas purification, was investigated with in situ X-ray Absorption Near Edge Structure spectroscopy between room temperature and 500°C in air and diluted nitrogen(II) oxide (NO/Ar) (1% NO in Ar). For temperatures above 400°C in NO/Ar a reversible energy shift towards lower energy was observed for the Pr edge, indicating a reduction of Pr4+ to Pr3+, while the edge position of Ce remained unchanged. The concentration of Pr3+ ions was quantified and obtained results are in good agreement with predictions from defect thermodynamic modeling.
AB - Praseodymium doped ceria, a material of interest for electrochemical flue gas purification, was investigated with in situ X-ray Absorption Near Edge Structure spectroscopy between room temperature and 500°C in air and diluted nitrogen(II) oxide (NO/Ar) (1% NO in Ar). For temperatures above 400°C in NO/Ar a reversible energy shift towards lower energy was observed for the Pr edge, indicating a reduction of Pr4+ to Pr3+, while the edge position of Ce remained unchanged. The concentration of Pr3+ ions was quantified and obtained results are in good agreement with predictions from defect thermodynamic modeling.
U2 - 10.1016/j.cplett.2012.04.009
DO - 10.1016/j.cplett.2012.04.009
M3 - Journal article
SN - 0009-2614
VL - 537
SP - 80
EP - 83
JO - Chemical Physics Letters
JF - Chemical Physics Letters
ER -