Physicochemical origins of electrochemical promotion of LSM/YSZ

A complex route provided powders of La 1− x Sr x MnO 3 ( x = 0, 0.15, 0.3 and 0.4) from the thermal decomposition of the chelated nitrate precursors. The catalysts were characterized by XRD, BET, SEM, and temperature-programmed techniques. Electrochemical catalysts based on La 0.7Sr 0.3MnO 3 (LSM) w...

Full description

Saved in:
Bibliographic Details
Published in:Catalysis today 2009-08, Vol.146 (3), p.266-273
Main Authors: Roche, V., Hadjar, A., Deloume, J.P., Pagnier, T., Revel, R., Roux, C., Siebert, E., Vernoux, P.
Format: Article
Language:English
Subjects:
Catalysis
Chemical Sciences
Chemisorption
Chemistry
Electrochemistry
EPOC
Exact sciences and technology
General and physical chemistry
LSM
Material chemistry
NEMCA effect
O 2-TPD
Propane oxidation
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TPO
TPR
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A complex route provided powders of La 1− x Sr x MnO 3 ( x = 0, 0.15, 0.3 and 0.4) from the thermal decomposition of the chelated nitrate precursors. The catalysts were characterized by XRD, BET, SEM, and temperature-programmed techniques. Electrochemical catalysts based on La 0.7Sr 0.3MnO 3 (LSM) were deposited on yttria-stabilized zirconia (YSZ) pellets. Electrochemical characterizations of these samples evidenced two redox processes assigned to the existence of different environments around Mn 4+ in LSM in good agreement with the peaks observed by temperature programmed reduction (TPR). In situ O 2 temperature programmed desorption (O 2-TPD) and temperature programmed oxidation (TPO) of propane were performed on LSM/YSZ to investigate the influence of the polarization on oxygen and propane chemisorption on LSM/YSZ. O 2-TPD experiments have shown that the electrical polarization during adsorption process has no significant impact on gaseous oxygen adsorption on LSM thin film. TPO experiments suggest an increase in the adsorption strength of propane on LSM that could be at the origin of the electrochemical promotion effects observed upon polarization conditions.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2009.03.031