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Effect of Ba Content on the Activity of La 1‐ x Ba x MnO 3 Towards the Oxygen Reduction Reaction
Author(s) -
GobailleShaw Gael. P. A.,
Celorrio Veronica,
Calvillo Laura,
Morris Louis J.,
Granozzi Gaetano,
Fermín David. J.
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800052
Subject(s) - x ray photoelectron spectroscopy , nanoparticle , materials science , catalysis , ionic liquid , oxide , mesoporous material , oxygen , electrochemistry , inorganic chemistry , chemical engineering , chemistry , nanotechnology , electrode , metallurgy , biochemistry , organic chemistry , engineering
The electrocatalytic activity of La 1‐ x Ba x MnO 3 nanoparticles towards the oxygen reduction reaction (ORR) is investigated as a function of the A‐site composition. Phase‐pure oxide nanoparticles with a diameter in the range of 40 to 70 nm were prepared by using an ionic liquid route and deposited onto mesoporous carbon films. The structure and surface composition of the nanoparticles are probed by XRD, TEM, EDX, and XPS. Electrochemical studies carried out under alkaline conditions show a strong correlation between the activity of La 1‐ x Ba x MnO 3 and the effective number of reducible Mn sites at the catalysts layer. Our analysis demonstrates that, beyond controlling particle size and surface elemental segregation, understanding and controlling Mn coordination at the first atomic layer is crucial for increasing the performance of these materials.