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Spray‐Flame‐Prepared LaCo 1– x Fe x O 3 Perovskite Nanoparticles as Active OER Catalysts: Influence of Fe Content and Low‐Temperature Heating
Author(s) -
Alkan Baris,
Medina Danea,
Landers Joachim,
Heidelmann Markus,
Hagemann Ulrich,
Salamon Soma,
Andronescu Corina,
Wende Heiko,
Schulz Christof,
Schuhmann Wolfgang,
Wiggers Hartmut
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201902051
Subject(s) - perovskite (structure) , crystallinity , stoichiometry , materials science , combustion , oxygen , nanoparticle , catalysis , chemical engineering , particle size , phase (matter) , analytical chemistry (journal) , inorganic chemistry , nanotechnology , chemistry , composite material , organic chemistry , engineering
Spray‐flame synthesis was used to produce high‐surface‐area perovskite electrocatalysts with high phase purity, minimum surface contamination, and high electrochemical stability. In this study, as‐prepared LaCo 1–x Fe x O 3 perovskite nanoparticles (x=0.2, 0.3, and 0.4) were found to contain a high degree of combustion residuals, and mostly consist of both, stoichiometric and oxygen‐deficient perovskite phases. Heating them at moderate temperature (250 °C) in oxygen could remove combustion residuals and increases the content of stoichiometric perovskite while preventing particle growth. A higher surface crystallinity was observed with increasing iron content coming along with a rise in oxygen deficient phases. With heat treatment, OER activity and stability of perovskites improved at 30 and 40 at.% Fe while deteriorating at 20 at.% Fe. This study highlights spray‐flame synthesis as a promising technique to synthesize highly active nanoscale perovskite catalysts with improved OER activity.