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Morphology and size effects on the reduction of silver oxide by hydrogen
Author(s) -
Schimo Gabriela,
Kreuzer Andreas Michael,
Hassel Achim Walter
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431669
Subject(s) - thermogravimetric analysis , hydrogen , differential scanning calorimetry , oxide , reactivity (psychology) , morphology (biology) , chemical engineering , foil method , chemistry , materials science , inorganic chemistry , nanotechnology , organic chemistry , composite material , thermodynamics , medicine , physics , alternative medicine , genetics , pathology , biology , engineering
The dependence of reactivity towards hydrogen on size and morphology was studied for silver oxide Ag 2 O microparticles. Morphological tuning of the microparticles, which appeared in a size range from 340 to 1400 nm, was achieved in a wet‐chemical synthesis approach. Thermogravimetric measurements allowed the determination of onset temperatures and reaction rates for reduction with gaseous hydrogen as reducing agent. The results reveal the high complexity of the Ag 2 O reduction process, on which both the surface to volume ratio as well as the facet dependent activity of the morphologies have great influence. Differential scanning calorimetry was employed to study reduction by hydrogen, desorbing from a hydrogen‐loaded palladium foil, showing great effect of contact area size on the reactivity.