Tunable Oxygen Intake/Release Characteristics of Brownmillerite-Type Ca2AlMnO5+δ Involving Atomic Defect Formations

Autor:	Toyokazu Tanabe, Sayaka Tamura, Teruki Motohashi, Saito Miwa, Iseki Tomohiro
Rok vydání:	2021
Předmět:	Atmosphere Materials science chemistry Kinetics engineering Analytical chemistry Brownmillerite chemistry.chemical_element General Materials Science engineering.material Oxygen Oxygen storage capacity Oxygen pressure
Zdroj:	ACS Applied Materials & Interfaces. 13:53717-53724
ISSN:	1944-8252 1944-8244
Popis:	The oxygen intake/release characteristics were systematically studied for Ca2AlMnO5+δ samples synthesized under precisely controlled oxygen pressures. Both the oxygen storage capacity (OSC) and operating temperature were systematically lowered as the oxygen pressure in the firing atmosphere increased. Notably, the sample fired under a 1% O2 atmosphere exhibited sufficiently large OSC and superior oxygen intake/release kinetics to the pristine sample synthesized in an anaerobic condition. The high-angle annular dark-field scanning TEM observation revealed that the samples contain defects in their atomic arrangement when fired in oxygen-rich atmospheres. This result indicates that the oxygen intake/release characteristics of Ca2AlMnO5+δ are sensitive to the synthesis condition and widely tunable even without chemical substitutions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::047738d853e8091914917d6ccf8cf70c https://doi.org/10.1021/acsami.1c13534 Zobrazit plný text záznamu