Panoscopic alloying of cobalt in CeO2-ZrO2 solid solutions for superior oxygen-storage capacity

Title
Panoscopic alloying of cobalt in CeO2-ZrO2 solid solutions for superior oxygen-storage capacity
Authors
송승학문주호김정훈홍종섭이종호이해원김병국김형철
Keywords
oxygen storage capaciy; panoscopic alloy powder; ceria-zirconia; oxygen evolution; structural irreversibility
Issue Date
2016-07
Publisher
Acta materialia
Citation
VOL 113, 206-212
Abstract
Oxygen processes (reduction and evolution) play a central role in a variety of physical and chemical applications to meet the growing demands for energy and environmental protection. However, the discovery and optimization of such functional materials are great challenges because they are still hampered by material inherencies and thermodynamic limits. Here, we demonstrate the fabrication of a novel material structure via atomistic doping and nanoscale compositing, a panoscopic alloying powder (PAP) of cobalt in a CeO2–ZrO2 solid solution. This novel structure possesses superior oxygen-storage capacity (OSC) and improved structural stability because it retains the best features of both transition-metal oxides and ceria-based ceramics. According to the thermogravimetry and dilatometry measurements of a 10 mol% PAP sample, (Ce0.65Co0.10)Zr0.25O2−δ, at 800 °C under cyclic reduction–oxidation, an OSC of 2312 μmol-O g−1 was successfully obtained with negligible structural change and a linear strain of 1%.
URI
http://pubs.kist.re.kr/handle/201004/58922
ISSN
13596454
Appears in Collections:
KIST Publication > Article
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