2017年9月
Synthesis and reversible oxidation/reduction behavior of delafossite-type CuCr1-xAlxO2
JOURNAL OF MATERIALS SCIENCE
- ,
- ,
- 巻
- 52
- 号
- 18
- 開始ページ
- 10718
- 終了ページ
- 10725
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s10853-017-1263-7
- 出版者・発行元
- SPRINGER
The oxygen storage capacity (OSC) and oxidation-reduction properties of CuCr1-xAlxO2 with the delafossite-type structure were investigated. Solid solutions with the delafossite-type structure were synthesized by a solid-state reaction route at 1100-1150 degrees C in N-2 atmosphere. The substitution of Al3+ for Cr3+ in CuCrO2 suppressed OSC and enhanced its stability to heat treatments under cyclic oxidative/reductive atmosphere. Under 5% H-2/He atmosphere, the delafossite phase was reduced to a mixture containing Cu and a corundum-type Cr2O3 solid solution (x = 0-0.3). In the region with x = 0.5-0.9, metallic Cu and delafossite phase coexisted. Following repetitive reduction by H-2-pulse injection, a transition alumina phase was detected. The transformation between delafossite- and spinel-type structures can occur without significant diffusion of atoms, and therefore, the cyclic oxidation/reduction of CuCr1-xAlxO2 delafossite is reversible. These results suggested that the reduction of CuCr1-xAlxO2 is the key step in the reversible oxygen storage/release process.
- リンク情報
- ID情報
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- DOI : 10.1007/s10853-017-1263-7
- ISSN : 0022-2461
- eISSN : 1573-4803
- Web of Science ID : WOS:000405305400007