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Synthesis and reversible oxidation/reduction behavior of delafossite-type CuCrAlO

Journal of Materials Science, ISSN: 1573-4803, Vol: 52, Issue: 18, Page: 10718-10725
2017
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Article Description

The oxygen storage capacity (OSC) and oxidation–reduction properties of CuCrAlO 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 °C in N atmosphere. The substitution of Al for Cr in CuCrO suppressed OSC and enhanced its stability to heat treatments under cyclic oxidative/reductive atmosphere. Under 5% H/He atmosphere, the delafossite phase was reduced to a mixture containing Cu and a corundum-type CrO 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-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 CuCrAlO delafossite is reversible. These results suggested that the reduction of CuCrAlO is the key step in the reversible oxygen storage/release process.

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