Oxygen nonstoichiometry in YBaCo4O7+δ:: Large low-temperature oxygen absorption/desorption capability
Oxygen nonstoichiometry in YBaCo4O7+δ:: Large low-temperature oxygen absorption/desorption capability
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DOI：
10.1021/cm0523081
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发表时间：
2006-01-24
影响因子：
8.6
通讯作者：
Fjellvåg, H
中科院分区：
文献类型：
--
作者：
Karppinen, M;Yamauchi, H;Fjellvåg, H
报道了阳离子化学计量比钴氧化物YBaCo4O7在结构上由两种共角CoO4四面体组成的不寻常的吸氧/放氧行为。我们发现YBaCo4O7+Delta在400℃以下的较窄温度范围内吸放氧的速率约为1.5。吸氧/放氧过程是高度可逆的，受温度和氧分压的控制。这种大的低温含氧量可调性在与例如氧存储有关的应用中很有希望。具有相似特性的材料在很大程度上是今天所缺乏的。
An uncommon oxygen absorption/desorption behavior is reported for the cation-stoichiometric cobalt oxide, YBaCo4O7, structurally composed of two kinds of layers of corner-sharing CoO4 tetrahedra. We have found that YBaCo4O7+delta absorbs and desorbs oxygen up to delta approximate to 1.5 in a narrow temperature range below 400 degrees C. The oxygen uptake/release process is highly reversible, being controlled by both temperature and oxygen partial pressure. Such a large low-temperature oxygen-content tunability is of great promise in regard to applications related to, for example, oxygen storage. Materials with similar characteristics are, to a large degree, lacking today.