Significant Lanthanoid Substitution Effect on the Redox Reactivity of the Oxygen-Storage Material BaYMn2O5+δ

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• 作者：Teruki Motohashi ; Makoto Kimura ; Yuji Masubuchi ; Shinichi Kikkawa ; Janine George ; Richard Dronskowski
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：June 28, 2016
• 年：2016
• 卷：28
• 期：12
• 页码：4409-4414
• 全文大小：339K
• 年卷期：0
• ISSN：1520-5002

文摘

The redox characteristics of oxygen storage materials BaLnMnb>2b>Ob>5+δb>, with Ln = La, Nd, Gd, and Y, were investigated employing the reductive water dissolution by the deoxygenated δ = 0 form. The Ln = La, Nd, and Gd compounds were found to show a capability to produce hydrogen gas through the water dissolution at 500 °C, whereas the Ln = Y compound was unreactive to water. It was also revealed that the reactivity obviously depends upon the Ln species: the larger the ionic size of Ln³⁺, the higher reactivity the BaLnMnb>2b>Ob>5.0b> samples exhibit. The experimentally derived thermodynamic parameters of the BaLnMnb>2b>Ob>5+δb> series were compared to those obtained by first-principles calculations.