Strong Lanthanoid Substitution Effect on Electrocatalytic Activity of Double-Perovskite-Type BaLnMn2O5 (Ln = Y, Gd, Nd, and La) for Oxygen Reduction Reaction
Strong Lanthanoid Substitution Effect on Electrocatalytic Activity of Double-Perovskite-Type BaLnMn2O5 (Ln = Y, Gd, Nd, and La) for Oxygen Reduction Reaction
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强镧系元素取代对双钙钛矿型 BaLnMn2O5 (Ln = Y、Gd、Nd 和 La) 氧还原反应电催化活性的影响
DOI：
10.1021/acs.jpcc.7b12678
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Habazaki Hiroki
中科院分区：
文献类型：
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作者：
Tsuji Etsushi;Motohashi Teruki;Noda Hiroyuki;Aoki Yoshitaka;Habazaki Hiroki
系统研究了具有层状双钙钛矿结构的BaLnMn2O5系列（Ln = Y，Gd，Nd，La）催化剂在碱性水溶液中的氧还原反应（ORR）活性.的起始ORR电位和参与ORR的电子数被认为是强烈的Ln依赖性：这两个值都显着高于较大的Ln = La和Nd比较小的Ln = Gd和Y，尽管在它们的化学成分和晶体结构的相似性。Ln = La和Nd化合物的增强的ORR活性可能归因于它们对氧物种的更强的亲和力，这与这些化合物的更大储氧能力一致，如在升高的温度下的水溶解反应所揭示的。
The oxygen reduction reaction (ORR) catalytic activity was systematically studied on the BaLnMn2O5series (Ln = Y, Gd, Nd, and La) with a layered double-perovskite-type structure in an alkaline aqueous solution. The onset ORR potential and the number of electrons involved in ORR were found to be strongly Ln-dependent: both values were significantly higher for larger Ln = La and Nd than for smaller Ln = Gd and Y, despite similarities in their chemical compositions and crystal structures. The enhanced ORR activity of the Ln = La and Nd compounds is likely attributed to their stronger affinity to oxygen species, consistent with the greater oxygen storage capability of these compounds, as revealed by the water dissolution reaction at elevated temperatures.