Striking Oxygen-Release/Storage Properties of Fe-Site-Substituted Sr3Fe2O7-δ

被引：23

作者：

Beppu, Kosuke ^{[1
]}

Hosokawa, Saburo ^{[1
,2
]}

Demizu, Akito ^{[1
]}

Oshino, Yudai ^{[1
]}

Tamai, Kazuki ^{[1
]}

Kato, Kazuo ^{[3
]}

Wada, Kenji ^{[4
]}

Asakura, Hiroyuki ^{[1
,2
]}

Teramura, Kentaro ^{[1
,2
]}

Tanaka, Tsunehiro ^{[1
,2
]}

机构：

[1] Kyoto Univ, Grad Sch Engn, Dept Mol Engn, Nishikyo Ku, Kyoto 6158510, Japan

[2] Kyoto Univ, ESICB, Nishikyo Ku, Kyoto 6158245, Japan

[3] Japan Synchrotron Radiat Res Inst, 1-1 Kouto, Sayo, Hyogo 6795198, Japan

[4] Kagawa Univ, Fac Med, Dept Chem Med, 1750-1 Ikenobe, Miki, Kagawa 7610793, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2018年 / 122卷 / 21期

关键词：

STORAGE CAPACITY; IRON-OXIDE; CHEMISTRY; SHIFTS; ANODE; NI;

D O I：

10.1021/acs.jpcc.7b12754

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The present study explores the oxygen-storage capacity of Sr3Fe2O7-delta doped by other transition metals. Sr3Fe2O7-delta doped with Mn, Co, or Ni exhibited higher oxygen-storage amount and higher oxygen-release/storage rates than Sr3Fe2O7-delta; doping with Mn led to the highest oxygen-release/storage rates. Although reduced Sr-3(Fe0.8Co0.2)(2)O7-delta and Sr-3(Fe0.8Co0.2)(2)O7-delta had disordered coordination states around Fe and the transition-metal dopant, the local structure around the transition metals in the as-synthesized Sr-3(Fe0.8Co0.2)(2)O7-delta was almost kept intact even in the reduced state. These observations reveal that subtle differences in the ordering around transition-metal species before and after lattice-oxygen release significantly affect the oxide ion mobilities in the perovskite structures and also provide guidelines for designing novel oxygen-storage materials.

引用

页码：11186 / 11193

页数：8

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