In situ Fe XAFS of reversible lithium insertion in a flexible metal organic framework material

被引：49

作者：

de Combarieu, Guillaume ^{[1
]}

Hamelet, Stephane ^{[1
]}

Millange, Franck ^{[2
]}

Morcrette, Mathieu ^{[1
]}

Tarascon, Jean-Marie ^{[1
]}

Ferey, Gerard ^{[2
]}

Walton, Richard I. ^{[3
]}

机构：

[1] Univ Picardie Jules Verne, CNRS, UMR6007, Lab React & Chim Solide, F-80039 Amiens, France

[2] Univ Versailles St Quentin En Yvelines, CNRS, UMR 8180, Inst Lavoisier, F-78035 Versailles, France

[3] Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands, England

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2009年 / 11卷 / 10期

关键词：

EXAFS; XANES; Recyclable battery; Iron carboxylate; MOF; RAY-ABSORPTION SPECTROSCOPY; EXAFS; IRON;

D O I：

10.1016/j.elecom.2009.08.008

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

X-ray absorption fine structure (XAFS) analysis of the Fe K-edge during lithium insertion and extraction into the metal organic framework material MIL-53 (Fe-III(OH, F)bdc; bdc = benzene-1,4-dicarboxylate) reveals changes in local atomic environment about iron during the process. The average oxidation state of iron is reduced upon lithium insertion, as evidenced by the edge shift of the XANES spectra, and this is accompanied by a lengthening of Fe-O bonds, seen in the EXAFS. In contrast, the EXAFS analysis shows that the closest Fe-Fe distance remains approximately constant during the insertion and extraction of lithium, consistent with a distortion of the structure due to its flexible nature. The process is reversible upon lithium extraction, proving the redox-active flexibility of the framework. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1881 / 1884

页数：4

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