Misc.

Aug, 2015

Lithium Storage Properties of a Bioinspired 2-Line Ferrihydrite: A Silicon-Doped, Nanometric, and Amorphous Iron'Oxyhydroxide

INORGANIC CHEMISTRY
  • Hideki Hashimoto
  • ,
  • Yuta Nishiyama
  • ,
  • Masahiro Ukita
  • ,
  • Ryo Sakuma
  • ,
  • Makoto Nakanishi
  • ,
  • Tatsuo Fujii
  • ,
  • Jun Takada

Volume
54
Number
15
First page
7593
Last page
7599
Language
English
Publishing type
DOI
10.1021/acs.inorgchem.5b01165
Publisher
AMER CHEMICAL SOC

Inspired by a nanometric iron-based oxide material of bacterial origin, silicon (Si)-doped iron oxyhydroxide nanopartides or 2-line ferrihydrites (2Fhs) were prepared and their lithium (Li) storage properties were investigated. The structures of the Si-doped 2Fhs strongly depended on the Si molar ratio [x = Si/(Fe + Si)] whose longrange atomic ordering gradually vanished as the Si molar ratio increased, with a structural change from nanocrystalline to amorphous at x = 0.30. The most striking properties were observed for the sample with x = 0.30. Over the voltage range of 1.5-4.0 V at a current rate of 500 mA/g, this material exhibited a relatively high reversible capacity of similar to 100 mAh/g, which was four times greater than that of the Si-free 2Fh and indicated a good rate capability and cyclability. The large capacity and good rate and cycle performances are presumably because of the amorphous structure and the strong and stabilizing covalent Si-O bonds, respectively. The minor amount of Si4+ in the structure of the iron oxyhydroxides is considered to improve the electrochemical properties. Use of more appropriate doping elements and fabrication of more appropriate nanostructures could drastically improve the Li storage properties of the developed bioinspired material.

Link information
DOI
https://doi.org/10.1021/acs.inorgchem.5b01165
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000359096400051&DestApp=WOS_CPL
ID information
  • DOI : 10.1021/acs.inorgchem.5b01165
  • ISSN : 0020-1669
  • eISSN : 1520-510X
  • Web of Science ID : WOS:000359096400051

Export
BibTeX RIS