Synthesis and lithium electrode application of ZnO-ZnFe2O 4 nanocomposites and porously assembled ZnFe2O4 nanoparticles

Myong A. Woo; Tae Woo Kim; In Young Kim; Seong Ju Hwang

doi:10.1016/j.ssi.2010.10.025

Synthesis and lithium electrode application of ZnO-ZnFe₂O ₄ nanocomposites and porously assembled ZnFe₂O₄ nanoparticles

Myong A. Woo, Tae Woo Kim, In Young Kim, Seong Ju Hwang

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

Abstract

The mixed metal oxide nanocomposites composed of spinel ZnFe ₂O₄ and wurzite ZnO phases are prepared by the heat-treatment for Zn,Fe-layered double hydroxide (Zn,Fe-LDH) at elevated temperatures. The following selective etching of ZnO domains from the nanocomposites yields porously assembled ZnFe₂O₄ nanocrystals. The structural transformation from the brucite LDH structure to the spinel and/or wurzite structures was confirmed by X-ray diffraction and X-ray absorption spectroscopy. According to chemical analysis, electron microscopy, and N₂ adsorption-desorption isotherm measurements, not only the chemical composition of the nanocomposites but also the particle size and surface area of the etched ZnFe₂O₄ nanoparticles can be controlled by changing the Fe/Zn ratio in the precursor metal hydroxide. The calcined nanocomposites show promising functionality as negative electrode materials for lithium ion batteries, which is superior to that of uncomposited ZnFe₂O₄ or ZnO phase. The degrading of the electrode performance of the nanocomposites after the selective etching of ZnO component clearly demonstrates the positive effect of nanocomposite formation on the electrochemical activity of metal oxides.

Original language	English
Pages (from-to)	91-97
Number of pages	7
Journal	Solid State Ionics
Volume	182
Issue number	1
DOIs	https://doi.org/10.1016/j.ssi.2010.10.025
State	Published - 3 Feb 2011

Bibliographical note

Funding Information:
This work was supported by the Converging Research Center Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (20090093646), by the General R/D Program of the Daegu Gyeongbuk Institute of Science and Technology (DGIST), and by National Research Foundation of Korea Grant funded by the Korean Government (2010-0001485). The experiments at Pohang Accelerator Laboratory (PAL) were supported in part by MOST and POSTECH.

Keywords

Layered double hydroxide
Lithium ion electrode
Nanocomposites
Phase transformation
Selective etching

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10.1016/j.ssi.2010.10.025

Cite this

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title = "Synthesis and lithium electrode application of ZnO-ZnFe2O 4 nanocomposites and porously assembled ZnFe2O4 nanoparticles",

abstract = "The mixed metal oxide nanocomposites composed of spinel ZnFe 2O4 and wurzite ZnO phases are prepared by the heat-treatment for Zn,Fe-layered double hydroxide (Zn,Fe-LDH) at elevated temperatures. The following selective etching of ZnO domains from the nanocomposites yields porously assembled ZnFe2O4 nanocrystals. The structural transformation from the brucite LDH structure to the spinel and/or wurzite structures was confirmed by X-ray diffraction and X-ray absorption spectroscopy. According to chemical analysis, electron microscopy, and N2 adsorption-desorption isotherm measurements, not only the chemical composition of the nanocomposites but also the particle size and surface area of the etched ZnFe2O4 nanoparticles can be controlled by changing the Fe/Zn ratio in the precursor metal hydroxide. The calcined nanocomposites show promising functionality as negative electrode materials for lithium ion batteries, which is superior to that of uncomposited ZnFe2O4 or ZnO phase. The degrading of the electrode performance of the nanocomposites after the selective etching of ZnO component clearly demonstrates the positive effect of nanocomposite formation on the electrochemical activity of metal oxides.",

keywords = "Layered double hydroxide, Lithium ion electrode, Nanocomposites, Phase transformation, Selective etching",

author = "Woo, {Myong A.} and Kim, {Tae Woo} and Kim, {In Young} and Hwang, {Seong Ju}",

note = "Funding Information: This work was supported by the Converging Research Center Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (20090093646), by the General R/D Program of the Daegu Gyeongbuk Institute of Science and Technology (DGIST), and by National Research Foundation of Korea Grant funded by the Korean Government (2010-0001485). The experiments at Pohang Accelerator Laboratory (PAL) were supported in part by MOST and POSTECH.",

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AU - Hwang, Seong Ju

N1 - Funding Information: This work was supported by the Converging Research Center Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (20090093646), by the General R/D Program of the Daegu Gyeongbuk Institute of Science and Technology (DGIST), and by National Research Foundation of Korea Grant funded by the Korean Government (2010-0001485). The experiments at Pohang Accelerator Laboratory (PAL) were supported in part by MOST and POSTECH.

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N2 - The mixed metal oxide nanocomposites composed of spinel ZnFe 2O4 and wurzite ZnO phases are prepared by the heat-treatment for Zn,Fe-layered double hydroxide (Zn,Fe-LDH) at elevated temperatures. The following selective etching of ZnO domains from the nanocomposites yields porously assembled ZnFe2O4 nanocrystals. The structural transformation from the brucite LDH structure to the spinel and/or wurzite structures was confirmed by X-ray diffraction and X-ray absorption spectroscopy. According to chemical analysis, electron microscopy, and N2 adsorption-desorption isotherm measurements, not only the chemical composition of the nanocomposites but also the particle size and surface area of the etched ZnFe2O4 nanoparticles can be controlled by changing the Fe/Zn ratio in the precursor metal hydroxide. The calcined nanocomposites show promising functionality as negative electrode materials for lithium ion batteries, which is superior to that of uncomposited ZnFe2O4 or ZnO phase. The degrading of the electrode performance of the nanocomposites after the selective etching of ZnO component clearly demonstrates the positive effect of nanocomposite formation on the electrochemical activity of metal oxides.

AB - The mixed metal oxide nanocomposites composed of spinel ZnFe 2O4 and wurzite ZnO phases are prepared by the heat-treatment for Zn,Fe-layered double hydroxide (Zn,Fe-LDH) at elevated temperatures. The following selective etching of ZnO domains from the nanocomposites yields porously assembled ZnFe2O4 nanocrystals. The structural transformation from the brucite LDH structure to the spinel and/or wurzite structures was confirmed by X-ray diffraction and X-ray absorption spectroscopy. According to chemical analysis, electron microscopy, and N2 adsorption-desorption isotherm measurements, not only the chemical composition of the nanocomposites but also the particle size and surface area of the etched ZnFe2O4 nanoparticles can be controlled by changing the Fe/Zn ratio in the precursor metal hydroxide. The calcined nanocomposites show promising functionality as negative electrode materials for lithium ion batteries, which is superior to that of uncomposited ZnFe2O4 or ZnO phase. The degrading of the electrode performance of the nanocomposites after the selective etching of ZnO component clearly demonstrates the positive effect of nanocomposite formation on the electrochemical activity of metal oxides.

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