Transformation from microcrystalline LiMn1-xCrxO 2 to ID nanostructured β-Mn1-xCrxO 2: Promising electrode performance of β-MnO2-type nanowires

Dae Hoon Park, Hyung Wook Ha, Sun Hee Lee, Jin Ho Choy, Seong Ju Hwang

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Cr-substituted β-Mn1-xCrxO2 nanowires with nonaggregated morphology have been synthesized by the chemical oxidation of layered LiMn0.9Cr0.1O2 microcrystals under hydrothermal conditions at elevated temperature. According to powder X-ray diffraction analysis, a persulfate treatment at 200 °C gives rise to a unique transformation from a monoclinic-layered structure to a pyrolusite-(β-MnO2-) type structure. Electron microscopic analyses clearly demonstrated that the oxidized derivative consists of well-separated single-crystalline nanowires with a diameter of ∼30 nm and a length of several micrometers. Mn K-edge and Cr K-edge X-ray absorption spectroscopy and chemical analysis provide straightforward evidence for the substitution of chromium ions for the manganese sites of the pyrolusite-structured manganese oxide nanowires. Of special importance is that the present Cr-substituted β-MnO2-type nanowires show promising electrode performance for Li+ ion batteries, superior to those of pristine LiMn0.9Cr0.1O2, bulk β-MnO 2, and other structure-type manganese oxide nanowires including unsubstituted β-MnO2 nanowires. On the basis of the present experimental findings, we are able to conclude that the persulfate treatment under hydrothermal conditions provides a powerful method not only to prepare cation-substituted manganese oxide nanowires but also to improve the electrode performance of microcrystalline metal oxides through nanostructure fabrication.

Original languageEnglish
Pages (from-to)5160-5164
Number of pages5
JournalJournal of Physical Chemistry C
Volume112
Issue number13
DOIs
Publication statusPublished - 2008 Apr 3

Fingerprint

Nanowires
nanowires
Electrodes
electrodes
Manganese oxide
manganese oxides
Microcrystals
X ray absorption spectroscopy
nanofabrication
microcrystals
Chromium
Manganese
chemical analysis
Oxides
X ray diffraction analysis
metal oxides
electric batteries
Cations
manganese
micrometers

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

@article{063e4871a5a04efd967cc098ea02746c,
title = "Transformation from microcrystalline LiMn1-xCrxO 2 to ID nanostructured β-Mn1-xCrxO 2: Promising electrode performance of β-MnO2-type nanowires",
abstract = "Cr-substituted β-Mn1-xCrxO2 nanowires with nonaggregated morphology have been synthesized by the chemical oxidation of layered LiMn0.9Cr0.1O2 microcrystals under hydrothermal conditions at elevated temperature. According to powder X-ray diffraction analysis, a persulfate treatment at 200 °C gives rise to a unique transformation from a monoclinic-layered structure to a pyrolusite-(β-MnO2-) type structure. Electron microscopic analyses clearly demonstrated that the oxidized derivative consists of well-separated single-crystalline nanowires with a diameter of ∼30 nm and a length of several micrometers. Mn K-edge and Cr K-edge X-ray absorption spectroscopy and chemical analysis provide straightforward evidence for the substitution of chromium ions for the manganese sites of the pyrolusite-structured manganese oxide nanowires. Of special importance is that the present Cr-substituted β-MnO2-type nanowires show promising electrode performance for Li+ ion batteries, superior to those of pristine LiMn0.9Cr0.1O2, bulk β-MnO 2, and other structure-type manganese oxide nanowires including unsubstituted β-MnO2 nanowires. On the basis of the present experimental findings, we are able to conclude that the persulfate treatment under hydrothermal conditions provides a powerful method not only to prepare cation-substituted manganese oxide nanowires but also to improve the electrode performance of microcrystalline metal oxides through nanostructure fabrication.",
author = "Park, {Dae Hoon} and Ha, {Hyung Wook} and Lee, {Sun Hee} and Choy, {Jin Ho} and Hwang, {Seong Ju}",
year = "2008",
month = "4",
day = "3",
doi = "10.1021/jp710579y",
language = "English",
volume = "112",
pages = "5160--5164",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "13",

}

Transformation from microcrystalline LiMn1-xCrxO 2 to ID nanostructured β-Mn1-xCrxO 2 : Promising electrode performance of β-MnO2-type nanowires. / Park, Dae Hoon; Ha, Hyung Wook; Lee, Sun Hee; Choy, Jin Ho; Hwang, Seong Ju.

In: Journal of Physical Chemistry C, Vol. 112, No. 13, 03.04.2008, p. 5160-5164.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Transformation from microcrystalline LiMn1-xCrxO 2 to ID nanostructured β-Mn1-xCrxO 2

T2 - Promising electrode performance of β-MnO2-type nanowires

AU - Park, Dae Hoon

AU - Ha, Hyung Wook

AU - Lee, Sun Hee

AU - Choy, Jin Ho

AU - Hwang, Seong Ju

PY - 2008/4/3

Y1 - 2008/4/3

N2 - Cr-substituted β-Mn1-xCrxO2 nanowires with nonaggregated morphology have been synthesized by the chemical oxidation of layered LiMn0.9Cr0.1O2 microcrystals under hydrothermal conditions at elevated temperature. According to powder X-ray diffraction analysis, a persulfate treatment at 200 °C gives rise to a unique transformation from a monoclinic-layered structure to a pyrolusite-(β-MnO2-) type structure. Electron microscopic analyses clearly demonstrated that the oxidized derivative consists of well-separated single-crystalline nanowires with a diameter of ∼30 nm and a length of several micrometers. Mn K-edge and Cr K-edge X-ray absorption spectroscopy and chemical analysis provide straightforward evidence for the substitution of chromium ions for the manganese sites of the pyrolusite-structured manganese oxide nanowires. Of special importance is that the present Cr-substituted β-MnO2-type nanowires show promising electrode performance for Li+ ion batteries, superior to those of pristine LiMn0.9Cr0.1O2, bulk β-MnO 2, and other structure-type manganese oxide nanowires including unsubstituted β-MnO2 nanowires. On the basis of the present experimental findings, we are able to conclude that the persulfate treatment under hydrothermal conditions provides a powerful method not only to prepare cation-substituted manganese oxide nanowires but also to improve the electrode performance of microcrystalline metal oxides through nanostructure fabrication.

AB - Cr-substituted β-Mn1-xCrxO2 nanowires with nonaggregated morphology have been synthesized by the chemical oxidation of layered LiMn0.9Cr0.1O2 microcrystals under hydrothermal conditions at elevated temperature. According to powder X-ray diffraction analysis, a persulfate treatment at 200 °C gives rise to a unique transformation from a monoclinic-layered structure to a pyrolusite-(β-MnO2-) type structure. Electron microscopic analyses clearly demonstrated that the oxidized derivative consists of well-separated single-crystalline nanowires with a diameter of ∼30 nm and a length of several micrometers. Mn K-edge and Cr K-edge X-ray absorption spectroscopy and chemical analysis provide straightforward evidence for the substitution of chromium ions for the manganese sites of the pyrolusite-structured manganese oxide nanowires. Of special importance is that the present Cr-substituted β-MnO2-type nanowires show promising electrode performance for Li+ ion batteries, superior to those of pristine LiMn0.9Cr0.1O2, bulk β-MnO 2, and other structure-type manganese oxide nanowires including unsubstituted β-MnO2 nanowires. On the basis of the present experimental findings, we are able to conclude that the persulfate treatment under hydrothermal conditions provides a powerful method not only to prepare cation-substituted manganese oxide nanowires but also to improve the electrode performance of microcrystalline metal oxides through nanostructure fabrication.

UR - http://www.scopus.com/inward/record.url?scp=47149100514&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=47149100514&partnerID=8YFLogxK

U2 - 10.1021/jp710579y

DO - 10.1021/jp710579y

M3 - Article

AN - SCOPUS:47149100514

VL - 112

SP - 5160

EP - 5164

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 13

ER -