Porously assembled 2D nanosheets of alkali metal manganese oxides with highly reversible pseudocapacitance behaviors

Min Sun Song, Kyung Min Lee, Yu Ri Lee, In Young Kim, Tae Woo Kim, Jayavant Laxman Gunjakar, Seong Ju Hwang

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Porously assembled 2D nanosheets of alkali metal manganese oxides were synthesized via the flocculation of exfoliated MnO2 nanosheets with alkali metal cations. According to X-ray diffraction and electron microscopic analyses, the MnO2 nanosheets were porously restacked with alkali metal cations, resulting in the mesoporous assembly of lamellar crystallites with surface expansion (∼ 50-70 m2 g-1). Mn K-edge X-ray absorption spectroscopy clearly demonstrated that manganese ions in the reassembled materials were stabilized in octahedral symmetry with the mixed oxidation state of Mn3+/Mn4+. The present reassembled manganates showed large capacitances of ∼140-160 F g-1 and excellent cyclability of ∼93-99% up to the 1000th cycle. The electrochemical cycling did not induce notable frustration in the crystal structure of manganate nanosheets, underscoring the high structural stability of the reassembled manganates. This study provided strong evidence for the effectiveness of the exfoliation- reassembling method in enhancing the capacitance performance of layered metal oxides.

Original languageEnglish
Pages (from-to)22134-22140
Number of pages7
JournalJournal of Physical Chemistry C
Volume114
Issue number50
DOIs
Publication statusPublished - 2010 Dec 23

Fingerprint

Alkali Metals
Manganese oxide
manganese oxides
Nanosheets
Alkali metals
alkali metals
metal oxides
capacitance
Cations
cations
manganese ions
cycles
Capacitance
Positive ions
structural stability
frustration
crystallites
X ray absorption spectroscopy
absorption spectroscopy
Flocculation

All Science Journal Classification (ASJC) codes

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

Cite this

Song, Min Sun ; Lee, Kyung Min ; Lee, Yu Ri ; Kim, In Young ; Kim, Tae Woo ; Gunjakar, Jayavant Laxman ; Hwang, Seong Ju. / Porously assembled 2D nanosheets of alkali metal manganese oxides with highly reversible pseudocapacitance behaviors. In: Journal of Physical Chemistry C. 2010 ; Vol. 114, No. 50. pp. 22134-22140.
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Porously assembled 2D nanosheets of alkali metal manganese oxides with highly reversible pseudocapacitance behaviors. / Song, Min Sun; Lee, Kyung Min; Lee, Yu Ri; Kim, In Young; Kim, Tae Woo; Gunjakar, Jayavant Laxman; Hwang, Seong Ju.

In: Journal of Physical Chemistry C, Vol. 114, No. 50, 23.12.2010, p. 22134-22140.

Research output: Contribution to journalArticle

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AU - Song, Min Sun

AU - Lee, Kyung Min

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AU - Gunjakar, Jayavant Laxman

AU - Hwang, Seong Ju

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N2 - Porously assembled 2D nanosheets of alkali metal manganese oxides were synthesized via the flocculation of exfoliated MnO2 nanosheets with alkali metal cations. According to X-ray diffraction and electron microscopic analyses, the MnO2 nanosheets were porously restacked with alkali metal cations, resulting in the mesoporous assembly of lamellar crystallites with surface expansion (∼ 50-70 m2 g-1). Mn K-edge X-ray absorption spectroscopy clearly demonstrated that manganese ions in the reassembled materials were stabilized in octahedral symmetry with the mixed oxidation state of Mn3+/Mn4+. The present reassembled manganates showed large capacitances of ∼140-160 F g-1 and excellent cyclability of ∼93-99% up to the 1000th cycle. The electrochemical cycling did not induce notable frustration in the crystal structure of manganate nanosheets, underscoring the high structural stability of the reassembled manganates. This study provided strong evidence for the effectiveness of the exfoliation- reassembling method in enhancing the capacitance performance of layered metal oxides.

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