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Remarkable Capacity Retention of Nanostructured Manganese Oxide upon Cycling as an Electrode Material for Supercapacitor

Title
Remarkable Capacity Retention of Nanostructured Manganese Oxide upon Cycling as an Electrode Material for Supercapacitor
Authors
Ragupathy, P.Park, Dae HoonCampet, GuyVasan, H. N.Hwang, Seong-JuChoy, Jin-HoMunichandraiah, N.
Ewha Authors
최진호황성주
SCOPUS Author ID
최진호scopus; 황성주scopus
Issue Date
2009
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY C
ISSN
1932-7447JCR Link
Citation
vol. 113, no. 15, pp. 6303 - 6309
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Electrochemical capacity retention of nearly X-ray amorphous nanostructured manganese oxide (nanoMnO(2)) synthesized by mixing directly KMnO(4) with ethylene glycol under ambient conditions for supercapacitor studies is enhanced significantly. Although X-ray diffraction (XRD) pattern of nanoMnO(2) shows poor crystallinity, it is found that by Mn K-edge X-ray absorption near edge structure (XANES) measurement that the nanoMnO(2) obtained is locally arranged in a delta-MnO(2)-type layered structure composed of edge-shared network of MnO(6) octahedra. Field emission scanning electron microscopy and XANES measurements show that nanoMnO(2) contains nearly spherical shaped morphology with delta-MnO(2) structure, and ID nanorods of alpha-MnO(2) type structure (powder XRD) in the annealed (600 degrees C) sample. Volumetric nitrogen adsorption-desorption isotherms, inductively coupled plasma analysis, and thermal analysis are carried out to obtain physicochemical properties such as surface area (230 m(2) g(-1)), porosity of nanoMnO(2) (secondary mesopores of diameter 14.5 nm), water content, composition, etc., which lead to the promising electrochemical properties as an electrode for supercapacitor. The nanoMnO(2) shows a very high stability even after 1200 cycles with capacity retention of about 250 F g(-1).
DOI
10.1021/jp811407q
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자연과학대학 > 화학·나노과학전공 > Journal papers
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