RAGUPATHY, Pitchai; PARK, Dae-Hoon; CAMPET, Guy; VASAN, H. N.; HWANG, Seong-Ju; CHOY, Jin-Ho; MUNICHANDRAIAH, N.

doi:10.1021/jp811407q

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RAGUPATHY, Pitchai
Solid State and Structural Chemistry Unit [SSCU]

PARK, Dae-Hoon
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CAMPET, Guy
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Physical Chemistry C. 2009, vol. 113, n° 15, p. 6303-6309

American Chemical Society

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Electrochemical capacity retention of nearly X-ray amorphous nanostructured manganese oxide (nanoMnO2) synthesized by mixing directly KMnO4 with ethylene glycol under ambient conditions for supercapacitor studies is enhanced significantly. Although X-ray diffraction (XRD) pattern of nanoMnO2 shows poor crystallinity, it is found that by Mn K-edge X-ray absorption near edge structure (XANES) measurement that the nanoMnO2 obtained is locally arranged in a δ-MnO2-type layered structure composed of edge-shared network of MnO6 octahedra. Field emission scanning electron microscopy and XANES measurements show that nanoMnO2 contains nearly spherical shaped morphology with δ-MnO2 structure, and 1D nanorods of α-MnO2 type structure (powder XRD) in the annealed (600 °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 m2 g−1), porosity of nanoMnO2 (secondary mesopores of diameter 14.5 nm), water content, composition, etc., which lead to the promising electrochemical properties as an electrode for supercapacitor. The nanoMnO2 shows a very high stability even after 1200 cycles with capacity retention of about 250 F g−1.< Réduire

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Remarkable capacity retention of nanostructured manganese oxide upon cycling as an electrode material for supercapacitor

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