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Remarkable Capacity Retention of Nanostructured Manganese Oxide upon Cycling as an Electrode Material for Supercapacitor
- Remarkable Capacity Retention of Nanostructured Manganese Oxide upon Cycling as an Electrode Material for Supercapacitor
- Ragupathy, P.; Park, Dae Hoon; Campet, Guy; Vasan, H. N.; Hwang, Seong-Ju; Choy, Jin-Ho; Munichandraiah, N.
- Ewha Authors
- 최진호; 황성주
- SCOPUS Author ID
- 최진호; 황성주
- Issue Date
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY C
- vol. 113, no. 15, pp. 6303 - 6309
- AMER CHEMICAL SOC
- SCI; SCIE; SCOPUS
- 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).
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