Microwave-assisted rapid synthesis of birnessite-type MnO{sub 2} nanoparticles for high performance supercapacitor applications

Journal Article · Sat Nov 14 23:00:00 EST 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.07.023· OSTI ID:22475996

Zhang, Xiong; Miao, Wang; Li, Chen; Sun, Xianzhong; Wang, Kai; Ma, Yanwei

Highlights: • Birnessite-type MnO{sub 2} nanoparticles were prepared by the microwave-assisted reflux. • The microwave reaction duration was only 5 min. • A specific capacitance of 329 F g{sup −1} was obtained for birnessite-type MnO{sub 2}. - Abstract: Birnessite-type MnO{sub 2} nanoparticles have been successfully synthesized by the microwave-assisted reflux as short as 5 min. The microstructure and morphology of the products were characterized by X-ray diffraction, N{sub 2} adsorption–desorption isotherms, scanning electron microscopy, transmission electron microscopy. The electrochemical properties of the as-prepared MnO{sub 2} as an electrode material for supercapacitor were investigated by cyclic voltammetry and galvanostatic charge-discharge measurements in 1 M Na{sub 2}SO{sub 4} electrolyte, and a high specific capacitance of 329 F g{sup −1} was achieved at a current density of 0.2 A g{sup −1}. The specific capacitance retention was 92% after 1000 cycles at 2 A g{sup −1}, suggesting that it is a promising electrode material for supercapacitors.

• OSTI ID: 22475996
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 71; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
CAPACITANCE
CAPACITIVE ENERGY STORAGE EQUIPMENT
CURRENT DENSITY
DESORPTION
ELECTROCHEMISTRY
ELECTROLYTES
ENERGY STORAGE
MANGANESE OXIDES
MICROWAVE RADIATION
NANOPARTICLES
PERFORMANCE
SCANNING ELECTRON MICROSCOPY
SODIUM SULFATES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION