Hydrothermal synthesis of porous K+-containing flower-like delte MnO2 with high specific capacitance
- Author(s): Li Wang 1 and Hui Wang 2
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View affiliations
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Affiliations:
1:
School of Chemistry and Environmental Engineering , Pingdingshan University , Pingdingshan 467000 , People's Republic of China ;
2: College of Chemistry and Chemical Engineering , Northwest Normal University , Lanzhou 730070 , People's Republic of China
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Affiliations:
1:
School of Chemistry and Environmental Engineering , Pingdingshan University , Pingdingshan 467000 , People's Republic of China ;
- Source:
Volume 12, Issue 9,
September
2017,
p.
670 – 674
DOI: 10.1049/mnl.2017.0249 , Online ISSN 1750-0443
In this study, porous K+-containing flower-like delte-MnO2 constructed by numerous thin two-dimensional nanosheets was fabricated by a hydrothermal procedure. Its flower-like morphology was revealed by scanning electron microscopy. The construction units, the ultrathin sheets, were observed from transmission electron microscopy. Its delte-type crystal was characterised via X-ray diffraction. Its porous structure was convinced through N2 adsorption–desorption isotherms. The properties of delte-MnO2 nanoflowers as an active electrode constituent for electrochemical capacitors were examined by cyclic voltammetry and galvanostatic charge–discharge in 1 mol l−1 Na2SO4 electrolyte, and a specific capacitance of 227.2 F g−1 was obtained at a current density of 0.05 A g−1. The obtained delte-MnO2 shows a good long-term stability, suggesting it is a potential electrode material for capacitors.
Inspec keywords: nitrogen; scanning electron microscopy; adsorption; transmission electron microscopy; manganese compounds; nanoporous materials; current density; capacitors; X-ray diffraction; nanofabrication; electrolytes; electrochemical electrodes; liquid phase deposition; capacitance; voltammetry (chemical analysis); desorption; porosity
Other keywords: electrolyte; thin two-dimensional nanosheets; MnO2; galvanostatic charge-discharge; porous structure; N2; scanning electron microscopy; active electrode constituent; delte-type crystal; N2 adsorption-desorption isotherms; transmission electron microscopy; cyclic voltammetry; delte-MnO2 nanoflowers; porous K+-containing flower-like delte MnO2; X-ray diffraction; hydrothermal synthesis; electrochemical capacitors; electrode material; specific capacitance; flower-like morphology; current density; long-term stability
Subjects: Adsorption and desorption kinetics; evaporation and condensation; Powders and porous materials (engineering materials science); Structure of powders and porous materials; Sorption and accommodation coefficients (surface chemistry); Deposition from liquid phases; Capacitors; Electrochemical conversion and storage; Low-dimensional structures: growth, structure and nonelectronic properties; Electrochemical analytical methods; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Deposition from liquid phases (melts and solutions); Nanofabrication using thin film deposition methods; Electrochemistry and electrophoresis
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