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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Suslick, Kenneth
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2017Ultrafast Proton Transfer in Polymer Blends Triggered by Shock Wavescitations
- 2015Synthesis of Manganese Oxide Microspheres by Ultrasonic Spray Pyrolysis and Their Application as Supercapacitorscitations
- 2015High surface area iron oxide microspheres via ultrasonic spray pyrolysis of ferritin core analoguescitations
- 2015Composite CaO-based CO2 sorbents synthesized by ultrasonic spray pyrolysiscitations
- 2010A simple and highly sensitive colorimetric detection method for gaseous formaldehydecitations
- 2009Dual templating synthesis of mesoporous titanium nitride microspherescitations
- 2005Sonochemical preparation of hollow nanospheres and hollow nanocrystalscitations
- 2003A Robust Microporous Zinc Porphyrin Framework Solidcitations
- 2002Synthetic hosts by monomolecular imprinting inside dendrimerscitations
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article
Synthesis of Manganese Oxide Microspheres by Ultrasonic Spray Pyrolysis and Their Application as Supercapacitors
Abstract
<p>Manganese oxide (MnO<sub>2</sub>) microspheres are prepared using an ultrasonic spray pyrolysis (USP) process. A mixed solution of potassium permanganate and hydrochloric acid is nebulized into microsized droplets, which are then carried by air flow through a furnace tube. Each microdroplet serves as one microreactor and produces one microsphere. Upon heating, KMnO<sub>4</sub> is decomposed into MnO<sub>2</sub> microspheres; this synthetic process can easily be scaled up. Characterization of the MnO<sub>2</sub> microspheres by scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectra is described. Different morphologies of MnO<sub>2</sub> microspheres can be controlled by tuning the precursor concentrations (and ratios) and furnace temperatures. Microspheres synthesized at 150 °C give amorphous MnO<sub>2</sub> while synthesis at 500 °C yields crystalline α-MnO<sub>2</sub>. The electrochemical properties investigated by cyclic voltammetry give specific capacitance as high as 320 F g<sup>-1</sup>, demonstrating promising properties as supercapacitors. In addition, these microspheres can be directly sprayed on conductive substrates, such as carbon fiber paper, and may have useful applications as a supercapacitor electrode coating. The supercapacitive properties of MnO<sub>2</sub> microspheres at higher charge and discharge rates can be improved by increasing the surface area coverage or coating them with a thin layer of conductive polymer.</p>