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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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Ghosh, Kalyan
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 20243D printing of MAX/PLA filament: Electrochemical in-situ etching for enhanced energy conversion and storagecitations
- 2023Cathodoluminescence and optical absorption spectroscopy of plasmonic modes in chromium micro-rodscitations
- 2023Heterolayered carbon allotrope architectonics via multi-material 3D printing for advanced electrochemical devicescitations
- 2021Metal-plated 3D-printed electrode for electrochemical detection of carbohydratescitations
- 2018Development of a 3D graphene aerogel and 3D porous graphene/MnO 2 @polyaniline hybrid film for all-solid-state flexible asymmetric supercapacitorscitations
- 2017Development of 3D Urchin-Shaped Coaxial Manganese Dioxide@Polyaniline (MnO2@PANI) Composite and Self-Assembled 3D Pillared Graphene Foam for Asymmetric All-Solid-State Flexible Supercapacitor Applicationcitations
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article
Development of 3D Urchin-Shaped Coaxial Manganese Dioxide@Polyaniline (MnO2@PANI) Composite and Self-Assembled 3D Pillared Graphene Foam for Asymmetric All-Solid-State Flexible Supercapacitor Application
Abstract
We have fabricated high-energy-density all-solid-state flexible asymmetric supercapacitor by using a facile novel 3D hollow urchin-shaped coaxial manganese dioxide@polyaniline (MnO<sub>2</sub>@PANI) composite as positive electrode and 3D graphene foam (GF) as negative electrode materials with polyvinyl alcohol (PVA)/KOH gel electrolyte. The coaxial MnO<sub>2</sub>@PANI composite was fabricated by hydrothermal route followed by oxidation without use of an external oxidant. The formation mechanism of the 3D hollow MnO<sub>2</sub>@PANI composite occurs first by nucleation and growth of the MnO<sub>2</sub> crystal species via dissolution-recrystallization and oriented attachment mechanisms followed by the oxidation of aniline monomers on the MnO<sub>2</sub> crystalline template. The self-assembled 3D graphene block was synthesized by hydrothermal route using vitamin C as a reducing agent. The microstructures of the composites are analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The morphology is characterized by field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), which clearly showed the formation of urchin-shaped coaxial MnO<sub>2</sub>@PANI composite. The electrochemical studies are explored by cyclic voltammetry, electrochemical impedance spectrometry, and cyclic charge-discharge tests. The symmetric all-solid-state flexible MnO<sub>2</sub>@PANI//MnO<sub>2</sub>@PANI and GF//GF supercapacitors exhibit the specific capacitance of 129.2 and 82.1 F g<sup>-1</sup> at 0.5 A/g current density, respectively. The solid-state asymmetric supercapacitor shows higher energy density (37 Wh kg<sup>-1</sup>) with respect to the solid-state symmetric supercapacitors MnO<sub>2</sub>@PANI//MnO<sub>2</sub>@PANI and GF//GF, where the obtained energy density are found to be 17.9 and 11.4 Wh kg<sup>-1</sup>, respectively, at 0.5 A/g current density. Surprisingly, the asymmetric supercapacitor shows a high energy density of 22.3 Wh kg<sup>-1</sup> at a high current density of 5 A g<sup>-1</sup>. The solid-state asymmetric supercapacitor shows a good cyclic stability in which ∼11% capacitance loss was observed after 5000 cycles. © 2017 American Chemical Society.