| People | Locations | Statistics |
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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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Teodoro, Orlando
Universidade Nova de Lisboa
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2023Amorphous carbon thin filmscitations
- 2023The Role of Hydrogen Incorporation into Amorphous Carbon Films in the Change of the Secondary Electron Yieldcitations
- 2020Free-standing N-Graphene as conductive matrix for Ni(OH)2 based supercapacitive electrodescitations
- 2019Nanocomposite thin films based on Au-Ag nanoparticles embedded in a CuO matrix for localized surface plasmon resonance sensingcitations
- 2018Development of Au/CuO nanoplasmonic thin films for sensing applicationscitations
- 2016Surface modifications on as-grown boron doped CVD diamond films induced by the B2O3-ethanol-Ar systemcitations
- 2014Ion-plasma treatment of reed switch contactscitations
- 2013Amorphous Carbon Coatings: Temperature Effect on Secondary Electron Yield (SEY)
- 2013Study of SEY degradation of amorphous carbon coatings
- 2013Increase of secondary electron yield of amorphous carbon coatings under high vacuum conditionscitations
- 2012An upgraded TOF-SIMS VG Ionex IX23LS: Study on the negative secondary ion emission of III-V compound semiconductors with prior neutral cesium depositioncitations
- 2012TOF-SIMS study of cystine and cholesterol stonescitations
- 2009Characterisation of DLC Films Deposited Using Titanium Isopropoxide (TIPOT) at Different Flow Ratescitations
- 2006Characterisation of metal/mould interface on investment casting of γ-TiAlcitations
- 2005Evaluation of y2O3 as front layer of ceramic crucibles for vaccum induction melting of TiAl based alloys
- 2002Anomalous growth of Ba on Ag(111)citations
Places of action
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article
Free-standing N-Graphene as conductive matrix for Ni(OH)2 based supercapacitive electrodes
Abstract
<p>Free-standing N-doped graphene (NG2N1O) sheets with 2.3 at. % of nitrogen and residual oxygen content were synthesized using low-pressure microwave plasma. A composite made with Ni(OH)<sub>2</sub> and NG2N1O was prepared by the hydrothermal route. Physico-chemical characterizations evidenced the formation of crystalline β-phase of Ni(OH)<sub>2</sub> nanoplates interconnected with graphene nanosheets. The electrochemical results of N-graphene electrodes evidenced very good supercapacitive response with a high rate capability of 97%, negligible charge transfer resistance of 0.05 Ω cm<sup>2</sup> and very low time constant of 50 ms. The specific capacity of the Ni(OH)<sub>2</sub> + NG2N1O composite increased 20% compared to Ni(OH)<sub>2</sub> (107 mAh g<sup>−1</sup> vs. 86 mAh g<sup>−1</sup>, respectively) and the rate capability was 75% at current density of 10 A g<sup>−1</sup>, higher than Ni(OH)<sub>2</sub> which retained only 34.4%. The composite showed excellent stability, by retaining 92% of its initial specific capacity after 4000 charge-discharge cycles. Furthermore, electrochemical impedance spectroscopy evidenced that graphene decreased the charge transfer resistance and diffusional contributions while enhancing the capacitive behaviour and the high-frequency response of the electrodes. An asymmetric cell was assembled using activated carbon as negative electrode and the composite as positive electrode. The cell displayed good capacitive response in a potential window of 1.8 V, in aqueous electrolyte, stored a maximum energy density of 38.64 W h kg<sup>−1</sup> at a power density of 450 W kg<sup>−1</sup> and retained 16 W h kg<sup>−1</sup> at a power density of 4.7 kW kg<sup>−1</sup>.</p>