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- Navarro Suárez, Adriana, 1983, et al.
(författare)
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Development of asymmetric supercapacitors with titanium carbide-reduced graphene oxide couples as electrodes
- 2018
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Ingår i: Electrochimica Acta. - : Elsevier BV. - 0013-4686. ; 259, s. 752-761
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Tidskriftsartikel (refereegranskat)abstract
- Two-dimensional (2D) nanomaterials have attracted significant interest for supercapacitor applications due to their high surface to volume ratio. Layered 2D materials have the ability to intercalate ions and thus can provide intercalation pseudocapacitance. Properties such as achieving fast ion diffusion kinetics and maximizing the exposure of the electrolyte to the surface of the active material are critical for optimizing the performance of active materials for electrochemical capacitors (i.e. Supercapacitors). In this study, two 2D materials, titanium carbide (Ti 3 C 2 T x ) and reduced graphene oxide (rGO), were used as electrode materials for asymmetric supercapacitors, with the resulting devices achieving high capacitance values and excellent capacitance retention in both aqueous and organic electrolytes. This work demonstrates that Ti 3 C 2 T x is a promising electrode material for flexible and high-performance energy storage devices.
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| 2. |
- Navarro Suárez, Adriana, 1983, et al.
(författare)
-
Temperature effect on the synthesis of lignin-derived carbons for electrochemical energy storage applications
- 2018
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Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753. ; 397, s. 296-306
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Tidskriftsartikel (refereegranskat)abstract
- Herein, we present a detailed study by N2 sorption and Small Angle X-ray Scattering (SAXS) of the carbonization and KOH activation of lignin for its application as active material for electrochemical energy storage. It has been observed that i) the carbonization of lignin above 700 °C leads to a hard carbon with a large amount of bulk (buried) fine structure microporosity and a good performance as Na-ion negative electrode, ii) when KOH activation is done after complete carbonization it is mainly increasing the accessibility of the initial bulk microporosity, leading to a carbon with good performance as symmetric supercapacitor in aqueous electrolyte and iii) when carbonization and KOH activation are done simultaneously, a distinct pore structure is generated with a large amount of mesopores, suitable for symmetric supercapacitor in organic electrolyte. By combining SAXS, which is sensitive to bulk as well as surface porosity, and N2 sorption which probes surface porosity, it has been possible to follow the intricate mechanism of microporosity development. Finally, it is believed that these results can be extrapolated to various biomass based precursors.
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