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Hydrothermal synthesis of microalgae-derived microporous carbons for electrochemical capacitors

AutorSevilla Solís, Marta ; Gu, W.; Falco, C.; Titirici, María-Magdalena; Fuertes Arias, Antonio Benito ; Yushin, G.
Palabras claveCarbon
Energy storage
Hydrothermal carbonization
Fecha de publicación21-may-2014
CitaciónJournal of Power Sources 267: 26-32 (2014)
ResumenN-doped highly microporous carbons have been successfully fabricated from N-rich microalgae by the combination of low-cost hydrothermal carbonization and industry-adopted KOH activation processes. The hydrothermal carbonization process was found to be an essential step for the successful conversion of microalgae into a carbon material. The materials thus synthesized showed BET surface areas in the range ∼1800–2200 m2 g−1 exclusively ascribed to micropores. The carbons showed N contents in the 0.7–2.7 wt.%, owing to the use of N-rich microalgae as a carbon precursor. When tested in symmetric double layer capacitors (occasionally called supercapacitors) based on aqueous LiCl electrolytes, pseudocapacitance was only observable for the sample synthesized at the lowest temperature, 650 °C, which is the one exhibiting the largest amount of N- and O-containing groups. The samples synthesized at 700–750 °C exhibited excellent rate capability (only 20% of capacitance loose at 20 A g−1), with specific capacitances of 170–200 F g−1 at 0.1 A g−1. These materials showed excellent long-term cycling stability under high current densities.
Versión del editorhttp://dx.doi.org/10.1016/j.jpowsour.2014.05.046
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