Enhancing electrochemical capacitor performance of N-doped tannin-derived carbons by hydrothermal treatment in ammonia - Université de Lorraine Accéder directement au contenu
Article Dans Une Revue Journal of Power Sources Année : 2024

Enhancing electrochemical capacitor performance of N-doped tannin-derived carbons by hydrothermal treatment in ammonia

Résumé

This study demonstrates that ammonia concentration when doping carbons using hydrothermal treatment has crucial impact on textural properties. The latter translates into an improvement of the electrochemical performance of carbon materials, when used into electrochemical capacitors, especially at high-rate performance. Nitrogen-doped carbons were synthesized by subjecting tannin to hydrothermal carbonization in ammonia solutions of varying concentrations. After carbonization and CO2 activation, the as-produced activated carbons (ACs) were tested as electrodes for electrochemical capacitors in symmetric configuration using 1 M H2SO4 as aqueous electrolyte. Interestingly, ammonia concentration during the hydrothermal synthesis step did not significantly affect the final N content (ca. 3 and 4 at. %) nor the nitrogen and oxygen functionalities on the surface. However, the use of ammonia had crucial impact on the textural properties developed by CO2 activation, and therefore on the electrochemical performance of the ACs. The best-performing N-doped AC showed specific electrode capacitance values, based on carbon material, of 212 F·g-1 at 0.5 A·g-1 and outstanding capacitance retention of ca. 71 % at 40 A·g-1. It also showed high cycling stability, with capacitance retention of ca. 96 % after 30,000 cycles. Furthermore, this AC outperformed similar reported materials, achieving a specific energy of 4.6 W·h·kg-1 at 12.1 kW·kg-1.

Domaines

Matériaux
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mardi 24 septembre 2024
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Avant la publication
mardi 24 septembre 2024
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mardi 24 septembre 2024
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Dates et versions

hal-04559743 , version 1 (25-04-2024)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Oscar Pinto-Burgos, Jimena Castro-Gutiérrez, Po Shan Poon, Maria Izquierdo, Alain Celzard, et al.. Enhancing electrochemical capacitor performance of N-doped tannin-derived carbons by hydrothermal treatment in ammonia. Journal of Power Sources, 2024, 602, pp.234332. ⟨10.1016/j.jpowsour.2024.234332⟩. ⟨hal-04559743⟩
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