Cellulose nanocrystal-derived carbon electrodes for sustainable potassium-ion charge storage systems
We have here produced carbon electrode materials derived from Crystalline NanoCellulose (CNC) for low-cost potassium-ion based energy storage systems through conventional annealing as well as through a fast and energy efficient microwave assisted carbonization process. A two-step 4-minute synthesis...
| Autores: | , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/361829 |
| Acceso en línea: | http://hdl.handle.net/10261/361829 |
| Access Level: | acceso abierto |
| Palabra clave: | Energy storage Carbon Crystalline nanocellulose CNC Supercapacitor K-ion batteries Hybrid capacitor Asymmetric capacitor Aqueous |
| Sumario: | We have here produced carbon electrode materials derived from Crystalline NanoCellulose (CNC) for low-cost potassium-ion based energy storage systems through conventional annealing as well as through a fast and energy efficient microwave assisted carbonization process. A two-step 4-minute synthesis with ZnCl activation in a domestic microwave leads to a micro/mesoporous carbon with high surface area (S∼1800 m g). These CNC-derived carbons, if assessed in symmetric supercapacitor C/C cells cycled with 0.5 M KSO aqueous electrolyte, show reversible capacitance values up to 66 F g at current densities of 5 A g, retaining 83% of its initial capacitance after 10.000 cycles without any conducting additive. Due to its large electrochemical window of 1.7 V, a competitive energy density for an aqueous system of 20.9 W h kg is achieved. A hybrid aqueous capacitor built with this carbon as negative electrode and coupled with a Prussian White as positive results in cell capacitance values up to 135 F g under a voltage operation window of 1.8 V in 0.5 M KSO. On the other hand, non-activated carbons produced through a 2.25 hour thermal annealing at 900 °C, present much lower surface area (S∼450 m g), most of it due to its high micropore volume. This low external and mesoporous surface area carbon is a competitive anode material for potassium-ion batteries with a reversible capacity of ∼200 mA h g cycled at 28 mA g using 3.9 M KFSI in DME electrolyte (favourably most of it below 1 V vs K/K) in a potassium half-cell with >80% retention in 100 cycles. The present research shows that sustainable CNC derived carbons produced through energy efficient methods are competitive electrode materials in low-cost K based energy storge systems. |
|---|