RT Journal Article
T1 Cellulose nanocrystal-derived carbon electrodes for sustainable potassium-ion charge storage systems
A1 Ojeda Fernández, Irene
A1 Arenas, Cristian B.
A1 Calle-Gil, Raúl
A1 Ebrahimi-Koodehi, Soheila
A1 Garcia-Gimenez, Daniel
A1 José Torralvo, María
A1 Prado Gonjal, Jesús De La Paz
A1 Carretero-González, Javier
A1 Castillo Martínez, Elisabet
AB 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 ZnCl2 activation in a domestic microwave leads to a micro/mesoporous carbon with high surface area (SBET~1800 m2 g 1). These CNC-derived carbons, if assessed in symmetric supercapacitor C/C cells cycled with 0.5 M K2SO4 aqueous electrolyte, show reversible capacitance values up to 66 F g 1 at current densities of 5 A g 1, 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 1 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 1 under a voltage operation window of 1.8 V in 0.5 M K2SO4. On the other hand, non-activated carbons produced through a 2.25 hour thermal annealing at 900 ◦C, present much lower surface area (SBET~450 m2 g 1), 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 1 cycled at 28 mA g 1 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.
PB Elsevier
SN 2214-9937
YR 2024
FD 2024-03-10
LK https://hdl.handle.net/20.500.14352/103511
UL https://hdl.handle.net/20.500.14352/103511
LA eng
NO Ojeda, I.; Arenas, C. B.; Calle-Gil, R.; Ebrahimi-Koodehi, S.; Garcia-Gimenez, D.; Torralvo, M. J.; Prado-Gonjal, J.; Carretero-González, J.; Castillo-Martínez, E. Cellulose nanocrystal-derived carbon electrodes for sustainable potassium-ion charge storage systems. Sustainable Materials and Technologies 2024, 40, e00932 DOI:10.1016/j.susmat.2024.e00932.
DS Docta Complutense
RD 7 oct 2024