Abstract
As a burgeoning energy storage equipment, more attention has been paid to sodium ion hybrid super-capacitor (Na-HSC) with large energy/power density and long cycle life. Anode materials with high Na~+ embedding rate are the key for its development. In this work, multi-chamber microspheres with Nb_2O_5 quantum dots (T-Nb_2O_5@YC) were prepared from yeast enriched with Nb~(5+) and by simple hydrothermal-carbonization. Na~+ half-cell and Na-HSC have excellent electrochemical performance. To be specific, Na+ half battery with T-Nb_2O_5@YC delivers up to 195.7 mA h g~(-1) and maintains 84% discharge capacity after 2000 cycles. Moreover, Na-HSC assembled with T-Nb_2O_5@YC as anode has high energy density (62.5 Wh kg~(-1)) and power density (1250 W kg~(-1)).
NSTL
Elsevier