| 초록 |
Among the various energy storage materials, Prussian blue (PB) has received much attention due to its open framework structure, non-toxicity, and low cost. Through this structure and interstitial sites, the reversible insertion and desertion of sodium ion can happen more easily. To enhance the cyclic stability, PB and graphene oxide composites (PBGO) is synthesized by self-decomposition of the single precursor. The PBGO electrode shows a high specific capacity. Even, at high current density, this electrode has no noticeable capacity decrease. A sodium ion capacitor is fabricated by combination with activated carbon as a negative electrode. This capacitor shows a capacity retention of more than 90% after 5,000 cycles and exhibits both high power and energy density. From this result, it is demonstrated that the PBGO is a promising candidate material for sodium-ion capacitors. |
