| 초록 |
Supercapacitors have suffered from an order of magnitude lower energy density compared to conventional batteries in spite of their high power density. However, a notable improvement in energy density has been achieved through the development of advanced carbon-based nanomaterials. In this study, novel carbon-based microporous nanoplates containing numerous heteroatoms (H-CMNs) were fabricated from regenerated silk fibroin by the carbonization and activation of KOH. The H-CMNs had a high surface area of 2553.3 m2/g, electro-active heteroatoms, 5.1 wt% of nitrogen and 10.7 wt% of oxygen, and good electrical conductivity at 300 K of 1.15 × 104 S/m which is comparable to that in highly doped silicon. Therefore, the H-CMNs exhibited superior electrochemical performance, displaying a specific capacitance of 264 F/g in aqueous electrolytes, a specific energy of 133 Wh/kg, a specific power of 217 kW/kg, and a stable cycle life over 10000 cycles. |
